Index: autotests/clipboardupdatertest.cpp
===================================================================
--- autotests/clipboardupdatertest.cpp
+++ autotests/clipboardupdatertest.cpp
@@ -123,7 +123,7 @@
 
     const QString pasteDir = dir.path() + QLatin1String("/pastedir");
     createTestDirectory(pasteDir, NoSymlink);
-    KIO::Job *job = KIO::pasteClipboard(QUrl::fromLocalFile(pasteDir), 0);
+    KIO::Job *job = KIO::pasteClipboard(QUrl::fromLocalFile(pasteDir), nullptr);
     QVERIFY(job->exec());
     QCOMPARE(job->error(), 0);
 }
@@ -145,7 +145,7 @@
 
     const QString pasteDir = dir.path() + QLatin1String("/pastedir");
     createTestDirectory(pasteDir, NoSymlink);
-    KIO::Job *job = KIO::pasteClipboard(QUrl::fromLocalFile(pasteDir), 0);
+    KIO::Job *job = KIO::pasteClipboard(QUrl::fromLocalFile(pasteDir), nullptr);
     QVERIFY(!job);
 }
 
@@ -166,7 +166,7 @@
 
     const QString pasteDir = dir.path() + QLatin1String("/pastedir");
     createTestDirectory(pasteDir, NoSymlink);
-    KIO::Job *job = KIO::pasteClipboard(QUrl::fromLocalFile(pasteDir), 0);
+    KIO::Job *job = KIO::pasteClipboard(QUrl::fromLocalFile(pasteDir), nullptr);
     QVERIFY(!job);
 }
 
Index: autotests/deletejobtest.cpp
===================================================================
--- autotests/deletejobtest.cpp
+++ autotests/deletejobtest.cpp
@@ -57,7 +57,7 @@
 
     /*QBENCHMARK*/ {
         KIO::DeleteJob *job = KIO::del(QUrl::fromLocalFile(tempFile.fileName()), KIO::HideProgressInfo);
-        job->setUiDelegate(0);
+        job->setUiDelegate(nullptr);
 
         QSignalSpy spy(job, SIGNAL(result(KJob*)));
         QVERIFY(spy.isValid());
@@ -87,7 +87,7 @@
 
     /*QBENCHMARK*/ {
         KIO::DeleteJob *job = KIO::del(QUrl::fromLocalFile(tempDir.path()), KIO::HideProgressInfo);
-        job->setUiDelegate(0);
+        job->setUiDelegate(nullptr);
 
         QSignalSpy spy(job, SIGNAL(result(KJob*)));
         QVERIFY(spy.isValid());
Index: autotests/dropjobtest.cpp
===================================================================
--- autotests/dropjobtest.cpp
+++ autotests/dropjobtest.cpp
@@ -54,7 +54,7 @@
     Q_OBJECT
 public:
     JobSpy(KIO::Job *job)
-        : QObject(0),
+        : QObject(nullptr),
           m_spy(job, SIGNAL(result(KJob*))),
           m_error(0)
     {
@@ -155,7 +155,7 @@
         QUrl destUrl = QUrl::fromLocalFile(desktopPath);
         QDropEvent dropEvent(QPoint(10, 10), Qt::CopyAction, &m_mimeData, Qt::LeftButton, Qt::NoModifier);
         KIO::DropJob *job = KIO::drop(&dropEvent, destUrl, KIO::HideProgressInfo);
-        job->setUiDelegate(0);
+        job->setUiDelegate(nullptr);
         QSignalSpy spy(job, SIGNAL(itemCreated(QUrl)));
 
         // Then the application is run with the source file as argument
@@ -213,8 +213,8 @@
         m_mimeData.setUrls(QList<QUrl>() << QUrl::fromLocalFile(srcFile));
         QDropEvent dropEvent(QPoint(10, 10), dropAction, &m_mimeData, Qt::LeftButton, modifiers);
         KIO::DropJob *job = KIO::drop(&dropEvent, destUrl, KIO::HideProgressInfo);
-        job->setUiDelegate(0);
-        job->setUiDelegateExtension(0);
+        job->setUiDelegate(nullptr);
+        job->setUiDelegateExtension(nullptr);
         JobSpy jobSpy(job);
         QSignalSpy copyJobSpy(job, SIGNAL(copyJobStarted(KIO::CopyJob*)));
         QSignalSpy itemCreatedSpy(job, SIGNAL(itemCreated(QUrl)));
@@ -265,7 +265,7 @@
         m_mimeData.setUrls(QList<QUrl>() << QUrl::fromLocalFile(srcFile));
         QDropEvent dropEvent(QPoint(10, 10), dropAction, &m_mimeData, Qt::LeftButton, modifiers);
         KIO::DropJob *job = KIO::drop(&dropEvent, QUrl(QStringLiteral("trash:/")), KIO::HideProgressInfo);
-        job->setUiDelegate(0);
+        job->setUiDelegate(nullptr);
         QSignalSpy copyJobSpy(job, SIGNAL(copyJobStarted(KIO::CopyJob*)));
         QSignalSpy itemCreatedSpy(job, SIGNAL(itemCreated(QUrl)));
 
@@ -308,7 +308,7 @@
         m_mimeData.setUrls(QList<QUrl>() << trashUrl);
         QDropEvent dropEvent(QPoint(10, 10), Qt::CopyAction, &m_mimeData, Qt::LeftButton, Qt::NoModifier);
         KIO::DropJob *job = KIO::drop(&dropEvent, QUrl::fromLocalFile(m_srcDir), KIO::HideProgressInfo);
-        job->setUiDelegate(0);
+        job->setUiDelegate(nullptr);
         QSignalSpy copyJobSpy(job, SIGNAL(copyJobStarted(KIO::CopyJob*)));
         QSignalSpy spy(job, SIGNAL(itemCreated(QUrl)));
 
@@ -340,7 +340,7 @@
         m_mimeData.setUrls(QList<QUrl>() << trashUrl);
         QDropEvent dropEvent(QPoint(10, 10), Qt::CopyAction, &m_mimeData, Qt::LeftButton, Qt::NoModifier);
         KIO::DropJob *job = KIO::drop(&dropEvent, destUrl, KIO::HideProgressInfo);
-        job->setUiDelegate(0);
+        job->setUiDelegate(nullptr);
         QSignalSpy copyJobSpy(job, SIGNAL(copyJobStarted(KIO::CopyJob*)));
         QVERIFY2(job->exec(), qPrintable(job->errorString()));
 
@@ -390,8 +390,8 @@
         QUrl destUrl = QUrl::fromLocalFile(dest);
         QDropEvent dropEvent(QPoint(10, 10), Qt::CopyAction /*unused*/, &m_mimeData, Qt::LeftButton, Qt::NoModifier);
         KIO::DropJob *job = KIO::drop(&dropEvent, destUrl, KIO::HideProgressInfo);
-        job->setUiDelegate(0);
-        job->setUiDelegateExtension(0); // no rename dialog
+        job->setUiDelegate(nullptr);
+        job->setUiDelegateExtension(nullptr); // no rename dialog
         JobSpy jobSpy(job);
         qRegisterMetaType<KFileItemListProperties>();
         QSignalSpy spyShow(job, SIGNAL(popupMenuAboutToShow(KFileItemListProperties)));
@@ -439,7 +439,7 @@
         QAction appAction1(QStringLiteral("action1"), this);
         QAction appAction2(QStringLiteral("action2"), this);
         QList<QAction *> appActions; appActions << &appAction1 << &appAction2;
-        job->setUiDelegate(0);
+        job->setUiDelegate(nullptr);
         job->setApplicationActions(appActions);
         JobSpy jobSpy(job);
 
Index: autotests/fileundomanagertest.cpp
===================================================================
--- autotests/fileundomanagertest.cpp
+++ autotests/fileundomanagertest.cpp
@@ -268,7 +268,7 @@
     QList<QUrl> lst = sourceList();
     const QUrl d = QUrl::fromLocalFile(destdir);
     KIO::CopyJob *job = KIO::copy(lst, d, KIO::HideProgressInfo);
-    job->setUiDelegate(0);
+    job->setUiDelegate(nullptr);
     FileUndoManager::self()->recordCopyJob(job);
 
     QSignalSpy spyUndoAvailable(FileUndoManager::self(), SIGNAL(undoAvailable(bool)));
@@ -324,7 +324,7 @@
     QList<QUrl> lst = sourceList();
     const QUrl d = QUrl::fromLocalFile(destdir);
     KIO::CopyJob *job = KIO::move(lst, d, KIO::HideProgressInfo);
-    job->setUiDelegate(0);
+    job->setUiDelegate(nullptr);
     FileUndoManager::self()->recordCopyJob(job);
 
     bool ok = job->exec();
@@ -367,7 +367,7 @@
     QList<QUrl> lst; lst << QUrl::fromLocalFile(srcSubDir());
     const QUrl d = QUrl::fromLocalFile(destdir);
     KIO::CopyJob *job = KIO::copy(lst, d, KIO::HideProgressInfo);
-    job->setUiDelegate(0);
+    job->setUiDelegate(nullptr);
     FileUndoManager::self()->recordCopyJob(job);
 
     bool ok = job->exec();
@@ -388,7 +388,7 @@
     QList<QUrl> lst; lst << QUrl::fromLocalFile(srcSubDir());
     const QUrl d = QUrl::fromLocalFile(destdir);
     KIO::CopyJob *job = KIO::move(lst, d, KIO::HideProgressInfo);
-    job->setUiDelegate(0);
+    job->setUiDelegate(nullptr);
     FileUndoManager::self()->recordCopyJob(job);
 
     bool ok = job->exec();
@@ -412,7 +412,7 @@
     QSignalSpy spyUndoAvailable(FileUndoManager::self(), SIGNAL(undoAvailable(bool)));
     QVERIFY(spyUndoAvailable.isValid());
     KIO::Job *job = KIO::moveAs(oldUrl, newUrl, KIO::HideProgressInfo);
-    job->setUiDelegate(0);
+    job->setUiDelegate(nullptr);
     FileUndoManager::self()->recordJob(FileUndoManager::Rename, lst, newUrl, job);
 
     bool ok = job->exec();
@@ -435,7 +435,7 @@
     QList<QUrl> lst;
     lst.append(oldUrl);
     KIO::Job *job = KIO::moveAs(oldUrl, newUrl, KIO::HideProgressInfo);
-    job->setUiDelegate(0);
+    job->setUiDelegate(nullptr);
     FileUndoManager::self()->recordJob(FileUndoManager::Rename, lst, newUrl, job);
 
     bool ok = job->exec();
@@ -465,7 +465,7 @@
     QVERIFY(QFile::exists(targetPath));
 
     KIO::CopyJob *job = KIO::link(target, link);
-    job->setUiDelegate(0);
+    job->setUiDelegate(nullptr);
     FileUndoManager::self()->recordCopyJob(job);
     bool ok = job->exec();
     QVERIFY(ok);
@@ -485,7 +485,7 @@
     QVERIFY(!QFile::exists(path));
 
     KIO::SimpleJob *job = KIO::mkdir(url);
-    job->setUiDelegate(0);
+    job->setUiDelegate(nullptr);
     FileUndoManager::self()->recordJob(FileUndoManager::Mkdir, QList<QUrl>(), url, job);
     bool ok = job->exec();
     QVERIFY(ok);
@@ -515,7 +515,7 @@
     const QUrl url = QUrl::fromLocalFile(path);
 
     KIO::Job *job = KIO::mkpath(url);
-    job->setUiDelegate(0);
+    job->setUiDelegate(nullptr);
     FileUndoManager::self()->recordJob(FileUndoManager::Mkpath, QList<QUrl>(), url, job);
     QVERIFY(job->exec());
     QVERIFY(QFileInfo(path).isDir());
@@ -542,7 +542,7 @@
     QList<QUrl> lst = sourceList();
     lst.append(QUrl::fromLocalFile(srcSubDir()));
     KIO::Job *job = KIO::trash(lst, KIO::HideProgressInfo);
-    job->setUiDelegate(0);
+    job->setUiDelegate(nullptr);
     FileUndoManager::self()->recordJob(FileUndoManager::Trash, lst, QUrl(QStringLiteral("trash:/")), job);
 
     bool ok = job->exec();
@@ -583,7 +583,7 @@
     QList<QUrl> lst = sourceList();
     lst.append(QUrl::fromLocalFile(srcSubDir()));
     KIO::Job *job = KIO::trash(lst, KIO::HideProgressInfo);
-    job->setUiDelegate(0);
+    job->setUiDelegate(nullptr);
     QVERIFY(job->exec());
 
     const QMap<QString, QString> metaData = job->metaData();
@@ -598,7 +598,7 @@
 
     // Restore from trash
     KIO::RestoreJob *restoreJob = KIO::restoreFromTrash(trashUrls, KIO::HideProgressInfo);
-    restoreJob->setUiDelegate(0);
+    restoreJob->setUiDelegate(nullptr);
     QVERIFY(restoreJob->exec());
 
     QVERIFY(QFile::exists(srcFile()));
@@ -617,7 +617,7 @@
     // Put timestamp in the past so that we can check that the
     // copy actually preserves it.
     struct timeval tp;
-    gettimeofday(&tp, 0);
+    gettimeofday(&tp, nullptr);
     struct utimbuf utbuf;
     utbuf.actime = tp.tv_sec + 30; // 30 seconds in the future
     utbuf.modtime = tp.tv_sec + 60; // 60 second in the future
@@ -633,7 +633,7 @@
     QList<QUrl> lst; lst << QUrl::fromLocalFile(srcSubDir());
     const QUrl d = QUrl::fromLocalFile(destdir);
     KIO::CopyJob *job = KIO::copy(lst, d, KIO::HideProgressInfo);
-    job->setUiDelegate(0);
+    job->setUiDelegate(nullptr);
     FileUndoManager::self()->recordCopyJob(job);
 
     bool ok = job->exec();
Index: autotests/http/httpauthenticationtest.cpp
===================================================================
--- autotests/http/httpauthenticationtest.cpp
+++ autotests/http/httpauthenticationtest.cpp
@@ -196,7 +196,7 @@
     QFETCH(QByteArray, expectedOffer);
 
     QByteArray scheme, offer;
-    parseAuthHeader(input, &offer, &scheme, 0);
+    parseAuthHeader(input, &offer, &scheme, nullptr);
     QCOMPARE(scheme, expectedScheme);
     QCOMPARE(offer, expectedOffer);
 }
@@ -265,7 +265,7 @@
     QFETCH(QByteArray, cnonce);
 
     QByteArray bestOffer;
-    parseAuthHeader(input, &bestOffer, 0, 0);
+    parseAuthHeader(input, &bestOffer, nullptr, nullptr);
     KAbstractHttpAuthentication *authObj = KAbstractHttpAuthentication::newAuth(bestOffer);
     QVERIFY(authObj);
     if (!cnonce.isEmpty()) {
@@ -286,7 +286,7 @@
     QString target("TST");
 
     QByteArray bestOffer;
-    parseAuthHeader(input, &bestOffer, 0, 0);
+    parseAuthHeader(input, &bestOffer, nullptr, nullptr);
     KConfig conf;
     KConfigGroup confGroup = conf.group("test");
     confGroup.writeEntry("EnableNTLMv2Auth", true);
Index: autotests/http_jobtest.cpp
===================================================================
--- autotests/http_jobtest.cpp
+++ autotests/http_jobtest.cpp
@@ -53,7 +53,7 @@
     static const char response[] = "Hello world";
     HttpServerThread server(response, HttpServerThread::Public);
     KIO::StoredTransferJob *job = KIO::storedGet(QUrl(server.endPoint()));
-    job->setUiDelegate(0);
+    job->setUiDelegate(nullptr);
     QVERIFY(job->exec());
     QCOMPARE(QString::fromLatin1(job->data()), QString::fromLatin1(response));
 }
@@ -66,7 +66,7 @@
 
     // First we get an error page
     KIO::StoredTransferJob *job = KIO::storedGet(QUrl(server.endPoint()));
-    job->setUiDelegate(0);
+    job->setUiDelegate(nullptr);
     QVERIFY(job->exec());
     QCOMPARE(QString::fromLatin1(job->data()), QString::fromLatin1(response));
     QVERIFY(job->isErrorPage());
@@ -74,7 +74,7 @@
 
     // Second we disable error page, and get the actual job error
     job = KIO::storedGet(QUrl(server.endPoint()));
-    job->setUiDelegate(0);
+    job->setUiDelegate(nullptr);
     job->addMetaData(QStringLiteral("errorPage"), QStringLiteral("false")); // maybe this should be a proper setter...
     QVERIFY(!job->exec());
     QVERIFY(!job->isErrorPage());
@@ -85,7 +85,7 @@
     server.setFeatures(HttpServerThread::Public);
     server.setContentType("");
     job = KIO::storedGet(QUrl(server.endPoint()));
-    job->setUiDelegate(0);
+    job->setUiDelegate(nullptr);
     QSignalSpy mimeTypeSpy(job, SIGNAL(mimetype(KIO::Job*,QString)));
     QVERIFY(job->exec());
     QCOMPARE(job->error(), 0);
@@ -99,7 +99,7 @@
     HttpServerThread server(response, HttpServerThread::Public);
     // Add a trailing slash to ensure kio_http doesn't confuse QMimeDatabase with it.
     KIO::StoredTransferJob *job = KIO::storedGet(QUrl(server.endPoint() + '/'));
-    job->setUiDelegate(0);
+    job->setUiDelegate(nullptr);
     QSignalSpy mimeTypeSpy(job, SIGNAL(mimetype(KIO::Job*,QString)));
     QVERIFY(job->exec());
     QCOMPARE(job->error(), 0);
Index: autotests/httpserver_p.h
===================================================================
--- autotests/httpserver_p.h
+++ autotests/httpserver_p.h
@@ -142,13 +142,13 @@
 {
     Q_OBJECT
 public:
-    BlockingHttpServer(bool ssl) : doSsl(ssl), sslSocket(0) {}
+    BlockingHttpServer(bool ssl) : doSsl(ssl), sslSocket(nullptr) {}
     ~BlockingHttpServer() {}
 
     QTcpSocket *waitForNextConnectionSocket()
     {
         if (!waitForNewConnection(20000)) { // 2000 would be enough, except in valgrind
-            return 0;
+            return nullptr;
         }
         if (doSsl) {
             Q_ASSERT(sslSocket);
Index: autotests/jobguitest.cpp
===================================================================
--- autotests/jobguitest.cpp
+++ autotests/jobguitest.cpp
@@ -73,8 +73,8 @@
         mimeData->setUrls(QList<QUrl>() << fileUrl);
         QApplication::clipboard()->setMimeData(mimeData);
 
-        KIO::Job *job = KIO::pasteClipboard(QUrl::fromLocalFile(otherTmpDir()), static_cast<QWidget *>(0));
-        job->setUiDelegate(0);
+        KIO::Job *job = KIO::pasteClipboard(QUrl::fromLocalFile(otherTmpDir()), static_cast<QWidget *>(nullptr));
+        job->setUiDelegate(nullptr);
         bool ok = job->exec();
         QVERIFY(ok);
 
@@ -86,7 +86,7 @@
     static void delDir(const QString &pathOrUrl)
     {
         KIO::Job *job = KIO::del(QUrl::fromLocalFile(pathOrUrl), KIO::HideProgressInfo);
-        job->setUiDelegate(0);
+        job->setUiDelegate(nullptr);
         job->exec();
     }
 
Index: autotests/jobremotetest.cpp
===================================================================
--- autotests/jobremotetest.cpp
+++ autotests/jobremotetest.cpp
@@ -70,14 +70,14 @@
 static bool myExists(const QUrl &url)
 {
     KIO::Job *job = KIO::stat(url, KIO::StatJob::DestinationSide, 0, KIO::HideProgressInfo);
-    job->setUiDelegate(0);
+    job->setUiDelegate(nullptr);
     return job->exec();
 }
 
 static bool myMkdir(const QUrl &url)
 {
     KIO::Job *job = KIO::mkdir(url, -1);
-    job->setUiDelegate(0);
+    job->setUiDelegate(nullptr);
     return job->exec();
 }
 
@@ -108,7 +108,7 @@
 static void delDir(const QUrl &pathOrUrl)
 {
     KIO::Job *job = KIO::del(pathOrUrl, KIO::HideProgressInfo);
-    job->setUiDelegate(0);
+    job->setUiDelegate(nullptr);
     job->exec();
 }
 
@@ -136,7 +136,7 @@
     QDateTime mtime = QDateTime::currentDateTime().addSecs(-30);   // 30 seconds ago
     mtime.setTime_t(mtime.toTime_t()); // hack for losing the milliseconds
     job->setModificationTime(mtime);
-    job->setUiDelegate(0);
+    job->setUiDelegate(nullptr);
     connect(job, SIGNAL(result(KJob*)),
             this, SLOT(slotResult(KJob*)));
     connect(job, SIGNAL(dataReq(KIO::Job*,QByteArray&)),
@@ -149,7 +149,7 @@
     m_result = -1;
 
     KIO::StoredTransferJob *getJob = KIO::storedGet(u, KIO::NoReload, KIO::HideProgressInfo);
-    getJob->setUiDelegate(0);
+    getJob->setUiDelegate(nullptr);
     connect(getJob, SIGNAL(result(KJob*)),
             this, SLOT(slotGetResult(KJob*)));
     enterLoop();
@@ -197,7 +197,7 @@
     u.setPath(u.path() + "openFileWriting");
     fileJob = KIO::open(u, QIODevice::WriteOnly);
 
-    fileJob->setUiDelegate(0);
+    fileJob->setUiDelegate(nullptr);
     connect(fileJob, SIGNAL(result(KJob*)),
             this, SLOT(slotResult(KJob*)));
     connect(fileJob, SIGNAL(data(KIO::Job*,QByteArray)),
@@ -217,7 +217,7 @@
     QVERIFY(m_result == 0);   // no error
 
     KIO::StoredTransferJob *getJob = KIO::storedGet(u, KIO::NoReload, KIO::HideProgressInfo);
-    getJob->setUiDelegate(0);
+    getJob->setUiDelegate(nullptr);
     connect(getJob, SIGNAL(result(KJob*)),
             this, SLOT(slotGetResult(KJob*)));
     enterLoop();
@@ -295,7 +295,7 @@
     QDateTime mtime = QDateTime::currentDateTime().addSecs(-30);   // 30 seconds ago
     mtime.setTime_t(mtime.toTime_t()); // hack for losing the milliseconds
     putJob->setModificationTime(mtime);
-    putJob->setUiDelegate(0);
+    putJob->setUiDelegate(nullptr);
     connect(putJob, SIGNAL(result(KJob*)),
             this, SLOT(slotResult(KJob*)));
     m_result = -1;
@@ -307,7 +307,7 @@
 
     fileJob = KIO::open(u, QIODevice::ReadOnly);
 
-    fileJob->setUiDelegate(0);
+    fileJob->setUiDelegate(nullptr);
     connect(fileJob, SIGNAL(result(KJob*)),
             this, SLOT(slotResult(KJob*)));
     connect(fileJob, SIGNAL(data(KIO::Job*,QByteArray)),
@@ -383,7 +383,7 @@
 
 void JobRemoteTest::slotMimetype(KIO::Job *job, const QString &type)
 {
-    QVERIFY(job != 0);
+    QVERIFY(job != nullptr);
     m_mimetype = type;
 }
 
Index: autotests/jobtest.cpp
===================================================================
--- autotests/jobtest.cpp
+++ autotests/jobtest.cpp
@@ -141,7 +141,7 @@
     KIO::StoredTransferJob *job = KIO::storedGet(u, KIO::NoReload, KIO::HideProgressInfo);
     QSignalSpy spyPercent(job, SIGNAL(percent(KJob*,ulong)));
     QVERIFY(spyPercent.isValid());
-    job->setUiDelegate(0);
+    job->setUiDelegate(nullptr);
     connect(job, SIGNAL(result(KJob*)),
             this, SLOT(slotGetResult(KJob*)));
     enterLoop();
@@ -166,7 +166,7 @@
     QDateTime mtime = QDateTime::currentDateTime().addSecs(-30);   // 30 seconds ago
     mtime.setTime_t(mtime.toTime_t()); // hack for losing the milliseconds
     job->setModificationTime(mtime);
-    job->setUiDelegate(0);
+    job->setUiDelegate(nullptr);
     connect(job, SIGNAL(result(KJob*)),
             this, SLOT(slotResult(KJob*)));
     connect(job, SIGNAL(dataReq(KIO::Job*,QByteArray&)),
@@ -216,7 +216,7 @@
     QDateTime mtime = QDateTime::currentDateTime().addSecs(-30);   // 30 seconds ago
     mtime.setTime_t(mtime.toTime_t()); // hack for losing the milliseconds
     job->setModificationTime(mtime);
-    job->setUiDelegate(0);
+    job->setUiDelegate(nullptr);
     QVERIFY(job->exec());
     QFileInfo fileInfo(filePath);
     QVERIFY(fileInfo.exists());
@@ -238,7 +238,7 @@
     QDateTime mtime = QDateTime::currentDateTime().addSecs(-30);   // 30 seconds ago
     mtime.setTime_t(mtime.toTime_t()); // hack for losing the milliseconds
     job->setModificationTime(mtime);
-    job->setUiDelegate(0);
+    job->setUiDelegate(nullptr);
     QVERIFY(job->exec());
     QFileInfo fileInfo(filePath);
     QVERIFY(fileInfo.exists());
@@ -312,7 +312,7 @@
     mtime.setTime_t(mtime.toTime_t()); // hack for losing the milliseconds
     job->setModificationTime(mtime);
     job->setTotalSize(putDataContents.size());
-    job->setUiDelegate(0);
+    job->setUiDelegate(nullptr);
     job->setAsyncDataEnabled(true);
 
     QTimer t;
@@ -347,7 +347,7 @@
     const int perms = 0666;
     // copy the file with file_copy
     KIO::Job *job = KIO::file_copy(u, d, perms, KIO::HideProgressInfo);
-    job->setUiDelegate(0);
+    job->setUiDelegate(nullptr);
     bool ok = job->exec();
     QVERIFY(ok);
     QVERIFY(QFile::exists(dest));
@@ -373,8 +373,8 @@
     QFile::remove(dest);
     job = KIO::copy(u, d, KIO::HideProgressInfo);
     QSignalSpy spyCopyingDone(job, SIGNAL(copyingDone(KIO::Job*,QUrl,QUrl,QDateTime,bool,bool)));
-    job->setUiDelegate(0);
-    job->setUiDelegateExtension(0);
+    job->setUiDelegate(nullptr);
+    job->setUiDelegateExtension(nullptr);
     ok = job->exec();
     QVERIFY(ok);
     QVERIFY(QFile::exists(dest));
@@ -396,24 +396,24 @@
     // cleanup and retry with KIO::copyAs()
     QFile::remove(dest);
     job = KIO::copyAs(u, d, KIO::HideProgressInfo);
-    job->setUiDelegate(0);
-    job->setUiDelegateExtension(0);
+    job->setUiDelegate(nullptr);
+    job->setUiDelegateExtension(nullptr);
     QVERIFY(job->exec());
     QVERIFY(QFile::exists(dest));
     QVERIFY(QFile::exists(src));     // still there
 
     // Do it again, with Overwrite.
     job = KIO::copyAs(u, d, KIO::Overwrite | KIO::HideProgressInfo);
-    job->setUiDelegate(0);
-    job->setUiDelegateExtension(0);
+    job->setUiDelegate(nullptr);
+    job->setUiDelegateExtension(nullptr);
     QVERIFY(job->exec());
     QVERIFY(QFile::exists(dest));
     QVERIFY(QFile::exists(src));     // still there
 
     // Do it again, without Overwrite (should fail).
     job = KIO::copyAs(u, d, KIO::HideProgressInfo);
-    job->setUiDelegate(0);
-    job->setUiDelegateExtension(0);
+    job->setUiDelegate(nullptr);
+    job->setUiDelegateExtension(nullptr);
     QVERIFY(!job->exec());
 
     // Clean up
@@ -434,8 +434,8 @@
     }
 
     KIO::Job *job = KIO::copy(u, d, KIO::HideProgressInfo);
-    job->setUiDelegate(0);
-    job->setUiDelegateExtension(0);
+    job->setUiDelegate(nullptr);
+    job->setUiDelegateExtension(nullptr);
     bool ok = job->exec();
     QVERIFY(ok);
     QVERIFY(QFile::exists(dest));
@@ -461,15 +461,15 @@
     // Do it again, with Overwrite.
     // Use copyAs, we don't want a subdir inside d.
     job = KIO::copyAs(u, d, KIO::HideProgressInfo | KIO::Overwrite);
-    job->setUiDelegate(0);
-    job->setUiDelegateExtension(0);
+    job->setUiDelegate(nullptr);
+    job->setUiDelegateExtension(nullptr);
     ok = job->exec();
     QVERIFY(ok);
 
     // Do it again, without Overwrite (should fail).
     job = KIO::copyAs(u, d, KIO::HideProgressInfo);
-    job->setUiDelegate(0);
-    job->setUiDelegateExtension(0);
+    job->setUiDelegate(nullptr);
+    job->setUiDelegateExtension(nullptr);
     ok = job->exec();
     QVERIFY(!ok);
 }
@@ -495,8 +495,8 @@
 
     // copy the symlink
     KIO::Job *job = KIO::copy(u, d, KIO::HideProgressInfo);
-    job->setUiDelegate(0);
-    job->setUiDelegateExtension(0);
+    job->setUiDelegate(nullptr);
+    job->setUiDelegateExtension(nullptr);
     QVERIFY2(job->exec(), qPrintable(job->error()));
     QVERIFY(QT_LSTAT(QFile::encodeName(dest).constData(), &buf) == 0); // dest exists
     QCOMPARE(linkTarget(dest), expectedLinkTarget);
@@ -598,17 +598,17 @@
     KIO::CopyJob *job = KIO::copy(QUrl::fromLocalFile(src_dir), QUrl::fromLocalFile(dst_dir), KIO::HideProgressInfo);
 
     QSignalSpy spy(job, SIGNAL(warning(KJob*,QString,QString)));
-    job->setUiDelegate(0);   // no skip dialog, thanks
+    job->setUiDelegate(nullptr);   // no skip dialog, thanks
     QVERIFY(job->exec());
 
     QFile(inaccessible).setPermissions(QFile::Permissions(QFile::ReadOwner | QFile::WriteOwner | QFile::ExeOwner));
 
     KIO::DeleteJob *deljob1 = KIO::del(QUrl::fromLocalFile(src_dir), KIO::HideProgressInfo);
-    deljob1->setUiDelegate(0); // no skip dialog, thanks
+    deljob1->setUiDelegate(nullptr); // no skip dialog, thanks
     QVERIFY(deljob1->exec());
 
     KIO::DeleteJob *deljob2 = KIO::del(QUrl::fromLocalFile(dst_dir), KIO::HideProgressInfo);
-    deljob2->setUiDelegate(0); // no skip dialog, thanks
+    deljob2->setUiDelegate(nullptr); // no skip dialog, thanks
     QVERIFY(deljob2->exec());
 
     QCOMPARE(spy.count(), 1); // one warning should be emitted by the copy job
@@ -624,8 +624,8 @@
     const QUrl d = QUrl::fromLocalFile(dest);
     KIO::Job *job = KIO::file_copy(u, d, KIO::HideProgressInfo);
     QSignalSpy spyResult(job, SIGNAL(result(KJob*)));
-    job->setUiDelegate(0);
-    job->setUiDelegateExtension(0);
+    job->setUiDelegate(nullptr);
+    job->setUiDelegateExtension(nullptr);
     QVERIFY(job->suspend());
     QVERIFY(!spyResult.wait(300));
     QVERIFY(job->resume());
@@ -644,8 +644,8 @@
     const QUrl d = QUrl::fromLocalFile(dest);
     KIO::Job *job = KIO::copy(u, d, KIO::HideProgressInfo);
     QSignalSpy spyResult(job, SIGNAL(result(KJob*)));
-    job->setUiDelegate(0);
-    job->setUiDelegateExtension(0);
+    job->setUiDelegate(nullptr);
+    job->setUiDelegateExtension(nullptr);
     QVERIFY(job->suspend());
     QVERIFY(!spyResult.wait(300));
     QVERIFY(job->resume());
@@ -662,7 +662,7 @@
 
     // move the file with file_move
     KIO::Job *job = KIO::file_move(u, d, 0666, KIO::HideProgressInfo);
-    job->setUiDelegate(0);
+    job->setUiDelegate(nullptr);
     bool ok = job->exec();
     QVERIFY(ok);
     QVERIFY(QFile::exists(dest));
@@ -671,8 +671,8 @@
 
     // move it back with KIO::move()
     job = KIO::move(d, u, KIO::HideProgressInfo);
-    job->setUiDelegate(0);
-    job->setUiDelegateExtension(0);
+    job->setUiDelegate(nullptr);
+    job->setUiDelegateExtension(nullptr);
     ok = job->exec();
     QVERIFY(ok);
     QVERIFY(!QFile::exists(dest));
@@ -688,8 +688,8 @@
 
     // move the symlink with move, NOT with file_move
     KIO::Job *job = KIO::move(u, d, KIO::HideProgressInfo);
-    job->setUiDelegate(0);
-    job->setUiDelegateExtension(0);
+    job->setUiDelegate(nullptr);
+    job->setUiDelegateExtension(nullptr);
     bool ok = job->exec();
     if (!ok) {
         qWarning() << job->error();
@@ -700,8 +700,8 @@
 
     // move it back with KIO::move()
     job = KIO::move(d, u, KIO::HideProgressInfo);
-    job->setUiDelegate(0);
-    job->setUiDelegateExtension(0);
+    job->setUiDelegate(nullptr);
+    job->setUiDelegateExtension(nullptr);
     ok = job->exec();
     QVERIFY(ok);
     QVERIFY(QT_LSTAT(QFile::encodeName(dest).constData(), &buf) != 0); // doesn't exist anymore
@@ -721,8 +721,8 @@
     QUrl d = QUrl::fromLocalFile(dest);
 
     KIO::Job *job = KIO::move(u, d, KIO::HideProgressInfo);
-    job->setUiDelegate(0);
-    job->setUiDelegateExtension(0);
+    job->setUiDelegate(nullptr);
+    job->setUiDelegateExtension(nullptr);
     bool ok = job->exec();
     QVERIFY2(ok, qPrintable(job->errorString()));
     QVERIFY(QFile::exists(dest));
@@ -811,8 +811,8 @@
     // When trying to move it
     const QString dest = homeTmpDir() + "dest";
     KIO::CopyJob *job = KIO::move(QUrl::fromLocalFile(src), QUrl::fromLocalFile(dest), KIO::HideProgressInfo);
-    job->setUiDelegate(0);
-    job->setUiDelegateExtension(0); // no skip dialog, thanks
+    job->setUiDelegate(nullptr);
+    job->setUiDelegateExtension(nullptr); // no skip dialog, thanks
 
     // The job should fail with "access denied"
     QVERIFY(!job->exec());
@@ -842,8 +842,8 @@
     // When trying to move it
     const QString dest = homeTmpDir() + "mdnp";
     KIO::CopyJob *job = KIO::move(QUrl::fromLocalFile(src), QUrl::fromLocalFile(dest), KIO::HideProgressInfo);
-    job->setUiDelegate(0);
-    job->setUiDelegateExtension(0); // no skip dialog, thanks
+    job->setUiDelegate(nullptr);
+    job->setUiDelegateExtension(nullptr); // no skip dialog, thanks
 
     // The job should fail with "access denied"
     QVERIFY(!job->exec());
@@ -868,7 +868,7 @@
     QVERIFY(symlinkOk);
 #endif
     KIO::ListJob *job = KIO::listRecursive(QUrl::fromLocalFile(src), KIO::HideProgressInfo);
-    job->setUiDelegate(0);
+    job->setUiDelegate(nullptr);
     connect(job, SIGNAL(entries(KIO::Job*,KIO::UDSEntryList)),
             SLOT(slotEntries(KIO::Job*,KIO::UDSEntryList)));
     bool ok = job->exec();
@@ -903,14 +903,14 @@
     const QString filePath = homeTmpDir() + "fileFromHome";
     createTestFile(filePath);
     KIO::ListJob *job = KIO::listDir(QUrl::fromLocalFile(filePath), KIO::HideProgressInfo);
-    job->setUiDelegate(0);
+    job->setUiDelegate(nullptr);
     QVERIFY(!job->exec());
     QCOMPARE(job->error(), static_cast<int>(KIO::ERR_IS_FILE));
 
     // And list something that doesn't exist
     const QString path = homeTmpDir() + "fileFromHomeDoesNotExist";
     job = KIO::listDir(QUrl::fromLocalFile(path), KIO::HideProgressInfo);
-    job->setUiDelegate(0);
+    job->setUiDelegate(nullptr);
     QVERIFY(!job->exec());
     QCOMPARE(job->error(), static_cast<int>(KIO::ERR_DOES_NOT_EXIST));
 }
@@ -921,10 +921,10 @@
     KIO::ListJob *job = KIO::listDir(QUrl::fromLocalFile(src), KIO::HideProgressInfo);
     QVERIFY(job->isAutoDelete());
     QPointer<KIO::ListJob> ptr(job);
-    job->setUiDelegate(0);
+    job->setUiDelegate(nullptr);
     qApp->processEvents(); // let the job start, it's no fun otherwise
     job->kill();
-    qApp->sendPostedEvents(0, QEvent::DeferredDelete); // process the deferred delete of the job
+    qApp->sendPostedEvents(nullptr, QEvent::DeferredDelete); // process the deferred delete of the job
     QVERIFY(ptr.isNull());
 }
 
@@ -934,9 +934,9 @@
     KIO::Job *job = KIO::stat(QUrl::fromLocalFile(src), KIO::HideProgressInfo);
     QVERIFY(job->isAutoDelete());
     QPointer<KIO::Job> ptr(job);
-    job->setUiDelegate(0);
+    job->setUiDelegate(nullptr);
     job->kill();
-    qApp->sendPostedEvents(0, QEvent::DeferredDelete); // process the deferred delete of the job
+    qApp->sendPostedEvents(nullptr, QEvent::DeferredDelete); // process the deferred delete of the job
     QVERIFY(ptr.isNull());
     qApp->processEvents(); // does KIO scheduler crash here? nope.
 }
@@ -946,7 +946,7 @@
     const QString src = homeTmpDir();
     KIO::Job *job = KIO::stat(QUrl::fromLocalFile(src), KIO::HideProgressInfo);
     QVERIFY(job->isAutoDelete());
-    job->setUiDelegate(0);
+    job->setUiDelegate(nullptr);
     delete job;
     qApp->processEvents(); // does KIO scheduler crash here?
 }
@@ -958,7 +958,7 @@
     const QString src = homeTmpDir();
 
     KIO::DirectorySizeJob *job = KIO::directorySize(QUrl::fromLocalFile(src));
-    job->setUiDelegate(0);
+    job->setUiDelegate(nullptr);
     bool ok = job->exec();
     QVERIFY(ok);
     qDebug() << "totalSize: " << job->totalSize();
@@ -974,16 +974,16 @@
     QVERIFY(job->totalSize() >= 325);
 #endif
 
-    qApp->sendPostedEvents(0, QEvent::DeferredDelete);
+    qApp->sendPostedEvents(nullptr, QEvent::DeferredDelete);
 }
 
 void JobTest::directorySizeError()
 {
     KIO::DirectorySizeJob *job = KIO::directorySize(QUrl::fromLocalFile(QStringLiteral("/I/Dont/Exist")));
-    job->setUiDelegate(0);
+    job->setUiDelegate(nullptr);
     bool ok = job->exec();
     QVERIFY(!ok);
-    qApp->sendPostedEvents(0, QEvent::DeferredDelete);
+    qApp->sendPostedEvents(nullptr, QEvent::DeferredDelete);
 }
 
 void JobTest::slotEntries(KIO::Job *, const KIO::UDSEntryList &lst)
@@ -1090,8 +1090,8 @@
     QVERIFY(!url.isValid());
 
     KIO::SimpleJob *job = KIO::get(url, KIO::NoReload, KIO::HideProgressInfo);
-    QVERIFY(job != 0);
-    job->setUiDelegate(0);
+    QVERIFY(job != nullptr);
+    job->setUiDelegate(nullptr);
 
     KIO::Scheduler::setJobPriority(job, 1); // shouldn't crash (#135456)
 
@@ -1101,7 +1101,7 @@
 
 void JobTest::slotMimetype(KIO::Job *job, const QString &type)
 {
-    QVERIFY(job != 0);
+    QVERIFY(job != nullptr);
     m_mimetype = type;
 }
 
@@ -1110,7 +1110,7 @@
     const QString dest = otherTmpDir() + "fileFromHome_copied";
     createTestFile(dest);
     KIO::Job *job = KIO::del(QUrl::fromLocalFile(dest), KIO::HideProgressInfo);
-    job->setUiDelegate(0);
+    job->setUiDelegate(nullptr);
     bool ok = job->exec();
     QVERIFY(ok);
     QVERIFY(!QFile::exists(dest));
@@ -1137,7 +1137,7 @@
 #endif
 
     KIO::Job *job = KIO::del(QUrl::fromLocalFile(dest), KIO::HideProgressInfo);
-    job->setUiDelegate(0);
+    job->setUiDelegate(nullptr);
     bool ok = job->exec();
     QVERIFY(ok);
     QVERIFY(!QFile::exists(dest));
@@ -1160,7 +1160,7 @@
         QVERIFY(QFile::exists(dest));
     }
     KIO::Job *job = KIO::del(QUrl::fromLocalFile(dest), KIO::HideProgressInfo);
-    job->setUiDelegate(0);
+    job->setUiDelegate(nullptr);
     bool ok = job->exec();
     QVERIFY(ok);
     QVERIFY(!QFile::exists(dest));
@@ -1193,7 +1193,7 @@
     QTime dt;
     dt.start();
     KIO::Job *job = KIO::del(dirs, KIO::HideProgressInfo);
-    job->setUiDelegate(0);
+    job->setUiDelegate(nullptr);
     bool ok = job->exec();
     QVERIFY(ok);
     Q_FOREACH (const QUrl &dir, dirs) {
@@ -1242,7 +1242,7 @@
         QVERIFY(QFile::exists(file));
         //qDebug() << file;
         KIO::Job *job = KIO::del(url, KIO::HideProgressInfo);
-        job->setUiDelegate(0);
+        job->setUiDelegate(nullptr);
         bool ok = job->exec();
         QVERIFY(ok);
         QVERIFY(!QFile::exists(file));
@@ -1264,7 +1264,7 @@
 
     //qDebug() << file;
     KIO::Job *job = KIO::del(urls, KIO::HideProgressInfo);
-    job->setUiDelegate(0);
+    job->setUiDelegate(nullptr);
     bool ok = job->exec();
     QVERIFY(ok);
     qDebug() << "Deleted" << numFiles << "files in" << dt.elapsed() << "milliseconds";
@@ -1401,7 +1401,7 @@
     QVERIFY(newPerm != origPerm);
     KFileItemList items; items << item;
     KIO::Job *job = KIO::chmod(items, newPerm, S_IWGRP /*TODO: QFile::WriteGroup*/, QString(), QString(), false, KIO::HideProgressInfo);
-    job->setUiDelegate(0);
+    job->setUiDelegate(nullptr);
     QVERIFY(job->exec());
 
     KFileItem newItem(QUrl::fromLocalFile(filePath));
@@ -1485,8 +1485,8 @@
 
     QList<QUrl> urls; urls << QUrl::fromLocalFile(file1) << QUrl::fromLocalFile(file2);
     KIO::CopyJob *job = KIO::move(urls, QUrl::fromLocalFile(otherTmpDir()), KIO::HideProgressInfo);
-    job->setUiDelegate(0);
-    job->setUiDelegateExtension(0);
+    job->setUiDelegate(nullptr);
+    job->setUiDelegateExtension(nullptr);
     job->setAutoSkip(true);
     bool ok = job->exec();
     QVERIFY(ok);
@@ -1546,8 +1546,8 @@
 
     QList<QUrl> urls; urls << QUrl::fromLocalFile(file1) << QUrl::fromLocalFile(file2);
     KIO::CopyJob *job = KIO::move(urls, QUrl::fromLocalFile(destDir), KIO::HideProgressInfo);
-    job->setUiDelegate(0);
-    job->setUiDelegateExtension(0);
+    job->setUiDelegate(nullptr);
+    job->setUiDelegateExtension(nullptr);
     job->setAutoRename(true);
 
     //qDebug() << QDir(destDir).entryList();
@@ -1585,7 +1585,7 @@
     createTestFile(existingDest);
 
     KIO::FileCopyJob *job = KIO::file_move(QUrl::fromLocalFile(sourceFile), QUrl::fromLocalFile(existingDest), -1, KIO::HideProgressInfo | KIO::Overwrite);
-    job->setUiDelegate(0);
+    job->setUiDelegate(nullptr);
     bool ok = job->exec();
     QVERIFY(ok);
     QVERIFY(!QFile::exists(sourceFile)); // it was moved
@@ -1596,7 +1596,7 @@
     createTestSymlink(existingDest, QFile::encodeName(sourceFile));
     QVERIFY(QFile::exists(existingDest));
     job = KIO::file_move(QUrl::fromLocalFile(sourceFile), QUrl::fromLocalFile(existingDest), -1, KIO::HideProgressInfo | KIO::Overwrite);
-    job->setUiDelegate(0);
+    job->setUiDelegate(nullptr);
     ok = job->exec();
     QVERIFY(ok);
     QVERIFY(!QFile::exists(sourceFile)); // it was moved
@@ -1607,7 +1607,7 @@
     createTestSymlink(existingDest, QFile::encodeName(sourceFile + "2"));
     QVERIFY(QFile::exists(existingDest));
     job = KIO::file_move(QUrl::fromLocalFile(sourceFile), QUrl::fromLocalFile(existingDest), -1, KIO::HideProgressInfo | KIO::Overwrite);
-    job->setUiDelegate(0);
+    job->setUiDelegate(nullptr);
     ok = job->exec();
     QVERIFY(ok);
     QVERIFY(!QFile::exists(sourceFile)); // it was moved
@@ -1617,7 +1617,7 @@
     createTestSymlink(existingDest);
     QVERIFY(!QFile::exists(existingDest)); // it exists, but it's broken...
     job = KIO::file_move(QUrl::fromLocalFile(sourceFile), QUrl::fromLocalFile(existingDest), -1, KIO::HideProgressInfo | KIO::Overwrite);
-    job->setUiDelegate(0);
+    job->setUiDelegate(nullptr);
     ok = job->exec();
     QVERIFY(ok);
     QVERIFY(!QFile::exists(sourceFile)); // it was moved
@@ -1634,8 +1634,8 @@
     QVERIFY(QFile::exists(existingDest));
 
     KIO::CopyJob *job = KIO::move(QUrl::fromLocalFile(sourceFile), QUrl::fromLocalFile(existingDest), KIO::HideProgressInfo);
-    job->setUiDelegate(0);
-    job->setUiDelegateExtension(0);
+    job->setUiDelegate(nullptr);
+    job->setUiDelegateExtension(nullptr);
     bool ok = job->exec();
     QVERIFY(!ok);
     QCOMPARE(job->error(), (int)KIO::ERR_FILE_ALREADY_EXIST); // and not ERR_IDENTICAL_FILES!
@@ -1826,7 +1826,7 @@
     QSignalSpy spyMimeType(job, SIGNAL(mimetype(long,QString)));
     QSignalSpy spyResultId(job, SIGNAL(result(long)));
     QSignalSpy spyResult(job, SIGNAL(result(KJob*)));
-    job->setUiDelegate(0);
+    job->setUiDelegate(nullptr);
 
     for (int i = 1; i < numFiles; ++i) {
         const QUrl url = urls.at(i);
Index: autotests/kcookiejar/kcookiejartest.cpp
===================================================================
--- autotests/kcookiejar/kcookiejartest.cpp
+++ autotests/kcookiejar/kcookiejartest.cpp
@@ -32,7 +32,7 @@
 static KCookieJar *jar;
 static QString *lastYear;
 static QString *nextYear;
-static KConfig *config = 0;
+static KConfig *config = nullptr;
 static int windowId = 1234; // random number to be used as windowId for test cookies
 
 static void FAIL(const QString &msg)
@@ -152,7 +152,7 @@
 
     QString expectedCookies = line;
 
-    QString cookies = jar->findCookies(urlStr, false, windowId, 0).trimmed();
+    QString cookies = jar->findCookies(urlStr, false, windowId, nullptr).trimmed();
     if (cookies != expectedCookies)
         FAIL(urlStr + QStringLiteral("\nGot '%1' expected '%2'")
              .arg(cookies, expectedCookies));
Index: autotests/kdirlistertest.cpp
===================================================================
--- autotests/kdirlistertest.cpp
+++ autotests/kdirlistertest.cpp
@@ -46,7 +46,7 @@
     // To avoid a runtime dependency on klauncher
     qputenv("KDE_FORK_SLAVES", "yes");
 
-    KIO::setDefaultJobUiDelegateExtension(0); // no "skip" dialogs
+    KIO::setDefaultJobUiDelegateExtension(nullptr); // no "skip" dialogs
 
     m_exitCount = 1;
 
@@ -75,7 +75,7 @@
 void KDirListerTest::cleanup()
 {
     m_dirLister.clearSpies();
-    disconnect(&m_dirLister, 0, this, 0);
+    disconnect(&m_dirLister, nullptr, this, nullptr);
 }
 
 void KDirListerTest::testOpenUrl()
@@ -113,7 +113,7 @@
     //qDebug() << "In dir" << QDir(path).entryList( QDir::AllEntries | QDir::NoDotAndDotDot);
     QCOMPARE(m_items.count(), fileCount());
     QVERIFY(m_dirLister.isFinished());
-    disconnect(&m_dirLister, 0, this, 0);
+    disconnect(&m_dirLister, nullptr, this, nullptr);
 
     const QString fileName = QStringLiteral("toplevelfile_3");
     const QUrl itemUrl = QUrl::fromLocalFile(path + fileName);
@@ -175,7 +175,7 @@
         QVERIFY(secondDirLister.isFinished());
     }
 
-    disconnect(&m_dirLister, 0, this, 0);
+    disconnect(&m_dirLister, nullptr, this, nullptr);
 }
 
 // This test assumes testOpenUrl was run before. So m_dirLister is holding the items already.
@@ -329,7 +329,7 @@
     }
 
     // TODO: test file update.
-    disconnect(&m_dirLister, 0, this, 0);
+    disconnect(&m_dirLister, nullptr, this, nullptr);
 
     QFile::remove(symPath);
 }
@@ -480,7 +480,7 @@
     QVERIFY(m_dirLister.isFinished());
     QCOMPARE(m_items.count(), origItemCount - 1);
 
-    disconnect(&m_dirLister, 0, this, 0);
+    disconnect(&m_dirLister, nullptr, this, nullptr);
     QCOMPARE(fileCount(), m_items.count());
 }
 
@@ -505,7 +505,7 @@
     QCOMPARE(entry.first.mimetype(), QString("application/octet-stream"));
     QCOMPARE(entry.second.url().toLocalFile(), newPath);
     QCOMPARE(entry.second.mimetype(), QString("text/html"));
-    disconnect(&m_dirLister, 0, this, 0);
+    disconnect(&m_dirLister, nullptr, this, nullptr);
 
     // Let's see what KDirLister has in cache now
     KFileItem cachedItem = m_dirLister.findByUrl(QUrl::fromLocalFile(newPath));
@@ -553,7 +553,7 @@
     QPair<KFileItem, KFileItem> entry = m_refreshedItems.first();
     QCOMPARE(entry.first.url().toLocalFile(), newPath);
     QCOMPARE(entry.second.url().toLocalFile(), path);
-    disconnect(&m_dirLister, 0, this, 0);
+    disconnect(&m_dirLister, nullptr, this, nullptr);
 
     // Let's see what KDirLister has in cache now
     KFileItem cachedItem = m_dirLister.findByUrl(QUrl::fromLocalFile(path));
@@ -633,8 +633,8 @@
         QTest::qWait(1000);
     }
 
-    disconnect(&m_dirLister, 0, this, 0);
-    disconnect(&dirLister2, 0, this, 0);
+    disconnect(&m_dirLister, nullptr, this, nullptr);
+    disconnect(&dirLister2, nullptr, this, nullptr);
 }
 
 void KDirListerTest::testConcurrentHoldingListing()
@@ -693,7 +693,7 @@
     QCOMPARE(m_dirLister.spyClearQUrl.count(), 0);
     QVERIFY(dirLister2.isFinished());
     QVERIFY(m_dirLister.isFinished());
-    disconnect(&m_dirLister, 0, this, 0);
+    disconnect(&m_dirLister, nullptr, this, nullptr);
     QCOMPARE(m_items.count(), origItemCount);
 }
 
@@ -766,7 +766,7 @@
     QCOMPARE(m_dirLister.spyClear.count(), 1);
     QCOMPARE(m_dirLister.spyClearQUrl.count(), 0);
 
-    disconnect(&m_dirLister, 0, this, 0);
+    disconnect(&m_dirLister, nullptr, this, nullptr);
 }
 
 void KDirListerTest::testDeleteListerEarly()
@@ -821,7 +821,7 @@
         QCOMPARE(m_items.count(), origItemCount);
     }
     QVERIFY(secondDirLister.isFinished());
-    disconnect(&secondDirLister, 0, this, 0);
+    disconnect(&secondDirLister, nullptr, this, nullptr);
 }
 
 void KDirListerTest::testOpenUrlTwiceWithKeep()
@@ -859,7 +859,7 @@
     QCOMPARE(secondDirLister.spyClearQUrl.count(), 1);
     QCOMPARE(m_items.count(), 0);
     QVERIFY(secondDirLister.isFinished());
-    disconnect(&secondDirLister, 0, this, 0);
+    disconnect(&secondDirLister, nullptr, this, nullptr);
 
     QDir().remove(path);
 }
@@ -882,7 +882,7 @@
     QCOMPARE(m_dirLister.spyClearQUrl.count(), 0);
     QCOMPARE(m_items.count(), 0); // we had time to stop before the job even started
     QVERIFY(m_dirLister.isFinished());
-    disconnect(&m_dirLister, 0, this, 0);
+    disconnect(&m_dirLister, nullptr, this, nullptr);
 }
 
 // A bug in the decAutoUpdate/incAutoUpdate logic made KDirLister stop watching a directory for changes,
@@ -974,7 +974,7 @@
     // Check that the URL of the root item got updated
     QCOMPARE(secondDirLister.rootItem().url().toLocalFile(), newPath);
 
-    disconnect(&secondDirLister, 0, this, 0);
+    disconnect(&secondDirLister, nullptr, this, nullptr);
     QDir().rmdir(newPath);
 }
 
@@ -1009,7 +1009,7 @@
     connect(&m_dirLister, SIGNAL(redirection(QUrl)), this, SLOT(exitLoop()));
     //Enter loop to get the redirection signal.
     enterLoop();
-    disconnect(&m_dirLister, 0, this, 0);
+    disconnect(&m_dirLister, nullptr, this, nullptr);
     QDir().rmdir(newPath);
 }
 
@@ -1054,7 +1054,7 @@
 
     m_dirLister.stop(url);
     QVERIFY(!m_dirLister.isFinished());
-    disconnect(&m_dirLister, 0, this, 0);
+    disconnect(&m_dirLister, nullptr, this, nullptr);
 }
 
 void KDirListerTest::testListEmptyDirFromCache() // #278431
@@ -1275,7 +1275,7 @@
 
     // Move b into a
     KIO::Job *moveJob = KIO::move(QUrl::fromLocalFile(dirB), QUrl::fromLocalFile(dirA));
-    moveJob->setUiDelegate(0);
+    moveJob->setUiDelegate(nullptr);
     QVERIFY(moveJob->exec());
     QVERIFY(QFileInfo(m_tempDir.path() + "/a/b").isDir());
 
@@ -1285,7 +1285,7 @@
     // Copy folder a elsewhere
     const QString dest = m_tempDir.path() + "/subdir";
     KIO::Job *copyJob = KIO::copy(QUrl::fromLocalFile(dirA), QUrl::fromLocalFile(dest));
-    copyJob->setUiDelegate(0);
+    copyJob->setUiDelegate(nullptr);
     QVERIFY(copyJob->exec());
     QVERIFY(QFileInfo(m_tempDir.path() + "/subdir/a/b").isDir());
 }
Index: autotests/kdirmodeltest.cpp
===================================================================
--- autotests/kdirmodeltest.cpp
+++ autotests/kdirmodeltest.cpp
@@ -62,10 +62,10 @@
 
     qRegisterMetaType<KFileItemList>("KFileItemList");
 
-    m_dirModelForExpand = 0;
-    m_dirModel = 0;
+    m_dirModelForExpand = nullptr;
+    m_dirModel = nullptr;
     s_referenceTimeStamp = QDateTime::currentDateTime().addSecs(-30);   // 30 seconds ago
-    m_tempDir = 0;
+    m_tempDir = nullptr;
     m_topLevelFileNames << QStringLiteral("toplevelfile_1")
                         << QStringLiteral("toplevelfile_2")
                         << QStringLiteral("toplevelfile_3")
@@ -117,9 +117,9 @@
 void KDirModelTest::cleanupTestCase()
 {
     delete m_tempDir;
-    m_tempDir = 0;
+    m_tempDir = nullptr;
     delete m_dirModel;
-    m_dirModel = 0;
+    m_dirModel = nullptr;
 }
 
 void KDirModelTest::fillModel(bool reload, bool expectAllIndexes)
@@ -127,7 +127,7 @@
     if (!m_dirModel) {
         m_dirModel = new KDirModel;
     }
-    m_dirModel->dirLister()->setAutoErrorHandlingEnabled(false, 0);
+    m_dirModel->dirLister()->setAutoErrorHandlingEnabled(false, nullptr);
     const QString path = m_tempDir->path() + '/';
     KDirLister *dirLister = m_dirModel->dirLister();
     qDebug() << "Calling openUrl";
@@ -146,8 +146,8 @@
 void KDirModelTest::cleanup()
 {
     if (m_dirModel) {
-        disconnect(m_dirModel, 0, &m_eventLoop, 0);
-        disconnect(m_dirModel->dirLister(), 0, this, 0);
+        disconnect(m_dirModel, nullptr, &m_eventLoop, nullptr);
+        disconnect(m_dirModel->dirLister(), nullptr, this, nullptr);
         m_dirModel->dirLister()->setNameFilter(QString());
         m_dirModel->dirLister()->setMimeFilter(QStringList());
         m_dirModel->dirLister()->emitChanges();
@@ -513,8 +513,8 @@
     // Move
     qDebug() << "Moving" << srcdir << "to" << dest;
     KIO::CopyJob *job = KIO::move(QUrl::fromLocalFile(srcdir), QUrl::fromLocalFile(dest), KIO::HideProgressInfo);
-    job->setUiDelegate(0);
-    job->setUiDelegateExtension(0);
+    job->setUiDelegate(nullptr);
+    job->setUiDelegateExtension(nullptr);
     QVERIFY(job->exec());
 
     // wait for kdirnotify
@@ -532,8 +532,8 @@
     // Move back
     qDebug() << "Moving" << dest + dir << "back to" << srcdir;
     job = KIO::move(QUrl::fromLocalFile(dest + dir), QUrl::fromLocalFile(srcdir), KIO::HideProgressInfo);
-    job->setUiDelegate(0);
-    job->setUiDelegateExtension(0);
+    job->setUiDelegate(nullptr);
+    job->setUiDelegateExtension(nullptr);
     QVERIFY(job->exec());
 
     enterLoop();
@@ -620,7 +620,7 @@
     // QCOMPARE(dirListerForExpand->url().toLocalFile(), path+"subdir");
 
     delete m_dirModelForExpand;
-    m_dirModelForExpand = 0;
+    m_dirModelForExpand = nullptr;
 }
 
 void KDirModelTest::testRenameDirectoryInCache() // #188807
@@ -632,7 +632,7 @@
 
     // No more dirmodel nor dirlister.
     delete m_dirModel;
-    m_dirModel = 0;
+    m_dirModel = nullptr;
 
     // Now let's rename a directory that is in KCoreDirListerCache
     const QUrl url = QUrl::fromLocalFile(path);
@@ -673,7 +673,7 @@
     QVERIFY(newPerm != origPerm);
     KFileItemList items; items << rootItem;
     KIO::Job *job = KIO::chmod(items, newPerm, S_IWGRP /*TODO: QFile::WriteGroup*/, QString(), QString(), false, KIO::HideProgressInfo);
-    job->setUiDelegate(0);
+    job->setUiDelegate(nullptr);
     QVERIFY(job->exec());
     // ChmodJob doesn't talk to KDirNotify, kpropertiesdialog does.
     // [this allows to group notifications after all the changes one can make in the dialog]
@@ -1287,7 +1287,7 @@
     QSignalSpy spyDataChanged(m_dirModel, SIGNAL(dataChanged(QModelIndex,QModelIndex)));
 
     KIO::Job *job = KIO::move(QUrl::fromLocalFile(dir), QUrl::fromLocalFile(file), KIO::HideProgressInfo);
-    job->setUiDelegate(0);
+    job->setUiDelegate(nullptr);
     PredefinedAnswerJobUiDelegate extension;
     extension.m_renameResult = KIO::R_OVERWRITE;
     job->setUiDelegateExtension(&extension);
Index: autotests/kfilecopytomenutest.cpp
===================================================================
--- autotests/kfilecopytomenutest.cpp
+++ autotests/kfilecopytomenutest.cpp
@@ -52,7 +52,7 @@
 
         m_srcFile = m_srcDir + "/srcfile";
 
-        KIO::setDefaultJobUiDelegateExtension(0); // no "skip" dialogs
+        KIO::setDefaultJobUiDelegateExtension(nullptr); // no "skip" dialogs
 
         // Set a recent dir
         KConfigGroup recentDirsGroup(KSharedConfig::openConfig(), "kuick-copy");
Index: autotests/kfilewidgettest.cpp
===================================================================
--- autotests/kfilewidgettest.cpp
+++ autotests/kfilewidgettest.cpp
@@ -58,7 +58,7 @@
                 return label->buddy();
         }
         Q_ASSERT(false);
-        return 0;
+        return nullptr;
     }
 
     void testFocusOnLocationEdit()
Index: autotests/klocalsockettest.cpp
===================================================================
--- autotests/klocalsockettest.cpp
+++ autotests/klocalsockettest.cpp
@@ -31,7 +31,7 @@
 
 tst_KLocalSocket::tst_KLocalSocket()
 {
-    server = 0;
+    server = nullptr;
     QFile::remove(QFile::decodeName(socketpath));
 }
 
@@ -112,7 +112,7 @@
 
     // start thread:
     TimedTest thr(socket2);
-    socket2->setParent(0);
+    socket2->setParent(nullptr);
     socket2->moveToThread(&thr);
     thr.start();
 
Index: autotests/knewfilemenutest.cpp
===================================================================
--- autotests/knewfilemenutest.cpp
+++ autotests/knewfilemenutest.cpp
@@ -125,7 +125,7 @@
         menu.checkUpToDate();
         QAction *action = coll.action(QStringLiteral("the_action"));
         QVERIFY(action);
-        QAction *textAct = 0;
+        QAction *textAct = nullptr;
         Q_FOREACH (QAction *act, action->menu()->actions()) {
             if (act->text().contains(actionText)) {
                 textAct = act;
Index: autotests/krununittest.cpp
===================================================================
--- autotests/krununittest.cpp
+++ autotests/krununittest.cpp
@@ -237,7 +237,7 @@
 {
 public:
     KRunImpl(const QUrl &url)
-        : KRun(url, 0, false), m_errCode(-1) {}
+        : KRun(url, nullptr, false), m_errCode(-1) {}
 
     void foundMimeType(const QString &type) Q_DECL_OVERRIDE {
         m_mimeType = type;
@@ -356,8 +356,8 @@
 
     // When calling KRun::runService or KRun::runApplication
     qint64 pid = useRunApplication
-        ? KRun::runApplication(service, urls, 0, tempFile ? KRun::RunFlags(KRun::DeleteTemporaryFiles) : KRun::RunFlags())
-        : KRun::runService(service, urls, 0, tempFile);
+        ? KRun::runApplication(service, urls, nullptr, tempFile ? KRun::RunFlags(KRun::DeleteTemporaryFiles) : KRun::RunFlags())
+        : KRun::runService(service, urls, nullptr, tempFile);
 
     // Then the service should be executed (which copies the source file to "dest")
     QVERIFY(pid != 0);
Index: autotests/ktcpsockettest.cpp
===================================================================
--- autotests/ktcpsockettest.cpp
+++ autotests/ktcpsockettest.cpp
@@ -43,7 +43,7 @@
 public:
     Server *volatile server;
     ServerThread()
-        : server(0) {}
+        : server(nullptr) {}
     ~ServerThread()
     {
         wait(100);
@@ -54,7 +54,7 @@
 
 KTcpSocketTest::KTcpSocketTest()
 {
-    server = 0;
+    server = nullptr;
 }
 
 KTcpSocketTest::~KTcpSocketTest()
@@ -75,8 +75,8 @@
 }
 
 Server::Server(quint16 _port)
-    : listener(0),
-      socket(0),
+    : listener(nullptr),
+      socket(nullptr),
       port(_port)
 {
     listener = new QTcpServer();
@@ -88,7 +88,7 @@
     Q_ASSERT(socket);
     socket->close();
     socket->deleteLater();
-    socket = 0;
+    socket = nullptr;
 }
 
 void KTcpSocketTest::initTestCase()
@@ -126,7 +126,7 @@
 
 void Server::connectDisconnect()
 {
-    listener->waitForNewConnection(10000, 0);
+    listener->waitForNewConnection(10000, nullptr);
     socket = listener->nextPendingConnection();
 
     cleanupSocket();
@@ -149,7 +149,7 @@
 
 void Server::read()
 {
-    listener->waitForNewConnection(10000, 0);
+    listener->waitForNewConnection(10000, nullptr);
     socket = listener->nextPendingConnection();
 
     socket->write(TESTDATA);
@@ -183,7 +183,7 @@
 
 void Server::write()
 {
-    listener->waitForNewConnection(10000, 0);
+    listener->waitForNewConnection(10000, nullptr);
     socket = listener->nextPendingConnection();
 
     socket->waitForReadyRead(40);
@@ -372,7 +372,7 @@
 
 void Server::states()
 {
-    listener->waitForNewConnection(10000, 0);
+    listener->waitForNewConnection(10000, nullptr);
     socket = listener->nextPendingConnection();
 
     socket->waitForReadyRead(40);
@@ -389,7 +389,7 @@
 
 void Server::errors()
 {
-    listener->waitForNewConnection(10000, 0);
+    listener->waitForNewConnection(10000, nullptr);
     socket = listener->nextPendingConnection();
 
     cleanupSocket();
Index: autotests/kurifiltersearchprovideractionstest.cpp
===================================================================
--- autotests/kurifiltersearchprovideractionstest.cpp
+++ autotests/kurifiltersearchprovideractionstest.cpp
@@ -40,7 +40,7 @@
 void KUriFilterSearchProviderActionsTest::shouldAddActionToMenu()
 {
     KIO::KUriFilterSearchProviderActions shortcutManager;
-    QMenu *menu = new QMenu(0);
+    QMenu *menu = new QMenu(nullptr);
     shortcutManager.addWebShortcutsToMenu(menu);
     //Empty when we don't have selected text
     QVERIFY(menu->actions().isEmpty());
Index: autotests/kurifiltertest.cpp
===================================================================
--- autotests/kurifiltertest.cpp
+++ autotests/kurifiltertest.cpp
@@ -50,7 +50,7 @@
     QTest::newRow(input) << input << expectedResult << expectedUriType << list << absPath << checkForExecutables;
 }
 
-static void runFilterTest(const QString &a, const QString &expectedResult = 0, int expectedUriType = -1, const QStringList &list = QStringList(), const QString &absPath = 0, bool checkForExecutables = true)
+static void runFilterTest(const QString &a, const QString &expectedResult = nullptr, int expectedUriType = -1, const QStringList &list = QStringList(), const QString &absPath = nullptr, bool checkForExecutables = true)
 {
     KUriFilterData *filterData = new KUriFilterData;
     filterData->setData(a);
@@ -238,8 +238,8 @@
         addRow("~/.bashrc", QDir::homePath() + QStringLiteral("/.bashrc"), KUriFilterData::LocalFile, QStringList(QStringLiteral("kshorturifilter")));
     }
     addRow("~", QDir::homePath().toLocal8Bit(), KUriFilterData::LocalDir, QStringList(QStringLiteral("kshorturifilter")), QStringLiteral("/tmp"));
-    addRow("~bin", 0, KUriFilterData::LocalDir, QStringList(QStringLiteral("kshorturifilter")));
-    addRow("~does_not_exist", 0, KUriFilterData::Error, QStringList(QStringLiteral("kshorturifilter")));
+    addRow("~bin", nullptr, KUriFilterData::LocalDir, QStringList(QStringLiteral("kshorturifilter")));
+    addRow("~does_not_exist", nullptr, KUriFilterData::Error, QStringList(QStringLiteral("kshorturifilter")));
 
     // Absolute Path tests for kshorturifilter
     const QStringList kshorturifilter(QStringLiteral("kshorturifilter"));
@@ -357,8 +357,8 @@
     addRow("kbuildsycoca5", QStringLiteral("kbuildsycoca5"), KUriFilterData::Executable, minicliFilters);
     addRow("KDE", QStringLiteral("KDE"), NO_FILTERING, minicliFilters);
     addRow("I/dont/exist", QStringLiteral("I/dont/exist"), NO_FILTERING, minicliFilters);        //krazy:exclude=spelling
-    addRow("/I/dont/exist", 0, KUriFilterData::Error, minicliFilters);           //krazy:exclude=spelling
-    addRow("/I/dont/exist#a", 0, KUriFilterData::Error, minicliFilters);         //krazy:exclude=spelling
+    addRow("/I/dont/exist", nullptr, KUriFilterData::Error, minicliFilters);           //krazy:exclude=spelling
+    addRow("/I/dont/exist#a", nullptr, KUriFilterData::Error, minicliFilters);         //krazy:exclude=spelling
     addRow("kbuildsycoca5 --help", QStringLiteral("kbuildsycoca5 --help"), KUriFilterData::Executable, minicliFilters);   // the args are in argsAndOptions()
     addRow("/bin/sh", QStringLiteral("/bin/sh"), KUriFilterData::Executable, minicliFilters);
     addRow("/bin/sh -q -option arg1", QStringLiteral("/bin/sh -q -option arg1"), KUriFilterData::Executable, minicliFilters);   // the args are in argsAndOptions()
@@ -367,7 +367,7 @@
     // a search using the default search engine
     // 'ls' is a bit of a special case though, due to the toplevel domain called 'ls'
     addRow("cp", QStringLiteral("https://www.google.com/search?q=cp&ie=UTF-8"), KUriFilterData::NetProtocol,
-           QStringList(), 0, false /* don't check for executables, see konq_misc.cc */);
+           QStringList(), nullptr, false /* don't check for executables, see konq_misc.cc */);
 }
 
 void KUriFilterTest::executables()
@@ -382,7 +382,7 @@
     qputenv("SOMEVAR", "/somevar");
     qputenv("ETC", "/etc");
 
-    addRow("$SOMEVAR/kdelibs/kio", 0, KUriFilterData::Error);   // note: this dir doesn't exist...
+    addRow("$SOMEVAR/kdelibs/kio", nullptr, KUriFilterData::Error);   // note: this dir doesn't exist...
     addRow("$ETC/passwd", QStringLiteral("/etc/passwd"), KUriFilterData::LocalFile);
     QString qtdocPath = qtdir + QStringLiteral("/doc/html/functions.html");
     if (QFile::exists(qtdocPath)) {
@@ -412,7 +412,7 @@
     QDir().mkpath(datahome + QStringLiteral("/Dir[Bracket"));
     addRow("$DATAHOME/Dir[Bracket", datahome + QStringLiteral("/Dir[Bracket"), KUriFilterData::LocalDir);
 
-    addRow("$HOME/$KDEDIR/kdebase/kcontrol/ebrowsing", 0, KUriFilterData::Error);
+    addRow("$HOME/$KDEDIR/kdebase/kcontrol/ebrowsing", nullptr, KUriFilterData::Error);
     addRow("$1/$2/$3", QStringLiteral("https://www.google.com/search?q=%241%2F%242%2F%243&ie=UTF-8"), KUriFilterData::NetProtocol);    // can be used as bogus or valid test. Currently triggers default search, i.e. google
     addRow("$$$$", QStringLiteral("https://www.google.com/search?q=%24%24%24%24&ie=UTF-8"), KUriFilterData::NetProtocol);   // worst case scenarios.
 
@@ -436,7 +436,7 @@
 
     addRow(sc.sprintf("gg%cC++", s_delimiter).toUtf8(), QStringLiteral("https://www.google.com/search?q=C%2B%2B&ie=UTF-8"), KUriFilterData::NetProtocol);
     addRow(sc.sprintf("gg%cC#", s_delimiter).toUtf8(), QStringLiteral("https://www.google.com/search?q=C%23&ie=UTF-8"), KUriFilterData::NetProtocol);
-    addRow(sc.sprintf("ya%cfoo bar was here", s_delimiter).toUtf8(), 0, -1);   // this triggers default search, i.e. google
+    addRow(sc.sprintf("ya%cfoo bar was here", s_delimiter).toUtf8(), nullptr, -1);   // this triggers default search, i.e. google
     addRow(sc.sprintf("gg%cwww.kde.org", s_delimiter).toUtf8(), QStringLiteral("https://www.google.com/search?q=www.kde.org&ie=UTF-8"), KUriFilterData::NetProtocol);
     addRow(QStringLiteral("gg%1é").arg(s_delimiter).toUtf8() /*eaccent in utf8*/, QStringLiteral("https://www.google.com/search?q=%C3%A9&ie=UTF-8"), KUriFilterData::NetProtocol);
     addRow(QStringLiteral("gg%1прйвет").arg(s_delimiter).toUtf8() /* greetings in russian utf-8*/, QStringLiteral("https://www.google.com/search?q=%D0%BF%D1%80%D0%B9%D0%B2%D0%B5%D1%82&ie=UTF-8"), KUriFilterData::NetProtocol);
@@ -452,7 +452,7 @@
     const QString host = QHostInfo::localHostName();
     if (host.isEmpty()) {
         const QString expected = QLatin1String("http://") + host;
-        runFilterTest(host, expected, KUriFilterData::NetProtocol, QStringList() << QStringLiteral("localdomainurifilter"), 0, false);
+        runFilterTest(host, expected, KUriFilterData::NetProtocol, QStringList() << QStringLiteral("localdomainurifilter"), nullptr, false);
     }
 }
 
Index: autotests/kurlcompletiontest.cpp
===================================================================
--- autotests/kurlcompletiontest.cpp
+++ autotests/kurlcompletiontest.cpp
@@ -103,11 +103,11 @@
 void KUrlCompletionTest::teardown()
 {
     delete m_completion;
-    m_completion = 0;
+    m_completion = nullptr;
     delete m_tempDir;
-    m_tempDir = 0;
+    m_tempDir = nullptr;
     delete m_completionEmptyCwd;
-    m_completionEmptyCwd = 0;
+    m_completionEmptyCwd = nullptr;
 }
 
 void KUrlCompletionTest::waitForCompletion(KUrlCompletion *completion)
@@ -117,7 +117,7 @@
         QTest::qWait(5);
     }
     // The thread emitted a signal, process it.
-    qApp->sendPostedEvents(0, QEvent::MetaCall);
+    qApp->sendPostedEvents(nullptr, QEvent::MetaCall);
 }
 
 void KUrlCompletionTest::testLocalRelativePath()
Index: autotests/kurlnavigatortest.cpp
===================================================================
--- autotests/kurlnavigatortest.cpp
+++ autotests/kurlnavigatortest.cpp
@@ -29,13 +29,13 @@
 
 void KUrlNavigatorTest::initTestCase()
 {
-    m_navigator = new KUrlNavigator(0, QUrl(QStringLiteral("A")), 0);
+    m_navigator = new KUrlNavigator(nullptr, QUrl(QStringLiteral("A")), nullptr);
 }
 
 void KUrlNavigatorTest::cleanupTestCase()
 {
     delete m_navigator;
-    m_navigator = 0;
+    m_navigator = nullptr;
 }
 
 void KUrlNavigatorTest::testHistorySizeAndIndex()
@@ -257,7 +257,7 @@
 
 void KUrlNavigatorTest::testInitWithRedundantPathSeparators()
 {
-    KUrlNavigator temp_nav(0, QUrl::fromLocalFile(QStringLiteral("/home/foo///test")), 0);
+    KUrlNavigator temp_nav(nullptr, QUrl::fromLocalFile(QStringLiteral("/home/foo///test")), nullptr);
 
     const QUrl buttonUrl = temp_nav.url(3);
 
Index: autotests/listdirtest.cpp
===================================================================
--- autotests/listdirtest.cpp
+++ autotests/listdirtest.cpp
@@ -53,7 +53,7 @@
     /*QBENCHMARK*/ {
         m_receivedEntryCount = -2; // We start at -2 for . and .. slotResult will just increment this value
         KIO::ListJob *job = KIO::listDir(QUrl::fromLocalFile(tempDir.path()), KIO::HideProgressInfo);
-        job->setUiDelegate(0);
+        job->setUiDelegate(nullptr);
         connect(job, SIGNAL(entries(KIO::Job*,KIO::UDSEntryList)), this, SLOT(slotEntries(KIO::Job*,KIO::UDSEntryList)));
 
         QSignalSpy spy(job, SIGNAL(result(KJob*)));
Index: autotests/mkpathjobtest.cpp
===================================================================
--- autotests/mkpathjobtest.cpp
+++ autotests/mkpathjobtest.cpp
@@ -50,7 +50,7 @@
         QVERIFY(QFile::exists(m_dir));
         const QStringList oldEntries = QDir(m_dir).entryList();
         KIO::Job *job = KIO::mkpath(QUrl::fromLocalFile(m_dir));
-        job->setUiDelegate(0);
+        job->setUiDelegate(nullptr);
         QSignalSpy spy(job, SIGNAL(directoryCreated(QUrl)));
         QVERIFY2(job->exec(), qPrintable(job->errorString()));
         QVERIFY(QFile::exists(m_dir));
@@ -63,7 +63,7 @@
         QUrl url = QUrl::fromLocalFile(m_dir);
         url.setPath(url.path() + "/subdir1");
         KIO::Job *job = KIO::mkpath(url);
-        job->setUiDelegate(0);
+        job->setUiDelegate(nullptr);
         QSignalSpy spy(job, SIGNAL(directoryCreated(QUrl)));
         QVERIFY2(job->exec(), qPrintable(job->errorString()));
         QCOMPARE(spy.count(), 1);
@@ -75,7 +75,7 @@
         QUrl url = QUrl::fromLocalFile(m_dir);
         url.setPath(url.path() + "/subdir2/subsubdir");
         KIO::Job *job = KIO::mkpath(url);
-        job->setUiDelegate(0);
+        job->setUiDelegate(nullptr);
         QSignalSpy spy(job, SIGNAL(directoryCreated(QUrl)));
         QVERIFY2(job->exec(), qPrintable(job->errorString()));
         QCOMPARE(spy.count(), 2);
@@ -87,7 +87,7 @@
         const QStringList oldEntries = QDir(m_dir).entryList();
         QUrl url = QUrl::fromLocalFile(m_dir);
         KIO::Job *job = KIO::mkpath(url, url);
-        job->setUiDelegate(0);
+        job->setUiDelegate(nullptr);
         QSignalSpy spy(job, SIGNAL(directoryCreated(QUrl)));
         QVERIFY2(job->exec(), qPrintable(job->errorString()));
         QCOMPARE(job->totalAmount(KJob::Directories), 0ULL);
@@ -102,7 +102,7 @@
         const QUrl baseUrl = url;
         url.setPath(url.path() + "/subdir3");
         KIO::Job *job = KIO::mkpath(url, baseUrl);
-        job->setUiDelegate(0);
+        job->setUiDelegate(nullptr);
         QSignalSpy spy(job, SIGNAL(directoryCreated(QUrl)));
         QVERIFY2(job->exec(), qPrintable(job->errorString()));
         QCOMPARE(spy.count(), 1);
@@ -116,7 +116,7 @@
         const QUrl baseUrl = url;
         url.setPath(url.path() + "/subdir4/subsubdir");
         KIO::Job *job = KIO::mkpath(url, baseUrl);
-        job->setUiDelegate(0);
+        job->setUiDelegate(nullptr);
         QSignalSpy spy(job, SIGNAL(directoryCreated(QUrl)));
         QVERIFY2(job->exec(), qPrintable(job->errorString()));
         QCOMPARE(spy.count(), 2);
@@ -130,7 +130,7 @@
         const QUrl baseUrl = url;
         url.setPath(url.path() + "/subdir5/subsubdir");
         KIO::Job *job = KIO::mkpath(url, QUrl::fromLocalFile(QStringLiteral("/does/not/exist")));
-        job->setUiDelegate(0);
+        job->setUiDelegate(nullptr);
         QSignalSpy spy(job, SIGNAL(directoryCreated(QUrl)));
         QVERIFY2(job->exec(), qPrintable(job->errorString()));
         QCOMPARE(spy.count(), 2);
Index: autotests/pastetest.cpp
===================================================================
--- autotests/pastetest.cpp
+++ autotests/pastetest.cpp
@@ -203,7 +203,7 @@
     KIO::Job *job = KIO::paste(&mimeData, QUrl::fromLocalFile(destDir), KIO::HideProgressInfo);
     QSignalSpy spy(job, SIGNAL(itemCreated(QUrl)));
     QVERIFY(spy.isValid());
-    job->setUiDelegate(0);
+    job->setUiDelegate(nullptr);
     const bool expectedSuccess = !expectedFileName.isEmpty();
     QCOMPARE(job->exec(), expectedSuccess);
     if (expectedSuccess) {
Index: autotests/threadtest.cpp
===================================================================
--- autotests/threadtest.cpp
+++ autotests/threadtest.cpp
@@ -73,7 +73,7 @@
     // copy the file with file_copy
     KIO::Job *job = KIO::file_copy(u, d, -1, KIO::HideProgressInfo);
     //qDebug() << job << u << d;
-    job->setUiDelegate(0);
+    job->setUiDelegate(nullptr);
     bool ret = job->exec();
     //qDebug() << job << "done";
     return ret;
Index: src/core/authinfo.cpp
===================================================================
--- src/core/authinfo.cpp
+++ src/core/authinfo.cpp
@@ -270,7 +270,7 @@
     int index;
 };
 
-NetRC *NetRC::instance = 0L;
+NetRC *NetRC::instance = nullptr;
 
 NetRC::NetRC()
     : d(new NetRCPrivate)
@@ -280,7 +280,7 @@
 NetRC::~NetRC()
 {
     delete instance;
-    instance = 0L;
+    instance = nullptr;
     delete d;
 }
 
Index: src/core/chmodjob.cpp
===================================================================
--- src/core/chmodjob.cpp
+++ src/core/chmodjob.cpp
@@ -98,6 +98,7 @@
 ChmodJob::ChmodJob(ChmodJobPrivate &dd)
     : KIO::Job(dd)
 {
+    int i = 0;
     QMetaObject::invokeMethod(this, "_k_processList", Qt::QueuedConnection);
 }
 
Index: src/core/connection.cpp
===================================================================
--- src/core/connection.cpp
+++ src/core/connection.cpp
@@ -111,7 +111,7 @@
     if (d->backend) {
         d->backend->disconnect(this);
         d->backend->deleteLater();
-        d->backend = 0;
+        d->backend = nullptr;
     }
     d->outgoingTasks.clear();
     d->incomingTasks.clear();
@@ -151,7 +151,7 @@
     if (!d->backend->connectToRemote(address)) {
         //kWarning(7017) << "could not connect to" << address << "using scheme" << scheme ;
         delete d->backend;
-        d->backend = 0;
+        d->backend = nullptr;
         return;
     }
 
Index: src/core/connection_p.h
===================================================================
--- src/core/connection_p.h
+++ src/core/connection_p.h
@@ -37,7 +37,7 @@
 {
 public:
     inline ConnectionPrivate()
-        : backend(0), q(0), suspended(false)
+        : backend(nullptr), q(nullptr), suspended(false)
     { }
 
     void dequeue();
@@ -70,7 +70,7 @@
      * Creates a new connection.
      * @see connectToRemote, listenForRemote
      */
-    explicit Connection(QObject *parent = 0);
+    explicit Connection(QObject *parent = nullptr);
     virtual ~Connection();
 
     /**
Index: src/core/connectionbackend.cpp
===================================================================
--- src/core/connectionbackend.cpp
+++ src/core/connectionbackend.cpp
@@ -38,13 +38,13 @@
 ConnectionBackend::ConnectionBackend(Mode m, QObject *parent)
     : QObject(parent),
       state(Idle),
-      socket(0),
+      socket(nullptr),
       len(-1),
       cmd(0),
       signalEmitted(false),
       mode(m)
 {
-    localServer = 0;
+    localServer = nullptr;
 }
 
 ConnectionBackend::~ConnectionBackend()
@@ -155,7 +155,7 @@
         if (!localServer->listen(sockname, KLocalSocket::UnixSocket)) {
             errorString = localServer->errorString();
             delete localServer;
-            localServer = 0;
+            localServer = nullptr;
             return false;
         }
 
@@ -166,7 +166,7 @@
         if (!tcpServer->isListening()) {
             errorString = tcpServer->errorString();
             delete tcpServer;
-            tcpServer = 0;
+            tcpServer = nullptr;
             return false;
         }
 
@@ -252,7 +252,7 @@
     }
 
     if (!newSocket) {
-        return 0;    // there was no connection...
+        return nullptr;    // there was no connection...
     }
 
     ConnectionBackend *result = new ConnectionBackend(Mode(mode));
@@ -292,13 +292,13 @@
             while (*p == ' ') {
                 p++;
             }
-            len = strtol(p, 0L, 16);
+            len = strtol(p, nullptr, 16);
 
             p = buffer + 7;
             while (*p == ' ') {
                 p++;
             }
-            cmd = strtol(p, 0L, 16);
+            cmd = strtol(p, nullptr, 16);
 
             //qCDebug(KIO_CORE) << this << "Beginning of command" << hex << cmd << "of size" << len;
         }
Index: src/core/connectionbackend_p.h
===================================================================
--- src/core/connectionbackend_p.h
+++ src/core/connectionbackend_p.h
@@ -66,7 +66,7 @@
     void newConnection();
 
 public:
-    explicit ConnectionBackend(Mode m, QObject *parent = 0);
+    explicit ConnectionBackend(Mode m, QObject *parent = nullptr);
     ~ConnectionBackend();
 
     void setSuspended(bool enable);
Index: src/core/connectionserver.h
===================================================================
--- src/core/connectionserver.h
+++ src/core/connectionserver.h
@@ -44,7 +44,7 @@
 {
     Q_OBJECT
 public:
-    ConnectionServer(QObject *parent = 0);
+    ConnectionServer(QObject *parent = nullptr);
     ~ConnectionServer();
 
     /**
Index: src/core/connectionserver.cpp
===================================================================
--- src/core/connectionserver.cpp
+++ src/core/connectionserver.cpp
@@ -28,7 +28,7 @@
 {
 public:
     inline ConnectionServerPrivate()
-        : backend(0)
+        : backend(nullptr)
     { }
 
     ConnectionServer *q;
@@ -55,7 +55,7 @@
 #endif
     if (!d->backend->listenForRemote()) {
         delete d->backend;
-        d->backend = 0;
+        d->backend = nullptr;
         return;
     }
 
@@ -79,18 +79,18 @@
 void ConnectionServer::close()
 {
     delete d->backend;
-    d->backend = 0;
+    d->backend = nullptr;
 }
 
 Connection *ConnectionServer::nextPendingConnection()
 {
     if (!isListening()) {
-        return 0;
+        return nullptr;
     }
 
     ConnectionBackend *newBackend = d->backend->nextPendingConnection();
     if (!newBackend) {
-        return 0;    // no new backend...
+        return nullptr;    // no new backend...
     }
 
     Connection *result = new Connection;
Index: src/core/copyjob.cpp
===================================================================
--- src/core/copyjob.cpp
+++ src/core/copyjob.cpp
@@ -154,7 +154,7 @@
         , m_bOverwriteAllFiles(false)
         , m_bOverwriteAllDirs(false)
         , m_conflictError(0)
-        , m_reportTimer(0)
+        , m_reportTimer(nullptr)
     {
     }
 
@@ -1545,20 +1545,20 @@
                 m_processedFiles++;
                 //emit processedAmount( this, KJob::Files, m_processedFiles );
                 copyNextFile();
-                return 0;
+                return nullptr;
             } else {
                 qCDebug(KIO_COPYJOB_DEBUG) << "ERR_CANNOT_OPEN_FOR_WRITING";
                 q->setError(ERR_CANNOT_OPEN_FOR_WRITING);
                 q->setErrorText(uDest.toLocalFile());
                 q->emitResult();
-                return 0;
+                return nullptr;
             }
         } else {
             // Todo: not show "link" on remote dirs if the src urls are not from the same protocol+host+...
             q->setError(ERR_CANNOT_SYMLINK);
             q->setErrorText(uDest.toDisplayString());
             q->emitResult();
-            return 0;
+            return nullptr;
         }
     }
 }
@@ -1613,7 +1613,7 @@
         const JobFlags flags = bOverwrite ? Overwrite : DefaultFlags;
 
         m_bCurrentOperationIsLink = false;
-        KIO::Job *newjob = 0;
+        KIO::Job *newjob = nullptr;
         if (m_mode == CopyJob::Link) {
             // User requested that a symlink be made
             newjob = linkNextFile(uSource, uDest, flags);
Index: src/core/dataprotocol.cpp
===================================================================
--- src/core/dataprotocol.cpp
+++ src/core/dataprotocol.cpp
@@ -278,7 +278,7 @@
         outData = QByteArray::fromBase64(url_data);
     } else {
         QTextCodec *codec = QTextCodec::codecForName(hdr.attributes[QStringLiteral("charset")].toLatin1());
-        if (codec != 0) {
+        if (codec != nullptr) {
             outData = codec->toUnicode(url_data).toUtf8();
         } else {
             outData = url_data;
Index: src/core/deletejob.cpp
===================================================================
--- src/core/deletejob.cpp
+++ src/core/deletejob.cpp
@@ -75,7 +75,7 @@
         , m_totalFilesDirs(0)
         , m_srcList(src)
         , m_currentStat(m_srcList.begin())
-        , m_reportTimer(0)
+        , m_reportTimer(nullptr)
     {
     }
     DeleteJobState state;
@@ -292,7 +292,7 @@
             // If local file, try do it directly
             if ((*it).isLocalFile() && QFile::remove((*it).toLocalFile())) {
                 //kdDebug(7007) << "DeleteJob deleted" << (*it).toLocalFile();
-                job = 0;
+                job = nullptr;
                 m_processedFiles++;
                 if (m_processedFiles % 300 == 1 || m_totalFilesDirs < 300) {  // update progress info every 300 files
                     m_currentURL = *it;
@@ -361,7 +361,7 @@
         //qDebug() << "KDirNotify'ing FilesRemoved" << m_srcList;
         org::kde::KDirNotify::emitFilesRemoved(m_srcList);
     }
-    if (m_reportTimer != 0) {
+    if (m_reportTimer != nullptr) {
         m_reportTimer->stop();
     }
     q->emitResult();
Index: src/core/filecopyjob.cpp
===================================================================
--- src/core/filecopyjob.cpp
+++ src/core/filecopyjob.cpp
@@ -39,8 +39,8 @@
 public:
     FileCopyJobPrivate(const QUrl &src, const QUrl &dest, int permissions,
                        bool move, JobFlags flags)
-        : m_sourceSize(filesize_t(-1)), m_src(src), m_dest(dest), m_moveJob(0), m_copyJob(0), m_delJob(0),
-          m_chmodJob(0), m_getJob(0), m_putJob(0), m_permissions(permissions),
+        : m_sourceSize(filesize_t(-1)), m_src(src), m_dest(dest), m_moveJob(nullptr), m_copyJob(nullptr), m_delJob(nullptr),
+          m_chmodJob(nullptr), m_getJob(nullptr), m_putJob(nullptr), m_permissions(permissions),
           m_move(move), m_mustChmod(0), m_flags(flags)
     {
     }
@@ -330,7 +330,7 @@
 
     m_canResume = false;
     m_resumeAnswerSent = false;
-    m_getJob = 0L; // for now
+    m_getJob = nullptr; // for now
     m_putJob = put(m_dest, m_permissions, (m_flags | HideProgressInfo) /* no GUI */);
     //qDebug() << "m_putJob=" << m_putJob << "m_dest=" << m_dest;
     if (m_modificationTime.isValid()) {
@@ -372,11 +372,11 @@
                 if (job == m_putJob) {
                     m_putJob->kill(FileCopyJob::Quietly);
                     q->removeSubjob(m_putJob);
-                    m_putJob = 0;
+                    m_putJob = nullptr;
                 } else {
                     m_copyJob->kill(FileCopyJob::Quietly);
                     q->removeSubjob(m_copyJob);
-                    m_copyJob = 0;
+                    m_copyJob = nullptr;
                 }
                 q->setError(ERR_USER_CANCELED);
                 q->emitResult();
@@ -458,7 +458,7 @@
         q->setErrorText(QStringLiteral("'Put' job did not send canResume or 'Get' job did not send data!"));
         m_putJob->kill(FileCopyJob::Quietly);
         q->removeSubjob(m_putJob);
-        m_putJob = 0;
+        m_putJob = nullptr;
         q->emitResult();
         return;
     }
@@ -484,21 +484,21 @@
     // Did job have an error ?
     if (job->error()) {
         if ((job == d->m_moveJob) && (job->error() == ERR_UNSUPPORTED_ACTION)) {
-            d->m_moveJob = 0;
+            d->m_moveJob = nullptr;
             d->startBestCopyMethod();
             return;
         } else if ((job == d->m_copyJob) && (job->error() == ERR_UNSUPPORTED_ACTION)) {
-            d->m_copyJob = 0;
+            d->m_copyJob = nullptr;
             d->startDataPump();
             return;
         } else if (job == d->m_getJob) {
-            d->m_getJob = 0L;
+            d->m_getJob = nullptr;
             if (d->m_putJob) {
                 d->m_putJob->kill(Quietly);
                 removeSubjob(d->m_putJob);
             }
         } else if (job == d->m_putJob) {
-            d->m_putJob = 0L;
+            d->m_putJob = nullptr;
             if (d->m_getJob) {
                 d->m_getJob->kill(Quietly);
                 removeSubjob(d->m_getJob);
@@ -520,11 +520,11 @@
     }
 
     if (job == d->m_moveJob) {
-        d->m_moveJob = 0; // Finished
+        d->m_moveJob = nullptr; // Finished
     }
 
     if (job == d->m_copyJob) {
-        d->m_copyJob = 0;
+        d->m_copyJob = nullptr;
         if (d->m_move) {
             d->m_delJob = file_delete(d->m_src, HideProgressInfo/*no GUI*/);   // Delete source
             addSubjob(d->m_delJob);
@@ -533,7 +533,7 @@
 
     if (job == d->m_getJob) {
         //qDebug() << "m_getJob finished";
-        d->m_getJob = 0; // No action required
+        d->m_getJob = nullptr; // No action required
         if (d->m_putJob) {
             d->m_putJob->d_func()->internalResume();
         }
@@ -541,7 +541,7 @@
 
     if (job == d->m_putJob) {
         //qDebug() << "m_putJob finished";
-        d->m_putJob = 0;
+        d->m_putJob = nullptr;
         if (d->m_getJob) {
             // The get job is still running, probably after emitting data(QByteArray())
             // and before we receive its finished().
@@ -554,11 +554,11 @@
     }
 
     if (job == d->m_delJob) {
-        d->m_delJob = 0; // Finished
+        d->m_delJob = nullptr; // Finished
     }
 
     if (job == d->m_chmodJob) {
-        d->m_chmodJob = 0; // Finished
+        d->m_chmodJob = nullptr; // Finished
     }
 
     if (!hasSubjobs()) {
Index: src/core/forwardingslavebase.cpp
===================================================================
--- src/core/forwardingslavebase.cpp
+++ src/core/forwardingslavebase.cpp
@@ -356,7 +356,7 @@
 {
     // We will forward the warning message, no need to let the job
     // display it itself
-    job->setUiDelegate(0);
+    job->setUiDelegate(nullptr);
 
     // Forward metadata (e.g. modification time for put())
     job->setMetaData(q->allMetaData());
@@ -418,7 +418,7 @@
         q->error(job->error(), job->errorText());
     } else {
         KIO::StatJob *stat_job = qobject_cast<KIO::StatJob *>(job);
-        if (stat_job != 0L) {
+        if (stat_job != nullptr) {
             KIO::UDSEntry entry = stat_job->statResult();
             q->prepareUDSEntry(entry);
             q->statEntry(entry);
Index: src/core/hostinfo.cpp
===================================================================
--- src/core/hostinfo.cpp
+++ src/core/hostinfo.cpp
@@ -205,7 +205,7 @@
 {
     Q_OBJECT
 public:
-    NameLookUpThread() : m_worker(0)
+    NameLookUpThread() : m_worker(nullptr)
     {
         qRegisterMetaType< QSharedPointer<NameLookupThreadRequest> > ();
         start();
@@ -300,7 +300,7 @@
 
 void HostInfo::prefetchHost(const QString &hostName)
 {
-    hostInfoAgentPrivate()->lookupHost(hostName, 0, 0);
+    hostInfoAgentPrivate()->lookupHost(hostName, nullptr, nullptr);
 }
 
 void HostInfo::setCacheSize(int s)
Index: src/core/job.h
===================================================================
--- src/core/job.h
+++ src/core/job.h
@@ -47,7 +47,7 @@
  * @return the created error string
  */
 KIOCORE_EXPORT QString buildHTMLErrorString(int errorCode, const QString &errorText,
-        const QUrl *reqUrl = 0, int method = -1);
+        const QUrl *reqUrl = nullptr, int method = -1);
 
 /**
  * Returns translated error details for @p errorCode using the
@@ -66,7 +66,7 @@
  * @li QStringList solutions - a liso of solutions for the error
  */
 KIOCORE_EXPORT QByteArray rawErrorDetail(int errorCode, const QString &errorText,
-        const QUrl *reqUrl = 0, int method = -1);
+        const QUrl *reqUrl = nullptr, int method = -1);
 }
 
 // kio/job.h is what apps include to get all jobs -> we include jobclasses.h to preserve SC
Index: src/core/job.cpp
===================================================================
--- src/core/job.cpp
+++ src/core/job.cpp
@@ -36,14 +36,14 @@
 
 using namespace KIO;
 
-Job::Job() : KCompositeJob(0)
+Job::Job() : KCompositeJob(nullptr)
     , d_ptr(new JobPrivate)
 {
     d_ptr->q_ptr = this;
     setCapabilities(KJob::Killable | KJob::Suspendable);
 }
 
-Job::Job(JobPrivate &dd) : KCompositeJob(0)
+Job::Job(JobPrivate &dd) : KCompositeJob(nullptr)
     , d_ptr(&dd)
 {
     d_ptr->q_ptr = this;
@@ -200,7 +200,7 @@
 void Job::setParentJob(Job *job)
 {
     Q_D(Job);
-    Q_ASSERT(d->m_parentJob == 0L);
+    Q_ASSERT(d->m_parentJob == nullptr);
     Q_ASSERT(job);
     d->m_parentJob = job;
 }
Index: src/core/job_base.h
===================================================================
--- src/core/job_base.h
+++ src/core/job_base.h
@@ -132,7 +132,7 @@
      * @return the following strings: caption, error + description,
      *         causes+solutions
      */
-    QStringList detailedErrorStrings(const QUrl *reqUrl = 0L,
+    QStringList detailedErrorStrings(const QUrl *reqUrl = nullptr,
                                      int method = -1) const;
 
     /**
Index: src/core/job_error.cpp
===================================================================
--- src/core/job_error.cpp
+++ src/core/job_error.cpp
@@ -1082,7 +1082,7 @@
 
 QFile::Permissions KIO::convertPermissions(int permissions)
 {
-    QFile::Permissions qPermissions(0);
+    QFile::Permissions qPermissions(nullptr);
 
     if (permissions > 0) {
         if (permissions & S_IRUSR) {
Index: src/core/job_p.h
===================================================================
--- src/core/job_p.h
+++ src/core/job_p.h
@@ -46,7 +46,7 @@
 {
 public:
     JobPrivate()
-        : m_parentJob(0L), m_extraFlags(0),
+        : m_parentJob(nullptr), m_extraFlags(0),
           m_uiDelegateExtension(KIO::defaultJobUiDelegateExtension())
     {
     }
@@ -98,7 +98,7 @@
      * @param packedArgs the arguments
      */
     SimpleJobPrivate(const QUrl &url, int command, const QByteArray &packedArgs)
-        : m_slave(0), m_packedArgs(packedArgs), m_url(url), m_command(command),
+        : m_slave(nullptr), m_packedArgs(packedArgs), m_url(url), m_command(command),
           m_checkOnHold(false), m_schedSerial(0), m_redirectionHandlingEnabled(true)
     {
 #if 0
@@ -235,14 +235,14 @@
                               const QByteArray &_staticData)
         : SimpleJobPrivate(url, command, packedArgs),
           m_internalSuspended(false), m_errorPage(false),
-          staticData(_staticData), m_isMimetypeEmitted(false), m_subJob(0)
+          staticData(_staticData), m_isMimetypeEmitted(false), m_subJob(nullptr)
     { }
 
     inline TransferJobPrivate(const QUrl &url, int command, const QByteArray &packedArgs,
                               QIODevice *ioDevice)
         : SimpleJobPrivate(url, command, packedArgs),
           m_internalSuspended(false), m_errorPage(false),
-          m_isMimetypeEmitted(false), m_subJob(0),
+          m_isMimetypeEmitted(false), m_subJob(nullptr),
           m_outgoingDataSource(QPointer<QIODevice>(ioDevice))
     { }
 
Index: src/core/jobtracker.cpp
===================================================================
--- src/core/jobtracker.cpp
+++ src/core/jobtracker.cpp
@@ -19,7 +19,7 @@
 #include "jobtracker.h"
 #include <kjobtrackerinterface.h>
 
-static KJobTrackerInterface *s_tracker = 0;
+static KJobTrackerInterface *s_tracker = nullptr;
 Q_GLOBAL_STATIC(KJobTrackerInterface, globalDummyTracker)
 
 KJobTrackerInterface *KIO::getJobTracker()
Index: src/core/jobuidelegateextension.cpp
===================================================================
--- src/core/jobuidelegateextension.cpp
+++ src/core/jobuidelegateextension.cpp
@@ -22,7 +22,7 @@
 using namespace KIO;
 
 JobUiDelegateExtension::JobUiDelegateExtension()
-    : d(0)
+    : d(nullptr)
 {
 }
 
@@ -32,14 +32,14 @@
 
 ClipboardUpdater *KIO::JobUiDelegateExtension::createClipboardUpdater(Job *, ClipboardUpdaterMode)
 {
-    return NULL;
+    return nullptr;
 }
 
 void KIO::JobUiDelegateExtension::updateUrlInClipboard(const QUrl &, const QUrl &)
 {
 }
 
-static JobUiDelegateExtension *s_extension = 0;
+static JobUiDelegateExtension *s_extension = nullptr;
 
 JobUiDelegateExtension *KIO::defaultJobUiDelegateExtension()
 {
Index: src/core/jobuidelegatefactory.cpp
===================================================================
--- src/core/jobuidelegatefactory.cpp
+++ src/core/jobuidelegatefactory.cpp
@@ -22,7 +22,7 @@
 using namespace KIO;
 
 JobUiDelegateFactory::JobUiDelegateFactory()
-    : d(0)
+    : d(nullptr)
 {
 }
 
@@ -30,11 +30,11 @@
 {
 }
 
-static JobUiDelegateFactory *s_factory = 0;
+static JobUiDelegateFactory *s_factory = nullptr;
 
 KJobUiDelegate *KIO::createDefaultJobUiDelegate()
 {
-    return s_factory ? s_factory->createDelegate() : NULL;
+    return s_factory ? s_factory->createDelegate() : nullptr;
 }
 
 JobUiDelegateFactory *KIO::defaultJobUiDelegateFactory()
Index: src/core/kacl.cpp
===================================================================
--- src/core/kacl.cpp
+++ src/core/kacl.cpp
@@ -41,7 +41,7 @@
 class KACL::KACLPrivate
 {
 public:
-    KACLPrivate() : m_acl(0) {}
+    KACLPrivate() : m_acl(nullptr) {}
 #if HAVE_POSIX_ACL
     KACLPrivate(acl_t acl)
         : m_acl(acl) {}
@@ -139,7 +139,7 @@
 bool KACL::isExtended() const
 {
 #if HAVE_POSIX_ACL
-    return (acl_equiv_mode(d->m_acl, NULL) != 0);
+    return (acl_equiv_mode(d->m_acl, nullptr) != 0);
 #else
     return false;
 #endif
@@ -158,12 +158,12 @@
         }
         ret = acl_get_entry(acl, ACL_NEXT_ENTRY, &entry);
     }
-    return 0;
+    return nullptr;
 }
 
 static unsigned short entryToPermissions(acl_entry_t entry)
 {
-    if (entry == 0) {
+    if (entry == nullptr) {
         return 0;
     }
     acl_permset_t permset;
@@ -177,7 +177,7 @@
 
 static void permissionsToEntry(acl_entry_t entry, unsigned short v)
 {
-    if (entry == 0) {
+    if (entry == nullptr) {
         return;
     }
     acl_permset_t permset;
@@ -326,7 +326,7 @@
     exists = true;
 #if HAVE_POSIX_ACL
     acl_entry_t entry = entryForTag(d->m_acl, ACL_MASK);
-    if (entry == 0) {
+    if (entry == nullptr) {
         exists = false;
         return 0;
     }
@@ -340,7 +340,7 @@
 bool KACL::KACLPrivate::setMaskPermissions(unsigned short v)
 {
     acl_entry_t entry = entryForTag(m_acl, ACL_MASK);
-    if (entry == 0) {
+    if (entry == nullptr) {
         acl_create_entry(&m_acl, &entry);
         acl_set_tag_type(entry, ACL_MASK);
     }
@@ -433,7 +433,7 @@
         // 23.1.1 of 1003.1e states that as soon as there is a named user or
         // named group entry, there needs to be a mask entry as well, so add
         // one, if the user hasn't explicitly set one.
-        if (entryForTag(newACL, ACL_MASK) == 0) {
+        if (entryForTag(newACL, ACL_MASK) == nullptr) {
             acl_calc_mask(&newACL);
         }
     }
@@ -532,7 +532,7 @@
         // 23.1.1 of 1003.1e states that as soon as there is a named user or
         // named group entry, there needs to be a mask entry as well, so add
         // one, if the user hasn't explicitly set one.
-        if (entryForTag(newACL, ACL_MASK) == 0) {
+        if (entryForTag(newACL, ACL_MASK) == nullptr) {
             acl_calc_mask(&newACL);
         }
     }
Index: src/core/kcoredirlister.h
===================================================================
--- src/core/kcoredirlister.h
+++ src/core/kcoredirlister.h
@@ -90,7 +90,7 @@
     /**
      * Create a directory lister.
      */
-    KCoreDirLister(QObject *parent = 0);
+    KCoreDirLister(QObject *parent = nullptr);
 
     /**
      * Destroy the directory lister.
Index: src/core/kcoredirlister.cpp
===================================================================
--- src/core/kcoredirlister.cpp
+++ src/core/kcoredirlister.cpp
@@ -185,7 +185,7 @@
 
         dirData.listersCurrentlyListing.append(lister);
 
-        DirItem *itemFromCache = 0;
+        DirItem *itemFromCache = nullptr;
         if (itemU || (!_reload && (itemFromCache = itemsCached.take(urlStr)))) {
             if (itemU) {
                 qCDebug(KIO_CORE_DIRLISTER) << "Entry already in use:" << _url;
@@ -294,7 +294,7 @@
             return job;
         }
     }
-    return 0;
+    return nullptr;
 }
 
 KCoreDirLister::Private::CachedItemsJob::CachedItemsJob(KCoreDirLister *lister, const QUrl &url, bool reload)
@@ -329,7 +329,7 @@
         emit m_lister->canceled(m_url);
         emit m_lister->canceled();
     }
-    m_lister = 0;
+    m_lister = nullptr;
     return true;
 }
 
@@ -639,7 +639,7 @@
             }
         } else {
             delete item;
-            item = 0;
+            item = nullptr;
         }
     }
 
@@ -660,7 +660,7 @@
 
     const QUrl dir = _dir.adjusted(QUrl::StripTrailingSlash);
     if (!checkUpdate(dir)) {
-        if (dir.isLocalFile() && findByUrl(0, dir)) {
+        if (dir.isLocalFile() && findByUrl(nullptr, dir)) {
             pendingUpdates.insert(dir.toLocalFile());
             if (!pendingUpdateTimer.isActive()) {
                 pendingUpdateTimer.start(500);
@@ -769,7 +769,7 @@
 
 KFileItem KCoreDirListerCache::itemForUrl(const QUrl &url) const
 {
-    KFileItem *item = findByUrl(0, url);
+    KFileItem *item = findByUrl(nullptr, url);
     if (item) {
         return *item;
     } else {
@@ -790,7 +790,7 @@
 NonMovableFileItemList *KCoreDirListerCache::itemsForDir(const QUrl &dir) const
 {
     DirItem *item = dirItemForUrl(dir);
-    return item ? &item->lstItems : 0;
+    return item ? &item->lstItems : nullptr;
 }
 
 KFileItem KCoreDirListerCache::findByName(const KCoreDirLister *lister, const QString &_name) const
@@ -841,7 +841,7 @@
         }
     }
 
-    return 0;
+    return nullptr;
 }
 
 void KCoreDirListerCache::slotFilesAdded(const QString &dir /*url*/)   // from KDirNotify signals
@@ -926,7 +926,7 @@
     QStringList::const_iterator it = fileList.begin();
     for (; it != fileList.end(); ++it) {
         QUrl url(*it);
-        KFileItem *fileitem = findByUrl(0, url);
+        KFileItem *fileitem = findByUrl(nullptr, url);
         if (!fileitem) {
             qCDebug(KIO_CORE_DIRLISTER) << "item not found for" << url;
             continue;
@@ -964,7 +964,7 @@
 #endif
 
     QUrl oldurl = src.adjusted(QUrl::StripTrailingSlash);
-    KFileItem *fileitem = findByUrl(0, oldurl);
+    KFileItem *fileitem = findByUrl(nullptr, oldurl);
     if (!fileitem) {
         qCDebug(KIO_CORE_DIRLISTER) << "Item not found:" << oldurl;
         return;
@@ -976,7 +976,7 @@
     // We better emit it as deleted -before- doing the renaming, otherwise
     // the "update" mechanism will emit the old one as deleted and
     // kdirmodel will delete the new (renamed) one!
-    KFileItem *existingDestItem = findByUrl(0, dst);
+    KFileItem *existingDestItem = findByUrl(nullptr, dst);
     if (existingDestItem) {
         qCDebug(KIO_CORE_DIRLISTER) << dst << "already existed, let's delete it";
         slotFilesRemoved(QList<QUrl>() << dst);
@@ -993,7 +993,7 @@
         renameDir(oldurl, dst);
         // #172945 - if the fileitem was the root item of a DirItem that was just removed from the cache,
         // then it's a dangling pointer now...
-        fileitem = findByUrl(0, oldurl);
+        fileitem = findByUrl(nullptr, oldurl);
         if (!fileitem) { //deleted from cache altogether, #188807
             return;
         }
@@ -1145,7 +1145,7 @@
 void KCoreDirListerCache::handleFileDirty(const QUrl &url)
 {
     // A file: do we know about it already?
-    KFileItem *existingItem = findByUrl(0, url);
+    KFileItem *existingItem = findByUrl(nullptr, url);
     const QUrl dir = url.adjusted(QUrl::RemoveFilename | QUrl::StripTrailingSlash);
     QString filePath = url.toLocalFile();
     if (!existingItem) {
@@ -1759,7 +1759,7 @@
         return;
     }
 
-    DirItem *dir = itemsInUse.value(jobUrlStr, 0);
+    DirItem *dir = itemsInUse.value(jobUrlStr, nullptr);
     if (!dir) {
         qCWarning(KIO_CORE) << "Internal error: itemsInUse did not contain" << jobUrlStr;
 #ifndef NDEBUG
@@ -1908,7 +1908,7 @@
         }
         ++it;
     }
-    return 0;
+    return nullptr;
 }
 
 const QUrl &KCoreDirListerCache::joburl(KIO::ListJob *job)
@@ -2038,7 +2038,7 @@
     foreach (const QString &file, pendingUpdates) { // always a local path
         qCDebug(KIO_CORE_DIRLISTER) << file;
         QUrl u = QUrl::fromLocalFile(file);
-        KFileItem *item = findByUrl(0, u);   // search all items
+        KFileItem *item = findByUrl(nullptr, u);   // search all items
         if (item) {
             // we need to refresh the item, because e.g. the permissions can have changed.
             KFileItem oldItem = *item;
@@ -2557,16 +2557,16 @@
 void KCoreDirLister::Private::emitItems()
 {
     NewItemsHash *tmpNew = lstNewItems;
-    lstNewItems = 0;
+    lstNewItems = nullptr;
 
     KFileItemList *tmpMime = lstMimeFilteredItems;
-    lstMimeFilteredItems = 0;
+    lstMimeFilteredItems = nullptr;
 
     QList<QPair<KFileItem, KFileItem> > *tmpRefresh = lstRefreshItems;
-    lstRefreshItems = 0;
+    lstRefreshItems = nullptr;
 
     KFileItemList *tmpRemove = lstRemoveItems;
-    lstRemoveItems = 0;
+    lstRemoveItems = nullptr;
 
     if (tmpNew) {
         QHashIterator<QUrl, KFileItemList> it(*tmpNew);
Index: src/core/kcoredirlister_p.h
===================================================================
--- src/core/kcoredirlister_p.h
+++ src/core/kcoredirlister_p.h
@@ -112,10 +112,10 @@
 
         rootFileItem = KFileItem();
 
-        lstNewItems = 0;
-        lstRefreshItems = 0;
-        lstMimeFilteredItems = 0;
-        lstRemoveItems = 0;
+        lstNewItems = nullptr;
+        lstRefreshItems = nullptr;
+        lstMimeFilteredItems = nullptr;
+        lstRemoveItems = nullptr;
 
         hasPendingChanges = false;
     }
@@ -315,7 +315,7 @@
 
     void stopListJob(const QString &url, bool silent);
 
-    KIO::ListJob *jobForUrl(const QString &url, KIO::ListJob *not_job = 0);
+    KIO::ListJob *jobForUrl(const QString &url, KIO::ListJob *not_job = nullptr);
     const QUrl &joburl(KIO::ListJob *job);
 
     void killJob(KIO::ListJob *job);
Index: src/core/kdirnotify.h
===================================================================
--- src/core/kdirnotify.h
+++ src/core/kdirnotify.h
@@ -77,7 +77,7 @@
      * \param connection Typically QDBusConnection::sessionBus().
      * \param parent The parent QObject.
      */
-    OrgKdeKDirNotifyInterface(const QString &service, const QString &path, const QDBusConnection &connection = QDBusConnection::sessionBus(), QObject *parent = 0);
+    OrgKdeKDirNotifyInterface(const QString &service, const QString &path, const QDBusConnection &connection = QDBusConnection::sessionBus(), QObject *parent = nullptr);
 
     /**
      * Destructor.
Index: src/core/kfileitem.h
===================================================================
--- src/core/kfileitem.h
+++ src/core/kfileitem.h
@@ -489,7 +489,7 @@
      * The given boolean indicates if the returned url is local or not.
      * \since 4.6
      */
-    QUrl mostLocalUrl(bool *local = 0) const;
+    QUrl mostLocalUrl(bool *local = nullptr) const;
 
     /**
      * @deprecated since 5.0 add '&' in front of your boolean argument
Index: src/core/kfileitem.cpp
===================================================================
--- src/core/kfileitem.cpp
+++ src/core/kfileitem.cpp
@@ -450,7 +450,7 @@
 ///////
 
 KFileItem::KFileItem()
-    : d(0)
+    : d(nullptr)
 {
 }
 
@@ -1335,7 +1335,7 @@
     }
 
     if (url.isEmpty()) {
-        a.d = 0;
+        a.d = nullptr;
         return s;
     }
 
@@ -1494,7 +1494,7 @@
 
 bool KFileItem::isNull() const
 {
-    return d == 0;
+    return d == nullptr;
 }
 
 KFileItemList::KFileItemList()
Index: src/core/klocalsocket.h
===================================================================
--- src/core/klocalsocket.h
+++ src/core/klocalsocket.h
@@ -69,7 +69,7 @@
      *
      * @param parent    the parent object
      */
-    explicit KLocalSocket(QObject *parent = 0);
+    explicit KLocalSocket(QObject *parent = nullptr);
     /**
      * Destroys the KLocalSocket object and frees up any resources
      * associated. If the socket is open, it will be closed.
@@ -183,7 +183,7 @@
      *
      * @param parent     the parent object
      */
-    explicit KLocalSocketServer(QObject *parent = 0);
+    explicit KLocalSocketServer(QObject *parent = nullptr);
     /**
      * Destroys the KLocalSocketServer object and frees up any
      * resource associated. If the socket is still listening, it's
@@ -286,7 +286,7 @@
      * @returns true if a new connection has been accepted or false if
      * an error occurred or if the operation timed out.
      */
-    bool waitForNewConnection(int msec = 0, bool *timedOut = 0);
+    bool waitForNewConnection(int msec = 0, bool *timedOut = nullptr);
 
     /**
      * Returns true if a new socket can be received with
Index: src/core/klocalsocket.cpp
===================================================================
--- src/core/klocalsocket.cpp
+++ src/core/klocalsocket.cpp
@@ -114,7 +114,7 @@
       state(QAbstractSocket::UnconnectedState),
       error(QAbstractSocket::UnknownSocketError),
       type(KLocalSocket::UnknownLocalSocketType),
-      readNotifier(0)
+      readNotifier(nullptr)
 {
 }
 
@@ -199,7 +199,7 @@
         d->readNotifier->setEnabled((d->pendingConnections.size() - 1) < d->maxPendingConnections);
         return d->pendingConnections.dequeue();
     }
-    return 0;
+    return nullptr;
 }
 
 void KLocalSocketServer::incomingConnection(int descriptor)
Index: src/core/klocalsocket_unix.cpp
===================================================================
--- src/core/klocalsocket_unix.cpp
+++ src/core/klocalsocket_unix.cpp
@@ -337,7 +337,7 @@
     descriptor = -1;
 
     delete readNotifier;
-    readNotifier = 0;
+    readNotifier = nullptr;
 
     if (type == KLocalSocket::UnixSocket) {
         QFile::remove(localPath);
@@ -361,7 +361,7 @@
     FD_SET(descriptor, &readset);
 
     while (descriptor != -1) {
-        int code = ::select(descriptor + 1, &readset, 0, 0, &tv);
+        int code = ::select(descriptor + 1, &readset, nullptr, nullptr, &tv);
         if (code == -1 && errno == EINTR) {
             // interrupted
             continue;
Index: src/core/kmountpoint.cpp
===================================================================
--- src/core/kmountpoint.cpp
+++ src/core/kmountpoint.cpp
@@ -214,7 +214,7 @@
 
 #if HAVE_SETMNTENT
     STRUCT_SETMNTENT fstab;
-    if ((fstab = SETMNTENT(FSTAB, "r")) == 0) {
+    if ((fstab = SETMNTENT(FSTAB, "r")) == nullptr) {
         return result;
     }
 
@@ -416,7 +416,7 @@
 
 #else
     STRUCT_SETMNTENT mnttab;
-    if ((mnttab = SETMNTENT(MNTTAB, "r")) == 0) {
+    if ((mnttab = SETMNTENT(MNTTAB, "r")) == nullptr) {
         return result;
     }
 
Index: src/core/kprotocolmanager.cpp
===================================================================
--- src/core/kprotocolmanager.cpp
+++ src/core/kprotocolmanager.cpp
@@ -76,7 +76,7 @@
 */
 static bool revmatch(const char *host, const char *nplist)
 {
-    if (host == 0) {
+    if (host == nullptr) {
         return false;
     }
 
@@ -218,7 +218,7 @@
 
         // If the hostname does not contain a dot, check if
         // <local> is part of noProxy.
-        if (!isMatch && !host.isEmpty() && (strchr(host, '.') == NULL)) {
+        if (!isMatch && !host.isEmpty() && (strchr(host, '.') == nullptr)) {
             isMatch = revmatch("<local>", no_proxy);
         }
     }
Index: src/core/krecentdocument.cpp
===================================================================
--- src/core/krecentdocument.cpp
+++ src/core/krecentdocument.cpp
@@ -123,7 +123,7 @@
         if (tmp.desktopGroup().readPathEntry("URL", QString()) == url.toDisplayString()
             && tmp.desktopGroup().readEntry("X-KDE-LastOpenedWith") == desktopEntryName) {
             // Set access and modification time to current time
-            ::utime(QFile::encodeName(ddesktop).constData(), NULL);
+            ::utime(QFile::encodeName(ddesktop).constData(), nullptr);
             return;
         }
         // if not append a (num) to it
Index: src/core/kremoteencoding.h
===================================================================
--- src/core/kremoteencoding.h
+++ src/core/kremoteencoding.h
@@ -49,7 +49,7 @@
      * Constructs this object to use the given encoding name.
      * If @p name is a null pointer, the standard encoding will be used.
      */
-    explicit KRemoteEncoding(const char *name = 0);
+    explicit KRemoteEncoding(const char *name = nullptr);
 
     /**
      * Destructor
Index: src/core/kremoteencoding.cpp
===================================================================
--- src/core/kremoteencoding.cpp
+++ src/core/kremoteencoding.cpp
@@ -26,7 +26,7 @@
 {
 public:
     KRemoteEncodingPrivate()
-        : m_codec(0)
+        : m_codec(nullptr)
     {
     }
 
@@ -110,11 +110,11 @@
         d->m_codec = QTextCodec::codecForName(name);
     }
 
-    if (d->m_codec == 0) {
+    if (d->m_codec == nullptr) {
         d->m_codec = QTextCodec::codecForMib(106);    // fallback to UTF-8
     }
 
-    if (d->m_codec == 0) {
+    if (d->m_codec == nullptr) {
         d->m_codec = QTextCodec::codecForMib(4 /* latin-1 */);
     }
 
Index: src/core/ksambashare.cpp
===================================================================
--- src/core/ksambashare.cpp
+++ src/core/ksambashare.cpp
@@ -431,7 +431,7 @@
 }
 
 KSambaShare::KSambaShare()
-    : QObject(0)
+    : QObject(nullptr)
     , d_ptr(new KSambaSharePrivate(this))
 {
     Q_D(const KSambaShare);
Index: src/core/ksslcertificatemanager.cpp
===================================================================
--- src/core/ksslcertificatemanager.cpp
+++ src/core/ksslcertificatemanager.cpp
@@ -209,7 +209,7 @@
 KSslCertificateManagerPrivate::~KSslCertificateManagerPrivate()
 {
     delete iface;
-    iface = 0;
+    iface = nullptr;
 }
 
 void KSslCertificateManagerPrivate::loadDefaultCaCertificates()
Index: src/core/kssld_interface.h
===================================================================
--- src/core/kssld_interface.h
+++ src/core/kssld_interface.h
@@ -48,7 +48,7 @@
 public:
     OrgKdeKSSLDInterface(const QString &service, const QString &path,
                          const QDBusConnection &connection,
-                         QObject *parent = 0)
+                         QObject *parent = nullptr)
         : QDBusAbstractInterface(service, path, staticInterfaceName(), connection, parent)
     {
         registerMetaTypesForKSSLD();
Index: src/core/ktcpsocket.h
===================================================================
--- src/core/ktcpsocket.h
+++ src/core/ktcpsocket.h
@@ -223,7 +223,7 @@
         ManualProxy
     };
 
-    KTcpSocket(QObject *parent = 0);
+    KTcpSocket(QObject *parent = nullptr);
     ~KTcpSocket();
 
     //from QIODevice
Index: src/core/scheduler.cpp
===================================================================
--- src/core/scheduler.cpp
+++ src/core/scheduler.cpp
@@ -63,7 +63,7 @@
 // here be uglies
 // forward declaration to break cross-dependency of SlaveKeeper and SchedulerPrivate
 static void setupSlave(KIO::Slave *slave, const QUrl &url, const QString &protocol,
-                       const QStringList &proxyList, bool newSlave, const KIO::MetaData *config = 0);
+                       const QStringList &proxyList, bool newSlave, const KIO::MetaData *config = nullptr);
 // same reason as above
 static Scheduler *scheduler();
 static Slave *heldSlaveForJob(SimpleJob *job);
@@ -109,7 +109,7 @@
         it = m_idleSlaves.begin();
     }
     if (it == m_idleSlaves.end()) {
-        return 0;
+        return nullptr;
     }
     slave = it.value();
     m_idleSlaves.erase(it);
@@ -258,7 +258,7 @@
     const bool removedRunning = jobs.runningJob == job;
     const bool removedWaiting = jobs.waitingList.removeAll(job) != 0;
     if (removedRunning) {
-        jobs.runningJob = 0;
+        jobs.runningJob = nullptr;
         Q_ASSERT(!removedWaiting);
     }
     const bool removedTheJob = removedRunning || removedWaiting;
@@ -314,7 +314,7 @@
     if (it == m_connectedSlaves.end()) {
         return false;
     }
-    return it.value().runningJob == 0;
+    return it.value().runningJob == nullptr;
 }
 
 //private slot
@@ -650,7 +650,7 @@
 public:
     SchedulerPrivate()
         : q(new Scheduler()),
-          m_slaveOnHold(0),
+          m_slaveOnHold(nullptr),
           m_checkOnHold(true), // !! Always check with KLauncher for the first request
           m_ignoreConfigReparse(false)
     {
@@ -659,7 +659,7 @@
     ~SchedulerPrivate()
     {
         delete q;
-        q = 0;
+        q = nullptr;
         Q_FOREACH (ProtoQueue *p, m_protocols) {
             Q_FOREACH (Slave *slave, p->allSlaves()) {
                 slave->kill();
@@ -696,7 +696,7 @@
 
     MetaData metaDataFor(const QString &protocol, const QStringList &proxyList, const QUrl &url);
     void setupSlave(KIO::Slave *slave, const QUrl &url, const QString &protocol,
-                    const QStringList &proxyList, bool newSlave, const KIO::MetaData *config = 0);
+                    const QStringList &proxyList, bool newSlave, const KIO::MetaData *config = nullptr);
 
     void slotSlaveDied(KIO::Slave *slave);
     void slotSlaveStatus(qint64 pid, const QByteArray &protocol,
@@ -710,7 +710,7 @@
 
     ProtoQueue *protoQ(const QString &protocol, const QString &host)
     {
-        ProtoQueue *pq = m_protocols.value(protocol, 0);
+        ProtoQueue *pq = m_protocols.value(protocol, nullptr);
         if (!pq) {
             //qDebug() << "creating ProtoQueue instance for" << protocol;
 
@@ -1025,11 +1025,11 @@
                 }
             }
         }
-        slave->setJob(0);
+        slave->setJob(nullptr);
         slave->disconnect(job);
     }
     jobPriv->m_schedSerial = 0; // this marks the job as unscheduled again
-    jobPriv->m_slave = 0;
+    jobPriv->m_slave = nullptr;
     // Clear the values in the internal metadata container since they have
     // already been taken care of above...
     jobPriv->m_internalMetaData.clear();
@@ -1120,7 +1120,7 @@
         pq->removeSlave(slave);
     }
     if (slave == m_slaveOnHold) {
-        m_slaveOnHold = 0;
+        m_slaveOnHold = nullptr;
         m_urlOnHold.clear();
     }
     slave->deref(); // Delete slave
@@ -1133,8 +1133,8 @@
     slave->disconnect(job);
     // prevent the fake death of the slave from trying to kill the job again;
     // cf. Slave::hold(const QUrl &url) called in SchedulerPrivate::publishSlaveOnHold().
-    slave->setJob(0);
-    SimpleJobPrivate::get(job)->m_slave = 0;
+    slave->setJob(nullptr);
+    SimpleJobPrivate::get(job)->m_slave = nullptr;
 
     if (m_slaveOnHold) {
         m_slaveOnHold->kill();
@@ -1166,7 +1166,7 @@
 
 Slave *SchedulerPrivate::heldSlaveForJob(SimpleJob *job)
 {
-    Slave *slave = 0;
+    Slave *slave = nullptr;
     KIO::SimpleJobPrivate *const jobPriv = SimpleJobPrivate::get(job);
 
     if (jobPriv->m_checkOnHold) {
@@ -1197,7 +1197,7 @@
                 //qDebug() << "HOLD: Discarding held slave (" << m_slaveOnHold << ")";
                 m_slaveOnHold->kill();
             }
-            m_slaveOnHold = 0;
+            m_slaveOnHold = nullptr;
             m_urlOnHold.clear();
         }
     } else if (slave) {
@@ -1213,7 +1213,7 @@
     if (m_slaveOnHold) {
         m_slaveOnHold->kill();
     }
-    m_slaveOnHold = 0;
+    m_slaveOnHold = nullptr;
     m_urlOnHold.clear();
 }
 
@@ -1223,7 +1223,7 @@
     const QString protocol = KProtocolManager::slaveProtocol(url, proxyList);
     ProtoQueue *pq = protoQ(protocol, url.host());
 
-    Slave *slave = pq->createSlave(protocol, /* job */0, url);
+    Slave *slave = pq->createSlave(protocol, /* job */nullptr, url);
     if (slave) {
         setupSlave(slave, url, protocol, proxyList, true, &config);
         pq->m_connectedSlaveQueue.addSlave(slave);
Index: src/core/scheduler_p.h
===================================================================
--- src/core/scheduler_p.h
+++ src/core/scheduler_p.h
@@ -89,7 +89,7 @@
 };
 
 struct PerSlaveQueue {
-    PerSlaveQueue() : runningJob(0) {}
+    PerSlaveQueue() : runningJob(nullptr) {}
     QList <SimpleJob *> waitingList;
     SimpleJob *runningJob;
 };
Index: src/core/simplejob.cpp
===================================================================
--- src/core/simplejob.cpp
+++ src/core/simplejob.cpp
@@ -169,7 +169,7 @@
         m_outgoingMetaData.insert(QStringLiteral("user-timestamp"), QString::number(userTimestampProp.toULongLong()));
     }
 
-    if (q->uiDelegate() == 0) {            // not interactive
+    if (q->uiDelegate() == nullptr) {            // not interactive
         m_outgoingMetaData.insert(QStringLiteral("no-auth-prompt"), QStringLiteral("true"));
     }
 
Index: src/core/slave.h
===================================================================
--- src/core/slave.h
+++ src/core/slave.h
@@ -54,7 +54,7 @@
 {
     Q_OBJECT
 public:
-    explicit Slave(const QString &protocol, QObject *parent = 0);
+    explicit Slave(const QString &protocol, QObject *parent = nullptr);
 
     virtual ~Slave();
 
Index: src/core/slave.cpp
===================================================================
--- src/core/slave.cpp
+++ src/core/slave.cpp
@@ -127,7 +127,7 @@
         m_protocol(protocol),
         m_slaveProtocol(protocol),
         slaveconnserver(new KIO::ConnectionServer),
-        m_job(0),
+        m_job(nullptr),
         m_pid(0),
         m_port(0),
         contacted(false),
@@ -168,7 +168,7 @@
     Q_D(Slave);
     d->slaveconnserver->setNextPendingConnection(d->connection);
     d->slaveconnserver->deleteLater();
-    d->slaveconnserver = 0;
+    d->slaveconnserver = nullptr;
 
     connect(d->connection, SIGNAL(readyRead()), SLOT(gotInput()));
 }
@@ -470,7 +470,7 @@
         error_text = i18n("Can not create socket for launching io-slave for protocol '%1'.", protocol);
         error = KIO::ERR_CANNOT_CREATE_SLAVE;
         delete slave;
-        return 0;
+        return nullptr;
     }
 
     if (forkSlaves() == 1) {
@@ -479,7 +479,7 @@
             error_text = i18n("Unknown protocol '%1'.", protocol);
             error = KIO::ERR_CANNOT_CREATE_SLAVE;
             delete slave;
-            return 0;
+            return nullptr;
         }
         // find the kioslave using KPluginLoader; kioslave would do this
         // anyway, but if it doesn't exist, we want to be able to return
@@ -489,7 +489,7 @@
             error_text = i18n("Can not find io-slave for protocol '%1'.", protocol);
             error = KIO::ERR_CANNOT_CREATE_SLAVE;
             delete slave;
-            return 0;
+            return nullptr;
         }
 
         const QStringList args = QStringList() << lib_path << protocol << QLatin1String("") << slaveAddress.toString();
@@ -505,7 +505,7 @@
             error_text = i18n("Can not find 'kioslave' executable at '%1'", searchPaths.join(QStringLiteral(", ")));
             error = KIO::ERR_CANNOT_CREATE_SLAVE;
             delete slave;
-            return 0;
+            return nullptr;
 
         }
         QProcess::startDetached(kioslaveExecutable, args);
@@ -519,14 +519,14 @@
         error_text = i18n("Cannot talk to klauncher: %1", klauncher()->lastError().message());
         error = KIO::ERR_CANNOT_CREATE_SLAVE;
         delete slave;
-        return 0;
+        return nullptr;
     }
     qint64 pid = reply;
     if (!pid) {
         error_text = i18n("klauncher said: %1", errorStr);
         error = KIO::ERR_CANNOT_CREATE_SLAVE;
         delete slave;
-        return 0;
+        return nullptr;
     }
     slave->setPID(pid);
     QTimer::singleShot(1000 * SLAVE_CONNECTION_TIMEOUT_MIN, slave, SLOT(timeout()));
@@ -538,11 +538,11 @@
     //qDebug() << "holdSlave" << protocol << "for" << url;
     // Firstly take into account all special slaves
     if (protocol == QLatin1String("data")) {
-        return 0;
+        return nullptr;
     }
 
     if (forkSlaves()) {
-        return 0;
+        return nullptr;
     }
 
     Slave *slave = new Slave(protocol);
@@ -550,12 +550,12 @@
     QDBusReply<int> reply = klauncher()->requestHoldSlave(url.toString(), slaveAddress.toString());
     if (!reply.isValid()) {
         delete slave;
-        return 0;
+        return nullptr;
     }
     qint64 pid = reply;
     if (!pid) {
         delete slave;
-        return 0;
+        return nullptr;
     }
     slave->setPID(pid);
     QTimer::singleShot(1000 * SLAVE_CONNECTION_TIMEOUT_MIN, slave, SLOT(timeout()));
Index: src/core/slavebase.h
===================================================================
--- src/core/slavebase.h
+++ src/core/slavebase.h
@@ -891,7 +891,7 @@
      * Wait for an answer to our request, until we get @p expected1 or @p expected2
      * @return the result from readData, as well as the cmd in *pCmd if set, and the data in @p data
      */
-    int waitForAnswer(int expected1, int expected2, QByteArray &data, int *pCmd = 0);
+    int waitForAnswer(int expected1, int expected2, QByteArray &data, int *pCmd = nullptr);
 
     /**
      * Internal function to transmit meta data to the application.
Index: src/core/slavebase.cpp
===================================================================
--- src/core/slavebase.cpp
+++ src/core/slavebase.cpp
@@ -80,7 +80,7 @@
 {
 public:
     SlaveBase *q;
-    SlaveBasePrivate(SlaveBase *owner): q(owner), m_passwdServerClient(0)
+    SlaveBasePrivate(SlaveBase *owner): q(owner), m_passwdServerClient(nullptr)
     {
         if (!qEnvironmentVariableIsEmpty("KIOSLAVE_ENABLE_TESTMODE")) {
             QStandardPaths::enableTestMode(true);
@@ -180,7 +180,7 @@
         //qDebug()<<"kioslave : exiting due to signal "<<sigNumber;
         //set the flag which will be checked in dispatchLoop() and which *should* be checked
         //in lengthy operations in the various slaves
-        if (globalSlave != 0) {
+        if (globalSlave != nullptr) {
             globalSlave->setKillFlag();
         }
         ::signal(SIGALRM, SIG_DFL);
@@ -231,7 +231,7 @@
     act.sa_handler = sigpipe_handler;
     sigemptyset(&act.sa_mask);
     act.sa_flags = 0;
-    sigaction(SIGPIPE, &act, 0);
+    sigaction(SIGPIPE, &act, nullptr);
 
     ::signal(SIGINT, &genericsig_handler);
     ::signal(SIGQUIT, &genericsig_handler);
@@ -256,7 +256,7 @@
     d->totalSize = 0;
     connectSlave(QFile::decodeName(app_socket));
 
-    d->remotefile = 0;
+    d->remotefile = nullptr;
     d->inOpenLoop = false;
     d->exit_loop = false;
 }
@@ -324,11 +324,11 @@
         }
 
         // execute deferred deletes
-        QCoreApplication::sendPostedEvents(NULL, QEvent::DeferredDelete);
+        QCoreApplication::sendPostedEvents(nullptr, QEvent::DeferredDelete);
     }
 
     // execute deferred deletes
-    QCoreApplication::sendPostedEvents(NULL, QEvent::DeferredDelete);
+    QCoreApplication::sendPostedEvents(nullptr, QEvent::DeferredDelete);
 }
 
 void SlaveBase::connectSlave(const QString &address)
@@ -928,7 +928,7 @@
 void SlaveBase::reparseConfiguration()
 {
     delete d->remotefile;
-    d->remotefile = 0;
+    d->remotefile = nullptr;
 }
 
 bool SlaveBase::openPasswordDialog(AuthInfo &info, const QString &errorMsg)
@@ -1096,7 +1096,7 @@
         disconnectSlave();
         d->isConnectedToApp = true;
         connectSlave(app_socket);
-        virtual_hook(AppConnectionMade, 0);
+        virtual_hook(AppConnectionMade, nullptr);
     } break;
     case CMD_SLAVE_HOLD: {
         QUrl url;
@@ -1119,7 +1119,7 @@
         stream >> d->configData;
         d->rebuildConfig();
         delete d->remotefile;
-        d->remotefile = 0;
+        d->remotefile = nullptr;
     } break;
     case CMD_GET: {
         stream >> url;
Index: src/core/slaveconfig.cpp
===================================================================
--- src/core/slaveconfig.cpp
+++ src/core/slaveconfig.cpp
@@ -75,7 +75,7 @@
 
 SlaveConfigProtocol *SlaveConfigPrivate::readProtocolConfig(const QString &_protocol)
 {
-    SlaveConfigProtocol *scp = protocol.value(_protocol, 0);
+    SlaveConfigProtocol *scp = protocol.value(_protocol, nullptr);
     if (!scp) {
         QString filename = KProtocolInfo::config(_protocol);
         scp = new SlaveConfigProtocol;
@@ -89,7 +89,7 @@
 
 SlaveConfigProtocol *SlaveConfigPrivate::findProtocolConfig(const QString &_protocol)
 {
-    SlaveConfigProtocol *scp = protocol.value(_protocol, 0);
+    SlaveConfigProtocol *scp = protocol.value(_protocol, nullptr);
     if (!scp) {
         scp = readProtocolConfig(_protocol);
     }
Index: src/core/slaveinterface.h
===================================================================
--- src/core/slaveinterface.h
+++ src/core/slaveinterface.h
@@ -100,7 +100,7 @@
     Q_OBJECT
 
 protected:
-    SlaveInterface(SlaveInterfacePrivate &dd, QObject *parent = 0);
+    SlaveInterface(SlaveInterfacePrivate &dd, QObject *parent = nullptr);
 public:
 
     virtual ~SlaveInterface();
Index: src/core/slaveinterface_p.h
===================================================================
--- src/core/slaveinterface_p.h
+++ src/core/slaveinterface_p.h
@@ -38,7 +38,7 @@
 {
 public:
     SlaveInterfacePrivate()
-        : connection(0), filesize(0), offset(0), last_time(0), start_time(0),
+        : connection(nullptr), filesize(0), offset(0), last_time(0), start_time(0),
           nums(0), slave_calcs_speed(false)
     {
     }
Index: src/core/storedtransferjob.cpp
===================================================================
--- src/core/storedtransferjob.cpp
+++ src/core/storedtransferjob.cpp
@@ -271,7 +271,7 @@
 
     if (_error) {
         static bool override_loaded = false;
-        static QList< int > *overriden_ports = NULL;
+        static QList< int > *overriden_ports = nullptr;
         if (!override_loaded) {
             KConfig cfg(QStringLiteral("kio_httprc"));
             overriden_ports = new QList< int >;
@@ -315,7 +315,7 @@
     }
 
     // all is ok, return 0
-    return 0;
+    return nullptr;
 }
 
 static KIO::PostErrorJob *precheckHttpPost(const QUrl &url, const QByteArray &postData, JobFlags flags)
@@ -334,7 +334,7 @@
     }
 
     // all is ok, return 0
-    return 0;
+    return nullptr;
 }
 
 TransferJob *KIO::http_post(const QUrl &url, const QByteArray &postData, JobFlags flags)
Index: src/core/tcpslavebase.h
===================================================================
--- src/core/tcpslavebase.h
+++ src/core/tcpslavebase.h
@@ -128,7 +128,7 @@
      *
      * @since 4.7.2
      */
-    int connectToHost(const QString &host, quint16 port, QString *errorString = 0);
+    int connectToHost(const QString &host, quint16 port, QString *errorString = nullptr);
 
     /**
      * the current port for this service
Index: src/core/transferjob.cpp
===================================================================
--- src/core/transferjob.cpp
+++ src/core/transferjob.cpp
@@ -459,7 +459,7 @@
     SimpleJob::slotResult(job);
 
     if (!error() && job == d->m_subJob) {
-        d->m_subJob = 0; // No action required
+        d->m_subJob = nullptr; // No action required
         d->internalResume(); // Make sure we get the remaining data.
     }
 }
Index: src/core/usernotificationhandler.cpp
===================================================================
--- src/core/usernotificationhandler.cpp
+++ src/core/usernotificationhandler.cpp
@@ -79,7 +79,7 @@
         if (m_cachedResults.contains(key)) {
             result = *(m_cachedResults[key]);
         } else {
-            JobUiDelegateExtension *delegateExtension = 0;
+            JobUiDelegateExtension *delegateExtension = nullptr;
             if (r->slave->job())
                 delegateExtension = SimpleJobPrivate::get(r->slave->job())->m_uiDelegateExtension;
             if (!delegateExtension)
Index: src/core/usernotificationhandler_p.h
===================================================================
--- src/core/usernotificationhandler_p.h
+++ src/core/usernotificationhandler_p.h
@@ -56,7 +56,7 @@
         QHash<MessageBoxDataType, QVariant> data;
     };
 
-    UserNotificationHandler(QObject *parent = 0);
+    UserNotificationHandler(QObject *parent = nullptr);
     virtual ~UserNotificationHandler();
 
     void requestMessageBox(SlaveInterface *iface, int type, const QHash<MessageBoxDataType, QVariant> &data);
Index: src/filewidgets/kdiroperator.h
===================================================================
--- src/filewidgets/kdiroperator.h
+++ src/filewidgets/kdiroperator.h
@@ -122,7 +122,7 @@
      * This constructor doesn't start loading the url, setView will do it.
      */
     explicit KDirOperator(const QUrl &urlName  = QUrl(),
-                          QWidget *parent = 0);
+                          QWidget *parent = nullptr);
     /**
      * Destroys the KDirOperator.
      */
@@ -506,7 +506,7 @@
      * @param ask specifies whether a confirmation dialog should be shown
      * @param showProgress passed to the DeleteJob to show a progress dialog
      */
-    virtual KIO::DeleteJob *del(const KFileItemList &items, QWidget *parent = 0,
+    virtual KIO::DeleteJob *del(const KFileItemList &items, QWidget *parent = nullptr,
                                 bool ask = true, bool showProgress = true);
 
     /**
Index: src/filewidgets/kdiroperator.cpp
===================================================================
--- src/filewidgets/kdiroperator.cpp
+++ src/filewidgets/kdiroperator.cpp
@@ -75,7 +75,7 @@
 {
     Q_OBJECT
 public:
-    KDirOperatorIconView(KDirOperator *dirOperator, QWidget *parent = 0);
+    KDirOperatorIconView(KDirOperator *dirOperator, QWidget *parent = nullptr);
     virtual ~KDirOperatorIconView();
 
 protected:
@@ -292,30 +292,30 @@
 
 KDirOperator::Private::Private(KDirOperator *_parent) :
     parent(_parent),
-    dirLister(0),
+    dirLister(nullptr),
     decorationPosition(QStyleOptionViewItem::Left),
-    splitter(0),
-    itemView(0),
-    dirModel(0),
-    proxyModel(0),
-    progressBar(0),
-    preview(0),
+    splitter(nullptr),
+    itemView(nullptr),
+    dirModel(nullptr),
+    proxyModel(nullptr),
+    progressBar(nullptr),
+    preview(nullptr),
     previewUrl(),
     previewWidth(0),
     dirHighlighting(false),
     onlyDoubleClickSelectsFiles(!qApp->style()->styleHint(QStyle::SH_ItemView_ActivateItemOnSingleClick)),
-    progressDelayTimer(0),
+    progressDelayTimer(nullptr),
     dropOptions(0),
-    actionMenu(0),
-    actionCollection(0),
-    newFileMenu(0),
-    configGroup(0),
-    previewGenerator(0),
+    actionMenu(nullptr),
+    actionCollection(nullptr),
+    newFileMenu(nullptr),
+    configGroup(nullptr),
+    previewGenerator(nullptr),
     showPreviews(false),
     iconsZoom(0),
     isSaving(false),
-    decorationMenu(0),
-    leftAction(0),
+    decorationMenu(nullptr),
+    leftAction(nullptr),
     shouldFetchForItems(false),
     inlinePreviewState(NotForced)
 {
@@ -324,7 +324,7 @@
 KDirOperator::Private::~Private()
 {
     delete itemView;
-    itemView = 0;
+    itemView = nullptr;
 
     // TODO:
     // if (configGroup) {
@@ -334,18 +334,18 @@
     qDeleteAll(backStack);
     qDeleteAll(forwardStack);
     delete preview;
-    preview = 0;
+    preview = nullptr;
 
     delete proxyModel;
-    proxyModel = 0;
+    proxyModel = nullptr;
     delete dirModel;
-    dirModel = 0;
-    dirLister = 0; // deleted by KDirModel
+    dirModel = nullptr;
+    dirLister = nullptr; // deleted by KDirModel
     delete configGroup;
-    configGroup = 0;
+    configGroup = nullptr;
 
     delete progressDelayTimer;
-    progressDelayTimer = 0;
+    progressDelayTimer = nullptr;
 }
 
 KDirOperator::KDirOperator(const QUrl &_url, QWidget *parent) :
@@ -357,7 +357,7 @@
     connect(d->splitter, SIGNAL(splitterMoved(int,int)),
             this, SLOT(_k_slotSplitterMoved(int,int)));
 
-    d->preview = 0;
+    d->preview = nullptr;
 
     d->mode = KFile::File;
     d->viewKind = KFile::Simple;
@@ -409,7 +409,7 @@
 KDirOperator::~KDirOperator()
 {
     resetCursor();
-    disconnect(d->dirLister, 0, this, 0);
+    disconnect(d->dirLister, nullptr, this, nullptr);
     delete d;
 }
 
@@ -483,7 +483,7 @@
 
 void KDirOperator::toggleIgnoreCase()
 {
-    if (d->proxyModel != 0) {
+    if (d->proxyModel != nullptr) {
         Qt::CaseSensitivity cs = d->proxyModel->sortCaseSensitivity();
         cs = (cs == Qt::CaseSensitive) ? Qt::CaseInsensitive : Qt::CaseSensitive;
         d->proxyModel->setSortCaseSensitivity(cs);
@@ -492,7 +492,7 @@
 
 void KDirOperator::updateSelectionDependentActions()
 {
-    const bool hasSelection = (d->itemView != 0) &&
+    const bool hasSelection = (d->itemView != nullptr) &&
                               d->itemView->selectionModel()->hasSelection();
     d->actionCollection->action(QStringLiteral("trash"))->setEnabled(hasSelection);
     d->actionCollection->action(QStringLiteral("delete"))->setEnabled(hasSelection);
@@ -501,7 +501,7 @@
 
 void KDirOperator::setPreviewWidget(KPreviewWidgetBase *w)
 {
-    const bool showPreview = (w != 0);
+    const bool showPreview = (w != nullptr);
     if (showPreview) {
         d->viewKind = (d->viewKind | KFile::PreviewContents);
     } else {
@@ -524,7 +524,7 @@
 KFileItemList KDirOperator::selectedItems() const
 {
     KFileItemList itemList;
-    if (d->itemView == 0) {
+    if (d->itemView == nullptr) {
         return itemList;
     }
 
@@ -543,7 +543,7 @@
 
 bool KDirOperator::isSelected(const KFileItem &item) const
 {
-    if ((item.isNull()) || (d->itemView == 0)) {
+    if ((item.isNull()) || (d->itemView == nullptr)) {
         return false;
     }
 
@@ -554,12 +554,12 @@
 
 int KDirOperator::numDirs() const
 {
-    return (d->dirLister == 0) ? 0 : d->dirLister->directories().count();
+    return (d->dirLister == nullptr) ? 0 : d->dirLister->directories().count();
 }
 
 int KDirOperator::numFiles() const
 {
-    return (d->dirLister == 0) ? 0 : d->dirLister->items().count() - numDirs();
+    return (d->dirLister == nullptr) ? 0 : d->dirLister->items().count() - numDirs();
 }
 
 KCompletion *KDirOperator::completionObject() const
@@ -617,7 +617,7 @@
 {
     if (on) {
         viewKind = viewKind | KFile::PreviewContents;
-        if (preview == 0) {
+        if (preview == nullptr) {
             preview = new KFileMetaPreview(parent);
             actionCollection->action(QStringLiteral("preview"))->setChecked(true);
             splitter->addWidget(preview);
@@ -626,13 +626,13 @@
         preview->show();
 
         QMetaObject::invokeMethod(parent, "_k_assureVisibleSelection", Qt::QueuedConnection);
-        if (itemView != 0) {
+        if (itemView != nullptr) {
             const QModelIndex index = itemView->selectionModel()->currentIndex();
             if (index.isValid()) {
                 _k_triggerPreview(index);
             }
         }
-    } else if (preview != 0) {
+    } else if (preview != nullptr) {
         viewKind = viewKind & ~KFile::PreviewContents;
         preview->hide();
     }
@@ -769,10 +769,10 @@
         KMessageBox::information(parent,
                                  i18n("You did not select a file to delete."),
                                  i18n("Nothing to Delete"));
-        return 0L;
+        return nullptr;
     }
 
-    if (parent == 0) {
+    if (parent == nullptr) {
         parent = this;
     }
 
@@ -793,7 +793,7 @@
         return job;
     }
 
-    return 0L;
+    return nullptr;
 }
 
 void KDirOperator::deleteSelected()
@@ -812,7 +812,7 @@
         KMessageBox::information(parent,
                                  i18n("You did not select a file to trash."),
                                  i18n("Nothing to Trash"));
-        return 0L;
+        return nullptr;
     }
 
     const QList<QUrl> urls = items.urlList();
@@ -832,7 +832,7 @@
         return job;
     }
 
-    return 0L;
+    return nullptr;
 }
 
 KFilePreviewGenerator *KDirOperator::previewGenerator() const
@@ -867,7 +867,7 @@
 
 void KDirOperator::trashSelected()
 {
-    if (d->itemView == 0) {
+    if (d->itemView == nullptr) {
         return;
     }
 
@@ -1116,7 +1116,7 @@
     // - connect KDirOperatorDetailView() with this signal and update the
     //   header internally
     QTreeView *treeView = qobject_cast<QTreeView *>(itemView);
-    if (treeView != 0) {
+    if (treeView != nullptr) {
         QHeaderView *headerView = treeView->header();
         headerView->blockSignals(true);
         headerView->setSortIndicator(sortColumn(), sortOrder());
@@ -1129,7 +1129,7 @@
 // Protected
 void KDirOperator::pathChanged()
 {
-    if (d->itemView == 0) {
+    if (d->itemView == nullptr) {
         return;
     }
 
@@ -1316,7 +1316,7 @@
     }
     break;
     case QEvent::MouseButtonRelease: {
-        if (d->preview != 0 && !d->preview->isHidden()) {
+        if (d->preview != nullptr && !d->preview->isHidden()) {
             const QModelIndex hoveredIndex = d->itemView->indexAt(d->itemView->viewport()->mapFromGlobal(QCursor::pos()));
             const QModelIndex focusedIndex = d->itemView->selectionModel() ? d->itemView->selectionModel()->currentIndex()
                                              : QModelIndex();
@@ -1424,7 +1424,7 @@
 
 QAbstractItemView *KDirOperator::createView(QWidget *parent, KFile::FileView viewKind)
 {
-    QAbstractItemView *itemView = 0;
+    QAbstractItemView *itemView = nullptr;
     if (KFile::isDetailView(viewKind) || KFile::isTreeView(viewKind) || KFile::isDetailTreeView(viewKind)) {
         KDirOperatorDetailView *detailView = new KDirOperatorDetailView(parent);
         detailView->setViewMode(viewKind);
@@ -1507,7 +1507,7 @@
     d->dirLister->setDirOnlyMode(dirOnlyMode());
 
     // reset the view with the different mode
-    if (d->itemView != 0) {
+    if (d->itemView != nullptr) {
         setView(static_cast<KFile::FileView>(d->viewKind));
     }
 }
@@ -1520,7 +1520,7 @@
 
     // TODO: do a real timer and restart it after that
     d->pendingMimeTypes.clear();
-    const bool listDir = (d->itemView == 0);
+    const bool listDir = (d->itemView == nullptr);
 
     if (d->mode & KFile::Files) {
         view->setSelectionMode(QAbstractItemView::ExtendedSelection);
@@ -1528,8 +1528,8 @@
         view->setSelectionMode(QAbstractItemView::SingleSelection);
     }
 
-    QItemSelectionModel *selectionModel = 0;
-    if ((d->itemView != 0) && d->itemView->selectionModel()->hasSelection()) {
+    QItemSelectionModel *selectionModel = nullptr;
+    if ((d->itemView != nullptr) && d->itemView->selectionModel()->hasSelection()) {
         // remember the selection of the current item view and apply this selection
         // to the new view later
         const QItemSelection selection = d->itemView->selectionModel()->selection();
@@ -1537,7 +1537,7 @@
         selectionModel->select(selection, QItemSelectionModel::Select);
     }
 
-    setFocusProxy(0);
+    setFocusProxy(nullptr);
     delete d->itemView;
     d->itemView = view;
     d->itemView->setModel(d->proxyModel);
@@ -1579,7 +1579,7 @@
         d->openUrl(d->currUrl);
     }
 
-    if (selectionModel != 0) {
+    if (selectionModel != nullptr) {
         d->itemView->setSelectionModel(selectionModel);
         QMetaObject::invokeMethod(this, "_k_assureVisibleSelection", Qt::QueuedConnection);
     }
@@ -1629,10 +1629,10 @@
     }
 
     delete d->dirModel;
-    d->dirModel = 0;
+    d->dirModel = nullptr;
 
     delete d->proxyModel;
-    d->proxyModel = 0;
+    d->proxyModel = nullptr;
 
     //delete d->dirLister; // deleted by KDirModel already, which took ownership
     d->dirLister = lister;
@@ -1684,7 +1684,7 @@
 
 void KDirOperator::highlightFile(const KFileItem &item)
 {
-    if ((d->preview != 0 && !d->preview->isHidden()) && !item.isNull()) {
+    if ((d->preview != nullptr && !d->preview->isHidden()) && !item.isNull()) {
         d->preview->showPreview(item.url());
     }
 
@@ -1750,7 +1750,7 @@
 {
     // qDebug();
 
-    if (d->itemView == 0) {
+    if (d->itemView == nullptr) {
         return;
     }
 
@@ -1795,7 +1795,7 @@
 
 void KDirOperator::prepareCompletionObjects()
 {
-    if (d->itemView == 0) {
+    if (d->itemView == nullptr) {
         return;
     }
 
@@ -2153,7 +2153,7 @@
     bool appSpecificPreview = false;
     if (d->preview) {
         KFileMetaPreview *tmp = dynamic_cast<KFileMetaPreview *>(d->preview);
-        appSpecificPreview = (tmp == 0);
+        appSpecificPreview = (tmp == nullptr);
     }
 
     if (!appSpecificPreview) {
@@ -2322,7 +2322,7 @@
 
 void KDirOperator::Private::_k_slotProperties()
 {
-    if (itemView == 0) {
+    if (itemView == nullptr) {
         return;
     }
 
@@ -2352,7 +2352,7 @@
 
 void KDirOperator::Private::_k_slotSelectionChanged()
 {
-    if (itemView == 0) {
+    if (itemView == nullptr) {
         return;
     }
 
@@ -2385,7 +2385,7 @@
 
 void KDirOperator::Private::_k_triggerPreview(const QModelIndex &index)
 {
-    if ((preview != 0 && !preview->isHidden()) && index.isValid() && (index.column() == KDirModel::Name)) {
+    if ((preview != nullptr && !preview->isHidden()) && index.isValid() && (index.column() == KDirModel::Name)) {
         const QModelIndex dirIndex = proxyModel->mapToSource(index);
         const KFileItem item = dirModel->itemForIndex(dirIndex);
 
@@ -2404,7 +2404,7 @@
 
 void KDirOperator::Private::_k_showPreview()
 {
-    if (preview != 0) {
+    if (preview != nullptr) {
         preview->showPreview(previewUrl);
     }
 }
@@ -2420,7 +2420,7 @@
 
 void KDirOperator::Private::_k_assureVisibleSelection()
 {
-    if (itemView == 0) {
+    if (itemView == nullptr) {
         return;
     }
 
Index: src/filewidgets/kdiroperatordetailview_p.h
===================================================================
--- src/filewidgets/kdiroperatordetailview_p.h
+++ src/filewidgets/kdiroperatordetailview_p.h
@@ -34,7 +34,7 @@
     Q_OBJECT
 
 public:
-    KDirOperatorDetailView(QWidget *parent = 0);
+    KDirOperatorDetailView(QWidget *parent = nullptr);
     virtual ~KDirOperatorDetailView();
     void setModel(QAbstractItemModel *model) Q_DECL_OVERRIDE;
 
Index: src/filewidgets/kdirsortfilterproxymodel.h
===================================================================
--- src/filewidgets/kdirsortfilterproxymodel.h
+++ src/filewidgets/kdirsortfilterproxymodel.h
@@ -53,7 +53,7 @@
     Q_OBJECT
 
 public:
-    KDirSortFilterProxyModel(QObject *parent = 0);
+    KDirSortFilterProxyModel(QObject *parent = nullptr);
     virtual ~KDirSortFilterProxyModel();
 
     /** Reimplemented from QAbstractItemModel. Returns true for directories. */
Index: src/filewidgets/kencodingfiledialog.h
===================================================================
--- src/filewidgets/kencodingfiledialog.h
+++ src/filewidgets/kencodingfiledialog.h
@@ -78,7 +78,7 @@
     static KIOFILEWIDGETS_EXPORT Result getOpenFileNameAndEncoding(const QString &encoding = QString(),
             const QUrl &startDir = QUrl(),
             const QString &filter = QString(),
-            QWidget *parent = 0,
+            QWidget *parent = nullptr,
             const QString &caption = QString());
 
     /**
@@ -110,7 +110,7 @@
     static KIOFILEWIDGETS_EXPORT Result getOpenFileNamesAndEncoding(const QString &encoding = QString(),
             const QUrl &startDir = QUrl(),
             const QString &filter = QString(),
-            QWidget *parent = 0,
+            QWidget *parent = nullptr,
             const QString &caption = QString());
 
     /**
@@ -142,7 +142,7 @@
     static KIOFILEWIDGETS_EXPORT Result getOpenUrlAndEncoding(const QString &encoding = QString(),
             const QUrl &startDir = QUrl(),
             const QString &filter = QString(),
-            QWidget *parent = 0,
+            QWidget *parent = nullptr,
             const QString &caption = QString());
 
     /**
@@ -174,7 +174,7 @@
     static KIOFILEWIDGETS_EXPORT Result getOpenUrlsAndEncoding(const QString &encoding = QString(),
             const QUrl &startDir = QUrl(),
             const QString &filter = QString(),
-            QWidget *parent = 0,
+            QWidget *parent = nullptr,
             const QString &caption = QString());
 
     /**
@@ -208,7 +208,7 @@
     static KIOFILEWIDGETS_EXPORT Result getSaveFileNameAndEncoding(const QString &encoding = QString(),
             const QUrl &startDir = QUrl(),
             const QString &filter = QString(),
-            QWidget *parent = 0,
+            QWidget *parent = nullptr,
             const QString &caption = QString());
 
     /**
@@ -242,7 +242,7 @@
     static KIOFILEWIDGETS_EXPORT Result getSaveUrlAndEncoding(const QString &encoding = QString(),
             const QUrl &startDir = QUrl(),
             const QString &filter = QString(),
-            QWidget *parent = 0,
+            QWidget *parent = nullptr,
             const QString &caption = QString());
 
     QSize sizeHint() const Q_DECL_OVERRIDE;
@@ -292,7 +292,7 @@
                         const QString &filter = QString(),
                         const QString &caption = QString(),
                         QFileDialog::AcceptMode type = QFileDialog::AcceptOpen,
-                        QWidget *parent = 0);
+                        QWidget *parent = nullptr);
     /**
      * Destructs the file dialog.
      */
Index: src/filewidgets/kfilecopytomenu.cpp
===================================================================
--- src/filewidgets/kfilecopytomenu.cpp
+++ src/filewidgets/kfilecopytomenu.cpp
@@ -94,7 +94,7 @@
 
 KFileCopyToMainMenu::KFileCopyToMainMenu(QMenu *parent, KFileCopyToMenuPrivate *_d, MenuType menuType)
     : QMenu(parent), m_menuType(menuType),
-      m_actionGroup(static_cast<QWidget *>(0)),
+      m_actionGroup(static_cast<QWidget *>(nullptr)),
       d(_d),
       m_recentDirsGroup(KSharedConfig::openConfig(), m_menuType == Copy ? "kuick-copy" : "kuick-move")
 {
Index: src/filewidgets/kfilefiltercombo.h
===================================================================
--- src/filewidgets/kfilefiltercombo.h
+++ src/filewidgets/kfilefiltercombo.h
@@ -36,7 +36,7 @@
      *
      * @param parent The parent widget.
      */
-    KFileFilterCombo(QWidget *parent = 0);
+    KFileFilterCombo(QWidget *parent = nullptr);
 
     /**
      * Destroys the filter combo box.
Index: src/filewidgets/kfilemetapreview.cpp
===================================================================
--- src/filewidgets/kfilemetapreview.cpp
+++ src/filewidgets/kfilemetapreview.cpp
@@ -84,7 +84,7 @@
         }
     }
 
-    return 0;
+    return nullptr;
 }
 
 KPreviewWidgetBase *KFileMetaPreview::previewProviderFor(const QString &mimeType)
@@ -96,7 +96,7 @@
     // often the first highlighted item, where we can be sure, there is no plugin
     // (this "folders reflect icons" is a konq-specific thing, right?)
     if (mimeInfo.inherits(QStringLiteral("inode/directory"))) {
-        return 0L;
+        return nullptr;
     }
 
     KPreviewWidgetBase *provider = findExistingProvider(mimeType, mimeInfo);
@@ -135,7 +135,7 @@
     // The logic in this code duplicates the logic in PreviewJob.
     // But why do we need multiple KPreviewWidgetBase instances anyway?
 
-    return 0L;
+    return nullptr;
 }
 
 void KFileMetaPreview::showPreview(const QUrl &url)
@@ -189,7 +189,7 @@
     if (!factory) {
         qWarning() << "Couldn't load kfileaudiopreview" << loader.errorString();
         s_tryAudioPreview = false;
-        return 0L;
+        return nullptr;
     }
     KPreviewWidgetBase *w = factory->create<KPreviewWidgetBase>(parent);
     if (w) {
Index: src/filewidgets/kfileplaceeditdialog.h
===================================================================
--- src/filewidgets/kfileplaceeditdialog.h
+++ src/filewidgets/kfileplaceeditdialog.h
@@ -68,7 +68,7 @@
                                QString &label, QString &icon,
                                bool isAddingNewPlace,
                                bool &appLocal, int iconSize,
-                               QWidget *parent = 0);
+                               QWidget *parent = nullptr);
 
     /**
      * Constructs a KFilePlaceEditDialog.
@@ -92,7 +92,7 @@
                          bool isAddingNewPlace,
                          bool appLocal = true,
                          int iconSize = KIconLoader::SizeMedium,
-                         QWidget *parent = 0);
+                         QWidget *parent = nullptr);
     /**
      * Destroys the dialog.
      */
Index: src/filewidgets/kfileplaceeditdialog.cpp
===================================================================
--- src/filewidgets/kfileplaceeditdialog.cpp
+++ src/filewidgets/kfileplaceeditdialog.cpp
@@ -147,7 +147,7 @@
                                       appName));
         box->addWidget(m_appLocal);
     } else {
-        m_appLocal = 0L;
+        m_appLocal = nullptr;
     }
     connect(m_urlEdit->lineEdit(), SIGNAL(textChanged(QString)), this, SLOT(urlChanged(QString)));
     if (!label.isEmpty()) {
Index: src/filewidgets/kfileplacesitem.cpp
===================================================================
--- src/filewidgets/kfileplacesitem.cpp
+++ src/filewidgets/kfileplacesitem.cpp
@@ -120,10 +120,10 @@
             m_disc = m_device.as<Solid::OpticalDisc>();
             m_mtp = m_device.as<Solid::PortableMediaPlayer>();
         } else {
-            m_access = 0;
-            m_volume = 0;
-            m_disc = 0;
-            m_mtp = 0;
+            m_access = nullptr;
+            m_volume = nullptr;
+            m_disc = nullptr;
+            m_mtp = nullptr;
         }
     }
     return m_device;
@@ -209,13 +209,13 @@
             }
 
         case KFilePlacesModel::FixedDeviceRole: {
-            Solid::StorageDrive *drive = 0;
+            Solid::StorageDrive *drive = nullptr;
             Solid::Device parentDevice = m_device;
             while (parentDevice.isValid() && !drive) {
                 drive = parentDevice.as<Solid::StorageDrive>();
                 parentDevice = parentDevice.parent();
             }
-            if (drive != 0) {
+            if (drive != nullptr) {
                 return !drive->isHotpluggable() && !drive->isRemovable();
             }
             return true;
Index: src/filewidgets/kfileplacesitem_p.h
===================================================================
--- src/filewidgets/kfileplacesitem_p.h
+++ src/filewidgets/kfileplacesitem_p.h
@@ -58,7 +58,7 @@
                                     const QString &label,
                                     const QUrl &url,
                                     const QString &iconName,
-                                    KFilePlacesItem *after = 0);
+                                    KFilePlacesItem *after = nullptr);
     static KBookmark createSystemBookmark(KBookmarkManager *manager,
                                           const QString &untranslatedLabel,
                                           const QString &translatedLabel,
Index: src/filewidgets/kfileplacesmodel.h
===================================================================
--- src/filewidgets/kfileplacesmodel.h
+++ src/filewidgets/kfileplacesmodel.h
@@ -48,7 +48,7 @@
         CapacityBarRecommendedRole = 0x1548C5C4
     };
 
-    KFilePlacesModel(QObject *parent = 0);
+    KFilePlacesModel(QObject *parent = nullptr);
     ~KFilePlacesModel();
 
     QUrl url(const QModelIndex &index) const;
Index: src/filewidgets/kfileplacesmodel.cpp
===================================================================
--- src/filewidgets/kfileplacesmodel.cpp
+++ src/filewidgets/kfileplacesmodel.cpp
@@ -59,7 +59,7 @@
 class KFilePlacesModel::Private
 {
 public:
-    Private(KFilePlacesModel *self) : q(self), bookmarkManager(0) {}
+    Private(KFilePlacesModel *self) : q(self), bookmarkManager(nullptr) {}
     ~Private()
     {
         qDeleteAll(items);
@@ -768,14 +768,14 @@
 
         Solid::StorageDrive *drive = device.as<Solid::StorageDrive>();
 
-        if (drive == 0) {
+        if (drive == nullptr) {
             drive = device.parent().as<Solid::StorageDrive>();
         }
 
         bool hotpluggable = false;
         bool removable = false;
 
-        if (drive != 0) {
+        if (drive != nullptr) {
             hotpluggable = drive->isHotpluggable();
             removable = drive->isRemovable();
         }
@@ -795,13 +795,13 @@
         }
 
         if (!iconName.isEmpty()) {
-            return new QAction(QIcon::fromTheme(iconName), text, 0);
+            return new QAction(QIcon::fromTheme(iconName), text, nullptr);
         } else {
-            return new QAction(text, 0);
+            return new QAction(text, nullptr);
         }
     }
 
-    return 0;
+    return nullptr;
 }
 
 QAction *KFilePlacesModel::ejectActionForIndex(const QModelIndex &index) const
@@ -813,10 +813,10 @@
         QString label = data(index, Qt::DisplayRole).toString().replace('&', QLatin1String("&&"));
         QString text = i18n("&Eject '%1'", label);
 
-        return new QAction(QIcon::fromTheme(QStringLiteral("media-eject")), text, 0);
+        return new QAction(QIcon::fromTheme(QStringLiteral("media-eject")), text, nullptr);
     }
 
-    return 0;
+    return nullptr;
 }
 
 void KFilePlacesModel::requestTeardown(const QModelIndex &index)
@@ -824,7 +824,7 @@
     Solid::Device device = deviceForIndex(index);
     Solid::StorageAccess *access = device.as<Solid::StorageAccess>();
 
-    if (access != 0) {
+    if (access != nullptr) {
         connect(access, SIGNAL(teardownDone(Solid::ErrorType,QVariant,QString)),
                 this, SLOT(_k_storageTeardownDone(Solid::ErrorType,QVariant)));
 
@@ -838,7 +838,7 @@
 
     Solid::OpticalDrive *drive = device.parent().as<Solid::OpticalDrive>();
 
-    if (drive != 0) {
+    if (drive != nullptr) {
         connect(drive, SIGNAL(ejectDone(Solid::ErrorType,QVariant,QString)),
                 this, SLOT(_k_storageTeardownDone(Solid::ErrorType,QVariant)));
 
Index: src/filewidgets/kfileplacesview.h
===================================================================
--- src/filewidgets/kfileplacesview.h
+++ src/filewidgets/kfileplacesview.h
@@ -35,7 +35,7 @@
 {
     Q_OBJECT
 public:
-    KFilePlacesView(QWidget *parent = 0);
+    KFilePlacesView(QWidget *parent = nullptr);
     ~KFilePlacesView();
 
     /**
Index: src/filewidgets/kfileplacesview.cpp
===================================================================
--- src/filewidgets/kfileplacesview.cpp
+++ src/filewidgets/kfileplacesview.cpp
@@ -283,7 +283,7 @@
 
 void KFilePlacesViewDelegate::removeFadeAnimation(const QModelIndex &index)
 {
-    QTimeLine *timeLine = m_timeLineMap.value(index, 0);
+    QTimeLine *timeLine = m_timeLineMap.value(index, nullptr);
     m_timeLineMap.remove(index);
     m_timeLineInverseMap.remove(timeLine);
 }
@@ -295,7 +295,7 @@
 
 QTimeLine *KFilePlacesViewDelegate::fadeAnimationForIndex(const QModelIndex &index) const
 {
-    return m_timeLineMap.value(index, 0);
+    return m_timeLineMap.value(index, nullptr);
 }
 
 qreal KFilePlacesViewDelegate::contentsOpacity(const QModelIndex &index) const
@@ -369,7 +369,7 @@
     d->dropOnPlace = false;
     d->autoResizeItems = true;
     d->dragging = false;
-    d->lastClickedStorage = 0;
+    d->lastClickedStorage = nullptr;
     d->pollingRequestCount = 0;
     d->delegate = new KFilePlacesViewDelegate(this);
 
@@ -461,7 +461,7 @@
     QUrl oldUrl = d->currentUrl;
     KFilePlacesModel *placesModel = qobject_cast<KFilePlacesModel *>(model());
 
-    if (placesModel == 0) {
+    if (placesModel == nullptr) {
         return;
     }
 
@@ -507,7 +507,7 @@
 {
     KFilePlacesModel *placesModel = qobject_cast<KFilePlacesModel *>(model());
 
-    if (placesModel == 0) {
+    if (placesModel == nullptr) {
         return;
     }
 
@@ -560,7 +560,7 @@
     KFilePlacesModel *placesModel = qobject_cast<KFilePlacesModel *>(model());
     KFilePlacesViewDelegate *delegate = dynamic_cast<KFilePlacesViewDelegate *>(itemDelegate());
 
-    if (placesModel == 0) {
+    if (placesModel == nullptr) {
         return;
     }
 
@@ -569,13 +569,13 @@
 
     QMenu menu;
 
-    QAction *edit = 0;
-    QAction *hide = 0;
-    QAction *emptyTrash = 0;
-    QAction *eject = 0;
-    QAction *teardown = 0;
-    QAction *add = 0;
-    QAction *mainSeparator = 0;
+    QAction *edit = nullptr;
+    QAction *hide = nullptr;
+    QAction *emptyTrash = nullptr;
+    QAction *eject = nullptr;
+    QAction *teardown = nullptr;
+    QAction *add = nullptr;
+    QAction *mainSeparator = nullptr;
 
     if (index.isValid()) {
         if (!placesModel->isDevice(index)) {
@@ -590,22 +590,22 @@
             edit = menu.addAction(QIcon::fromTheme(QStringLiteral("document-properties")), i18n("&Edit Entry '%1'...", label));
         } else {
             eject = placesModel->ejectActionForIndex(index);
-            if (eject != 0) {
+            if (eject != nullptr) {
                 eject->setParent(&menu);
                 menu.addAction(eject);
             }
 
             teardown = placesModel->teardownActionForIndex(index);
-            if (teardown != 0) {
+            if (teardown != nullptr) {
                 teardown->setParent(&menu);
                 menu.addAction(teardown);
             }
 
-            if (teardown != 0 || eject != 0) {
+            if (teardown != nullptr || eject != nullptr) {
                 mainSeparator = menu.addSeparator();
             }
         }
-        if (add == 0) {
+        if (add == nullptr) {
             add = menu.addAction(QIcon::fromTheme(QStringLiteral("document-new")), i18n("Add Entry..."));
         }
 
@@ -616,18 +616,18 @@
         add = menu.addAction(QIcon::fromTheme(QStringLiteral("document-new")), i18n("Add Entry..."));
     }
 
-    QAction *showAll = 0;
+    QAction *showAll = nullptr;
     if (placesModel->hiddenCount() > 0) {
         showAll = new QAction(i18n("&Show All Entries"), &menu);
         showAll->setCheckable(true);
         showAll->setChecked(d->showAll);
-        if (mainSeparator == 0) {
+        if (mainSeparator == nullptr) {
             mainSeparator = menu.addSeparator();
         }
         menu.insertAction(mainSeparator, showAll);
     }
 
-    QAction *remove = 0;
+    QAction *remove = nullptr;
     if (index.isValid() && !placesModel->isDevice(index)) {
         remove = menu.addAction(QIcon::fromTheme(QStringLiteral("edit-delete")), i18n("&Remove Entry '%1'", label));
     }
@@ -640,7 +640,7 @@
 
     QAction *result = menu.exec(event->globalPos());
 
-    if (emptyTrash != 0 && result == emptyTrash) {
+    if (emptyTrash != nullptr && result == emptyTrash) {
 
         KIO::JobUiDelegate uiDelegate;
         uiDelegate.setWindow(window());
@@ -649,7 +649,7 @@
             KJobWidgets::setWindow(job, window());
             job->ui()->setAutoErrorHandlingEnabled(true);
         }
-    } else if (edit != 0 && result == edit) {
+    } else if (edit != nullptr && result == edit) {
         KBookmark bookmark = placesModel->bookmarkForIndex(index);
         QUrl url = bookmark.url();
         QString label = bookmark.text();
@@ -666,9 +666,9 @@
             placesModel->editPlace(index, label, url, iconName, appName);
         }
 
-    } else if (remove != 0 && result == remove) {
+    } else if (remove != nullptr && result == remove) {
         placesModel->removePlace(index);
-    } else if (hide != 0 && result == hide) {
+    } else if (hide != nullptr && result == hide) {
         placesModel->setPlaceHidden(index, hide->isChecked());
         QModelIndex current = placesModel->closestItem(d->currentUrl);
 
@@ -680,13 +680,13 @@
                 d->itemDisappearTimeline.start();
             }
         }
-    } else if (showAll != 0 && result == showAll) {
+    } else if (showAll != nullptr && result == showAll) {
         setShowAll(showAll->isChecked());
-    } else if (teardown != 0 && result == teardown) {
+    } else if (teardown != nullptr && result == teardown) {
         placesModel->requestTeardown(index);
-    } else if (eject != 0 && result == eject) {
+    } else if (eject != nullptr && result == eject) {
         placesModel->requestEject(index);
-    } else if (add != 0 && result == add) {
+    } else if (add != nullptr && result == add) {
         QUrl url = d->currentUrl;
         QString label;
         QString iconName = QStringLiteral("folder");
@@ -782,7 +782,7 @@
         const QRect rect = visualRect(index);
         if (!d->insertAbove(rect, pos) && !d->insertBelow(rect, pos)) {
             KFilePlacesModel *placesModel = qobject_cast<KFilePlacesModel *>(model());
-            Q_ASSERT(placesModel != 0);
+            Q_ASSERT(placesModel != nullptr);
             emit urlsDropped(placesModel->url(index), event, this);
             event->acceptProposedAction();
         }
@@ -899,7 +899,7 @@
 {
     KFilePlacesModel *placesModel = qobject_cast<KFilePlacesModel *>(q->model());
 
-    if (placesModel == 0) {
+    if (placesModel == nullptr) {
         return;
     }
 
@@ -933,7 +933,7 @@
 
     KFilePlacesModel *placesModel = qobject_cast<KFilePlacesModel *>(q->model());
 
-    if (placesModel == 0) {
+    if (placesModel == nullptr) {
         return;
     }
 
@@ -966,7 +966,7 @@
         }
     }
 
-    const int margin = q->style()->pixelMetric(QStyle::PM_FocusFrameHMargin, 0, q) + 1;
+    const int margin = q->style()->pixelMetric(QStyle::PM_FocusFrameHMargin, nullptr, q) + 1;
     const int maxWidth = q->viewport()->width() - textWidth - 4 * margin - 1;
     const int maxHeight = ((q->height() - (fm.height() / 2) * rowCount) / rowCount) - 1;
 
@@ -1001,7 +1001,7 @@
 {
     KFilePlacesModel *placesModel = qobject_cast<KFilePlacesModel *>(q->model());
 
-    if (placesModel == 0) {
+    if (placesModel == nullptr) {
         return;
     }
 
@@ -1074,7 +1074,7 @@
 {
     KFilePlacesModel *placesModel = qobject_cast<KFilePlacesModel *>(q->model());
 
-    if (placesModel == 0) {
+    if (placesModel == nullptr) {
         return;
     }
 
Index: src/filewidgets/kfileplacesview_p.h
===================================================================
--- src/filewidgets/kfileplacesview_p.h
+++ src/filewidgets/kfileplacesview_p.h
@@ -28,7 +28,7 @@
     Q_OBJECT
 
 public:
-    KFilePlacesEventWatcher(QObject *parent = 0)
+    KFilePlacesEventWatcher(QObject *parent = nullptr)
         : QObject(parent) {}
 
     const QModelIndex &hoveredIndex() const
Index: src/filewidgets/kfilepreviewgenerator.cpp
===================================================================
--- src/filewidgets/kfilepreviewgenerator.cpp
+++ src/filewidgets/kfilepreviewgenerator.cpp
@@ -82,7 +82,7 @@
         m_uniformSizes(false),
         m_view(qobject_cast<QListView *>(view))
     {
-        if (m_view != 0) {
+        if (m_view != nullptr) {
             m_uniformSizes = m_view->uniformItemSizes();
             m_view->setUniformItemSizes(true);
         }
@@ -90,7 +90,7 @@
 
     ~LayoutBlocker()
     {
-        if (m_view != 0) {
+        if (m_view != nullptr) {
             m_view->setUniformItemSizes(m_uniformSizes);
         }
     }
@@ -419,21 +419,21 @@
     m_internalDataChange(0),
     m_pendingVisibleIconUpdates(0),
     m_viewAdapter(viewAdapter),
-    m_itemView(0),
-    m_iconUpdateTimer(0),
-    m_scrollAreaTimer(0),
+    m_itemView(nullptr),
+    m_iconUpdateTimer(nullptr),
+    m_scrollAreaTimer(nullptr),
     m_previewJobs(),
-    m_proxyModel(0),
+    m_proxyModel(nullptr),
     m_cutItemsCache(),
     m_previews(),
     m_sequenceIndices(),
     m_changedItems(),
-    m_changedItemsTimer(0),
+    m_changedItemsTimer(nullptr),
     m_pendingItems(),
     m_dispatchedItems(),
     m_resolvedMimeTypes(),
     m_enabledPlugins(),
-    m_tileSet(0),
+    m_tileSet(nullptr),
     q(parent)
 {
     if (!m_viewAdapter->iconSize().isValid()) {
@@ -441,7 +441,7 @@
     }
 
     m_proxyModel = qobject_cast<QAbstractProxyModel *>(model);
-    m_dirModel = (m_proxyModel == 0) ?
+    m_dirModel = (m_proxyModel == nullptr) ?
                  qobject_cast<KDirModel *>(model) :
                  qobject_cast<KDirModel *>(m_proxyModel->sourceModel());
     if (!m_dirModel) {
@@ -606,8 +606,8 @@
 void KFilePreviewGenerator::Private::addToPreviewQueue(const KFileItem &item, const QPixmap &pixmap)
 {
     KIO::PreviewJob *senderJob = qobject_cast<KIO::PreviewJob *>(q->sender());
-    Q_ASSERT(senderJob != 0);
-    if (senderJob != 0) {
+    Q_ASSERT(senderJob != nullptr);
+    if (senderJob != nullptr) {
         QMap<QUrl, int>::iterator it = m_sequenceIndices.find(item.url());
         if (senderJob->sequenceIndex() && (it == m_sequenceIndices.end() || *it != senderJob->sequenceIndex())) {
             return; // the sequence index does not match the one we want
@@ -794,7 +794,7 @@
 {
     m_iconUpdatesPaused = true;
     foreach (KJob *job, m_previewJobs) {
-        Q_ASSERT(job != 0);
+        Q_ASSERT(job != nullptr);
         job->suspend();
     }
     m_scrollAreaTimer->start();
@@ -958,7 +958,7 @@
                      maxSize.height() - TileSet::TopMargin - TileSet::BottomMargin);
     limitToSize(icon, size);
 
-    if (m_tileSet == 0) {
+    if (m_tileSet == nullptr) {
         m_tileSet = new TileSet();
     }
 
@@ -1082,7 +1082,7 @@
 void KFilePreviewGenerator::Private::killPreviewJobs()
 {
     foreach (KJob *job, m_previewJobs) {
-        Q_ASSERT(job != 0);
+        Q_ASSERT(job != nullptr);
         job->kill();
     }
     m_previewJobs.clear();
@@ -1102,7 +1102,7 @@
 
     // Order the items in a way that the preview for the visible items
     // is generated first, as this improves the feeled performance a lot.
-    const bool hasProxy = (m_proxyModel != 0);
+    const bool hasProxy = (m_proxyModel != nullptr);
     const int itemCount = items.count();
     const QRect visibleArea = m_viewAdapter->visibleArea();
 
Index: src/filewidgets/kfilewidget.h
===================================================================
--- src/filewidgets/kfilewidget.h
+++ src/filewidgets/kfilewidget.h
@@ -86,7 +86,7 @@
       * @param parent The parent widget of this widget
       *
       */
-    explicit KFileWidget(const QUrl &startDir, QWidget *parent = 0);
+    explicit KFileWidget(const QUrl &startDir, QWidget *parent = nullptr);
 
     /**
      * Destructor
Index: src/filewidgets/kfilewidget.cpp
===================================================================
--- src/filewidgets/kfilewidget.cpp
+++ src/filewidgets/kfilewidget.cpp
@@ -81,20 +81,20 @@
 public:
     KFileWidgetPrivate(KFileWidget *widget)
         : q(widget),
-          boxLayout(0),
-          placesDock(0),
-          placesView(0),
-          placesViewSplitter(0),
+          boxLayout(nullptr),
+          placesDock(nullptr),
+          placesView(nullptr),
+          placesViewSplitter(nullptr),
           placesViewWidth(-1),
-          labeledCustomWidget(0),
-          bottomCustomWidget(0),
-          autoSelectExtCheckBox(0),
+          labeledCustomWidget(nullptr),
+          bottomCustomWidget(nullptr),
+          autoSelectExtCheckBox(nullptr),
           operationMode(KFileWidget::Opening),
-          bookmarkHandler(0),
-          toolbar(0),
-          locationEdit(0),
-          ops(0),
-          filterWidget(0),
+          bookmarkHandler(nullptr),
+          toolbar(nullptr),
+          locationEdit(nullptr),
+          ops(nullptr),
+          filterWidget(nullptr),
           autoSelectExtChecked(false),
           keepLocation(false),
           hasView(false),
@@ -103,7 +103,7 @@
           dummyAdded(false),
           confirmOverwrite(false),
           differentHierarchyLevelItemsEntered(false),
-          iconSizeSlider(0)
+          iconSizeSlider(nullptr)
     {
     }
 
@@ -867,7 +867,7 @@
             QList<QUrl> urlList;                            // one time is always enough.
             int start = 0;
             QUrl topMostUrl;
-            KIO::StatJob *statJob = 0;
+            KIO::StatJob *statJob = nullptr;
             bool res = false;
 
             // we need to check for a valid first url, so in theory we only iterate one time over
@@ -1955,7 +1955,7 @@
         tmpGroup.writeEntry(SpeedbarWidth, sizes[0]);
     }
 
-    tmpGroup.writeEntry(ShowBookmarks, bookmarkHandler != 0);
+    tmpGroup.writeEntry(ShowBookmarks, bookmarkHandler != nullptr);
     tmpGroup.writeEntry(AutoSelectExtChecked, autoSelectExtChecked);
     tmpGroup.writeEntry(BreadcrumbNavigation, !urlNavigator->isUrlEditable());
     tmpGroup.writeEntry(ShowFullPath, urlNavigator->showFullPath());
@@ -2605,9 +2605,9 @@
         toolbar->addAction(bookmarkButton);
     } else if (bookmarkHandler) {
         delete bookmarkHandler;
-        bookmarkHandler = 0;
+        bookmarkHandler = nullptr;
         delete bookmarkButton;
-        bookmarkButton = 0;
+        bookmarkButton = nullptr;
     }
 
     static_cast<KToggleAction *>(q->actionCollection()->action(QStringLiteral("toggleBookmarks")))->setChecked(show);
Index: src/filewidgets/kimagefilepreview.h
===================================================================
--- src/filewidgets/kimagefilepreview.h
+++ src/filewidgets/kimagefilepreview.h
@@ -36,7 +36,7 @@
      *
      * @param parent The parent widget.
      */
-    explicit KImageFilePreview(QWidget *parent = 0);
+    explicit KImageFilePreview(QWidget *parent = nullptr);
 
     /**
      * Destroys the image file preview.
Index: src/filewidgets/kimagefilepreview.cpp
===================================================================
--- src/filewidgets/kimagefilepreview.cpp
+++ src/filewidgets/kimagefilepreview.cpp
@@ -33,7 +33,7 @@
 {
 public:
     KImageFilePreviewPrivate()
-        : m_job(0)
+        : m_job(nullptr)
         , clear(true)
     {
         m_timeLine = new QTimeLine(150);
@@ -173,14 +173,14 @@
         previewJob->setScaleType(KIO::PreviewJob::Scaled);
         return previewJob;
     } else {
-        return 0;
+        return nullptr;
     }
 }
 
 void KImageFilePreview::gotPreview(const KFileItem &item, const QPixmap &pm)
 {
     if (item.url() == d->currentURL) {  // should always be the case
-        if (style()->styleHint(QStyle::SH_Widget_Animate, 0, this)) {
+        if (style()->styleHint(QStyle::SH_Widget_Animate, nullptr, this)) {
             if (d->m_timeLine->state() == QTimeLine::Running) {
                 d->m_timeLine->setCurrentTime(0);
             }
@@ -208,7 +208,7 @@
 void KImageFilePreview::KImageFilePreviewPrivate::_k_slotResult(KJob *job)
 {
     if (job == m_job) {
-        m_job = 0L;
+        m_job = nullptr;
     }
 }
 
@@ -256,14 +256,14 @@
 {
     if (d->m_job) {
         d->m_job->kill();
-        d->m_job = 0L;
+        d->m_job = nullptr;
     }
 
     if (d->clear || d->m_timeLine->state() == QTimeLine::Running) {
         return;
     }
 
-    if (style()->styleHint(QStyle::SH_Widget_Animate, 0, this)) {
+    if (style()->styleHint(QStyle::SH_Widget_Animate, nullptr, this)) {
         d->m_pmTransition = QPixmap();
         //If we add a previous preview then we run the animation
         if (!d->m_pmCurrent.isNull()) {
Index: src/filewidgets/knewfilemenu.cpp
===================================================================
--- src/filewidgets/knewfilemenu.cpp
+++ src/filewidgets/knewfilemenu.cpp
@@ -78,9 +78,9 @@
 {
 public:
     KNewFileMenuSingleton()
-        : dirWatch(0),
+        : dirWatch(nullptr),
           filesParsed(false),
-          templatesList(0),
+          templatesList(nullptr),
           templatesVersion(0)
     {
     }
@@ -391,7 +391,7 @@
 
         KMessageBox::createKMessageBox(dialog, buttonBox, QMessageBox::Warning,
                                        i18n("<qt>The template file <b>%1</b> does not exist.</qt>", src),
-                                       QStringList(), QString(), 0, KMessageBox::NoExec,
+                                       QStringList(), QString(), nullptr, KMessageBox::NoExec,
                                        QString());
 
         dialog->show();
@@ -427,7 +427,7 @@
                                    i18n("The name \"%1\" starts with a dot, so the directory will be hidden by default.", name),
                                    QStringList(),
                                    i18n("Do not ask again"),
-                                   0,
+                                   nullptr,
                                    KMessageBox::NoExec,
                                    QString());
 
@@ -635,13 +635,13 @@
     QMenu *menu = q->menu();
     menu->clear();
     m_menuDev->menu()->clear();
-    m_newDirAction = 0;
+    m_newDirAction = nullptr;
 
     QSet<QString> seenTexts;
     // these shall be put at special positions
-    QAction *linkURL = 0;
-    QAction *linkApp = 0;
-    QAction *linkPath = 0;
+    QAction *linkURL = nullptr;
+    QAction *linkApp = nullptr;
+    QAction *linkPath = nullptr;
 
     KNewFileMenuSingleton *s = kNewMenuGlobals();
     int i = 1;
@@ -1075,7 +1075,7 @@
     connect(d->m_newMenuGroup, SIGNAL(triggered(QAction*)), this, SLOT(_k_slotActionTriggered(QAction*)));
     d->m_actionCollection = collection;
     d->m_parentWidget = qobject_cast<QWidget *>(parent);
-    d->m_newDirAction = 0;
+    d->m_newDirAction = nullptr;
 
     if (d->m_actionCollection) {
         d->m_actionCollection->addAction(name, this);
@@ -1237,7 +1237,7 @@
             const QUrl localUrl = d->mostLocalUrl(destUrl);
             if (localUrl.isLocalFile()) {
                 // Normal (local) file. Need to "touch" it, kio_file copied the mtime.
-                (void) ::utime(QFile::encodeName(localUrl.toLocalFile()).constData(), 0);
+                (void) ::utime(QFile::encodeName(localUrl.toLocalFile()).constData(), nullptr);
             }
             emit fileCreated(destUrl);
         } else if (KIO::SimpleJob *simpleJob = ::qobject_cast<KIO::SimpleJob *>(job)) {
Index: src/filewidgets/kurlnavigator.h
===================================================================
--- src/filewidgets/kurlnavigator.h
+++ src/filewidgets/kurlnavigator.h
@@ -78,7 +78,7 @@
 
 public:
     /** @since 4.5 */
-    KUrlNavigator(QWidget *parent = 0);
+    KUrlNavigator(QWidget *parent = nullptr);
 
     /**
      * @param placesModel    Model for the places which are selectable inside a
Index: src/filewidgets/kurlnavigator.cpp
===================================================================
--- src/filewidgets/kurlnavigator.cpp
+++ src/filewidgets/kurlnavigator.cpp
@@ -195,16 +195,16 @@
 KUrlNavigator::Private::Private(KUrlNavigator *q, KFilePlacesModel *placesModel) :
     m_editable(false),
     m_active(true),
-    m_showPlacesSelector(placesModel != 0),
+    m_showPlacesSelector(placesModel != nullptr),
     m_showFullPath(false),
     m_historyIndex(0),
     m_layout(new QHBoxLayout),
-    m_placesSelector(0),
-    m_pathBox(0),
-    m_protocols(0),
-    m_dropDownButton(0),
+    m_placesSelector(nullptr),
+    m_pathBox(nullptr),
+    m_protocols(nullptr),
+    m_dropDownButton(nullptr),
     m_navButtons(),
-    m_toggleEditableMode(0),
+    m_toggleEditableMode(nullptr),
     m_homeUrl(),
     m_customProtocols(QStringList()),
     q(q)
@@ -215,7 +215,7 @@
     // initialize the places selector
     q->setAutoFillBackground(false);
 
-    if (placesModel != 0) {
+    if (placesModel != nullptr) {
         m_placesSelector = new KUrlNavigatorPlacesSelector(q, placesModel);
         connect(m_placesSelector, SIGNAL(placeActivated(QUrl)),
                 q, SLOT(setLocationUrl(QUrl)));
@@ -264,7 +264,7 @@
     connect(m_toggleEditableMode, SIGNAL(clicked()),
             q, SLOT(slotToggleEditableButtonPressed()));
 
-    if (m_placesSelector != 0) {
+    if (m_placesSelector != nullptr) {
         m_layout->addWidget(m_placesSelector);
     }
     m_layout->addWidget(m_protocols);
@@ -389,7 +389,7 @@
 
     const QPoint pos = q->mapToGlobal(m_dropDownButton->geometry().bottomRight());
     const QAction *activatedAction = popup->exec(pos);
-    if (activatedAction != 0) {
+    if (activatedAction != nullptr) {
         const QUrl url(activatedAction->data().toString());
         q->setLocationUrl(url);
     }
@@ -515,7 +515,7 @@
 void KUrlNavigator::Private::updateContent()
 {
     const QUrl currentUrl = q->locationUrl();
-    if (m_placesSelector != 0) {
+    if (m_placesSelector != nullptr) {
         m_placesSelector->updateSelection(currentUrl);
     }
 
@@ -540,7 +540,7 @@
         // Calculate the start index for the directories that should be shown as buttons
         // and create the buttons
         QUrl placeUrl;
-        if ((m_placesSelector != 0) && !m_showFullPath) {
+        if ((m_placesSelector != nullptr) && !m_showFullPath) {
             placeUrl = m_placesSelector->selectedPlaceUrl();
         }
 
@@ -575,7 +575,7 @@
         const QString dirName = path.section(QLatin1Char('/'), idx, idx);
         hasNext = isFirstButton || !dirName.isEmpty();
         if (hasNext) {
-            KUrlNavigatorButton *button = 0;
+            KUrlNavigatorButton *button = nullptr;
             if (createButton) {
                 button = new KUrlNavigatorButton(buttonUrl(idx), q);
                 button->installEventFilter(q);
@@ -644,11 +644,11 @@
     // Subtract all widgets from the available width, that must be shown anyway
     int availableWidth = q->width() - m_toggleEditableMode->minimumWidth();
 
-    if ((m_placesSelector != 0) && m_placesSelector->isVisible()) {
+    if ((m_placesSelector != nullptr) && m_placesSelector->isVisible()) {
         availableWidth -= m_placesSelector->width();
     }
 
-    if ((m_protocols != 0) && m_protocols->isVisible()) {
+    if ((m_protocols != nullptr) && m_protocols->isVisible()) {
         availableWidth -= m_protocols->width();
     }
 
@@ -712,7 +712,7 @@
 
     // The first URL navigator button should get the name of the
     // place instead of the directory name
-    if ((m_placesSelector != 0) && !m_showFullPath) {
+    if ((m_placesSelector != nullptr) && !m_showFullPath) {
         text = m_placesSelector->selectedPlaceText();
     }
 
@@ -824,7 +824,7 @@
 
 KUrlNavigator::KUrlNavigator(QWidget *parent) :
     QWidget(parent),
-    d(new Private(this, 0))
+    d(new Private(this, nullptr))
 {
     d->initialize(QUrl());
 }
@@ -979,7 +979,7 @@
         return;
     }
 
-    if (visible  && (d->m_placesSelector == 0)) {
+    if (visible  && (d->m_placesSelector == nullptr)) {
         // the places selector cannot get visible as no
         // places model is available
         return;
Index: src/filewidgets/kurlnavigatorbutton.cpp
===================================================================
--- src/filewidgets/kurlnavigatorbutton.cpp
+++ src/filewidgets/kurlnavigatorbutton.cpp
@@ -49,8 +49,8 @@
     m_wheelSteps(0),
     m_url(url),
     m_subDir(),
-    m_openSubDirsTimer(0),
-    m_subDirsJob(0)
+    m_openSubDirsTimer(nullptr),
+    m_subDirsJob(nullptr)
 {
     setAcceptDrops(true);
     setUrl(url);
@@ -317,12 +317,12 @@
         m_hoverArrow = true;
         update();
 
-        if (m_subDirsMenu == 0) {
+        if (m_subDirsMenu == nullptr) {
             requestSubDirs();
         } else if (m_subDirsMenu->parent() != this) {
             m_subDirsMenu->close();
             m_subDirsMenu->deleteLater();
-            m_subDirsMenu = 0;
+            m_subDirsMenu = nullptr;
 
             requestSubDirs();
         }
@@ -331,7 +331,7 @@
             cancelSubDirsRequest();
         }
         delete m_subDirsMenu;
-        m_subDirsMenu = 0;
+        m_subDirsMenu = nullptr;
         m_hoverArrow = false;
         update();
     }
@@ -390,14 +390,14 @@
 
 void KUrlNavigatorButton::requestSubDirs()
 {
-    if (!m_openSubDirsTimer->isActive() && (m_subDirsJob == 0)) {
+    if (!m_openSubDirsTimer->isActive() && (m_subDirsJob == nullptr)) {
         m_openSubDirsTimer->start();
     }
 }
 
 void KUrlNavigatorButton::startSubDirsJob()
 {
-    if (m_subDirsJob != 0) {
+    if (m_subDirsJob != nullptr) {
         return;
     }
 
@@ -490,7 +490,7 @@
 void KUrlNavigatorButton::openSubDirsMenu(KJob *job)
 {
     Q_ASSERT(job == m_subDirsJob);
-    m_subDirsJob = 0;
+    m_subDirsJob = nullptr;
 
     if (job->error() || m_subDirs.isEmpty()) {
         // clear listing
@@ -502,10 +502,10 @@
     setDisplayHintEnabled(PopupActiveHint, true);
     update(); // ensure the button is drawn highlighted
 
-    if (m_subDirsMenu != 0) {
+    if (m_subDirsMenu != nullptr) {
         m_subDirsMenu->close();
         m_subDirsMenu->deleteLater();
-        m_subDirsMenu = 0;
+        m_subDirsMenu = nullptr;
     }
 
     m_subDirsMenu = new KUrlNavigatorMenu(this);
@@ -527,7 +527,7 @@
 
     m_subDirs.clear();
     delete m_subDirsMenu;
-    m_subDirsMenu = 0;
+    m_subDirsMenu = nullptr;
 
     setDisplayHintEnabled(PopupActiveHint, false);
 }
@@ -535,7 +535,7 @@
 void KUrlNavigatorButton::replaceButton(KJob *job)
 {
     Q_ASSERT(job == m_subDirsJob);
-    m_subDirsJob = 0;
+    m_subDirsJob = nullptr;
     m_replaceButton = false;
 
     if (job->error() || m_subDirs.isEmpty()) {
@@ -575,9 +575,9 @@
 void KUrlNavigatorButton::cancelSubDirsRequest()
 {
     m_openSubDirsTimer->stop();
-    if (m_subDirsJob != 0) {
+    if (m_subDirsJob != nullptr) {
         m_subDirsJob->kill();
-        m_subDirsJob = 0;
+        m_subDirsJob = nullptr;
     }
 }
 
Index: src/filewidgets/kurlnavigatormenu.cpp
===================================================================
--- src/filewidgets/kurlnavigatormenu.cpp
+++ src/filewidgets/kurlnavigatormenu.cpp
@@ -53,7 +53,7 @@
 void KUrlNavigatorMenu::dropEvent(QDropEvent *event)
 {
     QAction *action = actionAt(event->pos());
-    if (action != 0) {
+    if (action != nullptr) {
         emit urlsDropped(action, event);
     }
 }
@@ -61,7 +61,7 @@
 void KUrlNavigatorMenu::mouseReleaseEvent(QMouseEvent *event)
 {
     QAction *action = actionAt(event->pos());
-    if (action != 0) {
+    if (action != nullptr) {
         Qt::MouseButton btn = event->button();
         emit mouseButtonClicked(action, btn);
     }
Index: src/filewidgets/kurlnavigatorplacesselector.cpp
===================================================================
--- src/filewidgets/kurlnavigatorplacesselector.cpp
+++ src/filewidgets/kurlnavigatorplacesselector.cpp
@@ -103,7 +103,7 @@
 
     const QModelIndex index = m_placesModel->index(m_selectedItem, 0);
     QAction *teardown = m_placesModel->teardownActionForIndex(index);
-    if (teardown != 0) {
+    if (teardown != nullptr) {
         teardown->setParent(m_placesMenu);
         teardown->setData("teardownAction");
 
@@ -192,7 +192,7 @@
 
 void KUrlNavigatorPlacesSelector::activatePlace(QAction *action)
 {
-    Q_ASSERT(action != 0);
+    Q_ASSERT(action != nullptr);
     if (action->data().toString() == QLatin1String("teardownAction")) {
         QModelIndex index = m_placesModel->index(m_selectedItem, 0);
         m_placesModel->requestTeardown(index);
Index: src/filewidgets/kurlnavigatorprotocolcombo.cpp
===================================================================
--- src/filewidgets/kurlnavigatorprotocolcombo.cpp
+++ src/filewidgets/kurlnavigatorprotocolcombo.cpp
@@ -41,7 +41,7 @@
 
 KUrlNavigatorProtocolCombo::KUrlNavigatorProtocolCombo(const QString &protocol, QWidget *parent) :
     KUrlNavigatorButtonBase(parent),
-    m_menu(0),
+    m_menu(nullptr),
     m_protocols(),
     m_categories()
 {
Index: src/filewidgets/kurlnavigatorprotocolcombo_p.h
===================================================================
--- src/filewidgets/kurlnavigatorprotocolcombo_p.h
+++ src/filewidgets/kurlnavigatorprotocolcombo_p.h
@@ -43,7 +43,7 @@
     Q_OBJECT
 
 public:
-    explicit KUrlNavigatorProtocolCombo(const QString &protocol, QWidget *parent = 0);
+    explicit KUrlNavigatorProtocolCombo(const QString &protocol, QWidget *parent = nullptr);
 
     QString currentProtocol() const;
 
Index: src/ioslaves/file/file.cpp
===================================================================
--- src/ioslaves/file/file.cpp
+++ src/ioslaves/file/file.cpp
@@ -154,7 +154,7 @@
 }
 
 FileProtocol::FileProtocol(const QByteArray &pool, const QByteArray &app)
-    : SlaveBase(QByteArrayLiteral("file"), pool, app), mFile(0)
+    : SlaveBase(QByteArrayLiteral("file"), pool, app), mFile(nullptr)
 {
 }
 
@@ -182,7 +182,7 @@
     const QString defaultACLString = metaData(QStringLiteral("DEFAULT_ACL_STRING"));
     // Empty strings mean leave as is
     if (!ACLString.isEmpty()) {
-        acl_t acl = 0;
+        acl_t acl = nullptr;
         if (ACLString == QLatin1String("ACL_DELETE")) {
             // user told us to delete the extended ACL, so let's write only
             // the minimal (UNIX permission bits) part
@@ -526,7 +526,7 @@
     Q_ASSERT(mFile);
 
     delete mFile;
-    mFile = 0;
+    mFile = nullptr;
 
     finished();
 }
@@ -1248,7 +1248,7 @@
 
 bool FileProtocol::isExtendedACL(acl_t acl)
 {
-    return (acl_equiv_mode(acl, 0) != 0);
+    return (acl_equiv_mode(acl, nullptr) != 0);
 }
 
 static void appendACLAtoms(const QByteArray &path, UDSEntry &entry, mode_t type)
@@ -1258,8 +1258,8 @@
         return;
     }
 
-    acl_t acl = 0;
-    acl_t defaultAcl = 0;
+    acl_t acl = nullptr;
+    acl_t defaultAcl = nullptr;
     bool isDir = (type & QT_STAT_MASK) == QT_STAT_DIR;
     // do we have an acl for the file, and/or a default acl for the dir, if it is one?
     acl = acl_get_file(path.data(), ACL_TYPE_ACCESS);
@@ -1269,7 +1269,7 @@
         if (acl) {
             if (!FileProtocol::isExtendedACL(acl)) {
                 acl_free(acl);
-                acl = 0;
+                acl = nullptr;
             }
         }
         defaultAcl = acl_get_file(path.data(), ACL_TYPE_DEFAULT);
Index: src/ioslaves/file/file_unix.cpp
===================================================================
--- src/ioslaves/file/file_unix.cpp
+++ src/ioslaves/file/file_unix.cpp
@@ -153,7 +153,7 @@
     if (acl && !isExtendedACL(acl)) {
         // qDebug() << _dest.data() << " doesn't have extended ACL";
         acl_free(acl);
-        acl = NULL;
+        acl = nullptr;
     }
 #endif
     totalSize(buff_src.st_size);
@@ -312,7 +312,7 @@
     const QString path(url.toLocalFile());
     const QByteArray _path(QFile::encodeName(path));
     DIR *dp = opendir(_path.data());
-    if (dp == 0) {
+    if (dp == nullptr) {
         switch (errno) {
         case ENOENT:
             error(KIO::ERR_DOES_NOT_EXIST, path);
@@ -356,7 +356,7 @@
     QT_STATBUF st;
 #endif
     QT_DIRENT *ep;
-    while ((ep = QT_READDIR(dp)) != 0) {
+    while ((ep = QT_READDIR(dp)) != nullptr) {
         entry.clear();
 
         const QString filename = QFile::decodeName(ep->d_name);
Index: src/ioslaves/ftp/ftp.h
===================================================================
--- src/ioslaves/ftp/ftp.h
+++ src/ioslaves/ftp/ftp.h
@@ -141,7 +141,7 @@
      *                    was changed during login.
      * @return true on success.
      */
-    bool ftpLogin(bool *userChanged = 0);
+    bool ftpLogin(bool *userChanged = nullptr);
 
     /**
      * ftpSendCmd - send a command (@p cmd) and read response
Index: src/ioslaves/ftp/ftp.cpp
===================================================================
--- src/ioslaves/ftp/ftp.cpp
+++ src/ioslaves/ftp/ftp.cpp
@@ -207,7 +207,7 @@
 
     // init other members
     m_port = 0;
-    m_socketProxyAuth = 0;
+    m_socketProxyAuth = nullptr;
 }
 
 Ftp::~Ftp()
@@ -257,7 +257,7 @@
         m_iRespCode = 0;
 
         if (!pTxt) {
-            return 0;    // avoid using a NULL when calling atoi.
+            return nullptr;    // avoid using a NULL when calling atoi.
         }
 
         // If the server sends a multiline response starting with
@@ -1634,19 +1634,19 @@
 
         // we should always get the following 5 fields ...
         const char *p_access, *p_junk, *p_owner, *p_group, *p_size;
-        if ((p_access = strtok((char *)buffer, " ")) == 0) {
+        if ((p_access = strtok((char *)buffer, " ")) == nullptr) {
             continue;
         }
-        if ((p_junk  = strtok(NULL, " ")) == 0) {
+        if ((p_junk  = strtok(nullptr, " ")) == nullptr) {
             continue;
         }
-        if ((p_owner = strtok(NULL, " ")) == 0) {
+        if ((p_owner = strtok(nullptr, " ")) == nullptr) {
             continue;
         }
-        if ((p_group = strtok(NULL, " ")) == 0) {
+        if ((p_group = strtok(nullptr, " ")) == nullptr) {
             continue;
         }
-        if ((p_size  = strtok(NULL, " ")) == 0) {
+        if ((p_size  = strtok(nullptr, " ")) == nullptr) {
             continue;
         }
 
@@ -1662,9 +1662,9 @@
         // A special hack for "/dev". A listing may look like this:
         // crw-rw-rw-   1 root     root       1,   5 Jun 29  1997 zero
         // So we just ignore the number in front of the ",". Ok, it is a hack :-)
-        if (strchr(p_size, ',') != 0L) {
+        if (strchr(p_size, ',') != nullptr) {
             qCDebug(KIO_FTP) << "Size contains a ',' -> reading size again (/dev hack)";
-            if ((p_size = strtok(NULL, " ")) == 0) {
+            if ((p_size = strtok(nullptr, " ")) == nullptr) {
                 continue;
             }
         }
@@ -1676,17 +1676,17 @@
         if (!isdigit(*p_size)) {
             p_date_1 = p_size;
             p_size = p_group;
-            p_group = 0;
+            p_group = nullptr;
             qCDebug(KIO_FTP) << "Size didn't have a digit -> size=" << p_size << " date_1=" << p_date_1;
         } else {
-            p_date_1 = strtok(NULL, " ");
+            p_date_1 = strtok(nullptr, " ");
             qCDebug(KIO_FTP) << "Size has a digit -> ok. p_date_1=" << p_date_1;
         }
 
-        if (p_date_1 != 0 &&
-                (p_date_2 = strtok(NULL, " ")) != 0 &&
-                (p_date_3 = strtok(NULL, " ")) != 0 &&
-                (p_name = strtok(NULL, "\r\n")) != 0) {
+        if (p_date_1 != nullptr &&
+                (p_date_2 = strtok(nullptr, " ")) != nullptr &&
+                (p_date_3 = strtok(nullptr, " ")) != nullptr &&
+                (p_name = strtok(nullptr, "\r\n")) != nullptr) {
             {
                 QByteArray tmp(p_name);
                 if (p_access[0] == 'l') {
@@ -2279,7 +2279,7 @@
 
     // skip leading "213 " (response code)
     const char *psz = ftpResponse(4);
-    return psz != 0;
+    return psz != nullptr;
 }
 
 // Today the differences between ASCII and BINARY are limited to
@@ -2638,7 +2638,7 @@
         cacheAuthentication(a);
     }
     delete m_socketProxyAuth;
-    m_socketProxyAuth = 0;
+    m_socketProxyAuth = nullptr;
 }
 
 void Ftp::fixupEntryName(FtpEntry *e)
Index: src/ioslaves/help/kio_help.cpp
===================================================================
--- src/ioslaves/help/kio_help.cpp
+++ src/ioslaves/help/kio_help.cpp
@@ -145,7 +145,7 @@
 
 }
 
-HelpProtocol *slave = 0;
+HelpProtocol *slave = nullptr;
 
 HelpProtocol::HelpProtocol(bool ghelp, const QByteArray &pool, const QByteArray &app)
     : SlaveBase(ghelp ? "ghelp" : "help", pool, app), mGhelp(ghelp)
Index: src/ioslaves/http/http.h
===================================================================
--- src/ioslaves/http/http.h
+++ src/ioslaves/http/http.h
@@ -85,7 +85,7 @@
             useCache = false;
             ioMode = NoCache;
             bytesCached = 0;
-            file = 0;
+            file = nullptr;
         }
 
         enum CachePlan {
Index: src/ioslaves/http/http.cpp
===================================================================
--- src/ioslaves/http/http.cpp
+++ src/ioslaves/http/http.cpp
@@ -278,7 +278,7 @@
     }
 
     if (!device->open(QIODevice::ReadWrite)) {
-        return 0;
+        return nullptr;
     }
 
     return device;
@@ -371,16 +371,16 @@
     , m_iSize(NO_SIZE)
     , m_iPostDataSize(NO_SIZE)
     , m_isBusy(false)
-    , m_POSTbuf(0)
+    , m_POSTbuf(nullptr)
     , m_maxCacheAge(DEFAULT_MAX_CACHE_AGE)
     , m_maxCacheSize(DEFAULT_MAX_CACHE_SIZE)
     , m_protocol(protocol)
-    , m_wwwAuth(0)
+    , m_wwwAuth(nullptr)
     , m_triedWwwCredentials(NoCredentials)
-    , m_proxyAuth(0)
+    , m_proxyAuth(nullptr)
     , m_triedProxyCredentials(NoCredentials)
-    , m_socketProxyAuth(0)
-    , m_networkConfig(0)
+    , m_socketProxyAuth(nullptr)
+    , m_networkConfig(nullptr)
     , m_kioError(0)
     , m_isLoadingErrorPage(false)
     , m_remoteRespTimeout(DEFAULT_RESPONSE_TIMEOUT)
@@ -403,8 +403,8 @@
 
     delete m_proxyAuth;
     delete m_wwwAuth;
-    m_proxyAuth = 0;
-    m_wwwAuth = 0;
+    m_proxyAuth = nullptr;
+    m_wwwAuth = nullptr;
     m_request.proxyUrl.clear(); //TODO revisit
     m_request.proxyUrls.clear();
 
@@ -535,9 +535,9 @@
     m_request.prevResponseCode = 0;
 
     delete m_wwwAuth;
-    m_wwwAuth = 0;
+    m_wwwAuth = nullptr;
     delete m_socketProxyAuth;
-    m_socketProxyAuth = 0;
+    m_socketProxyAuth = nullptr;
     m_blacklistedWwwAuthMethods.clear();
     m_triedWwwCredentials = NoCredentials;
     m_blacklistedProxyAuthMethods.clear();
@@ -1308,7 +1308,7 @@
 
             // force re-authentication...
             delete m_wwwAuth;
-            m_wwwAuth = 0;
+            m_wwwAuth = nullptr;
         }
     }
 
@@ -1388,7 +1388,7 @@
         m_request.cacheTag.policy = CC_Reload;
         // force re-authentication...
         delete m_wwwAuth;
-        m_wwwAuth = 0;
+        m_wwwAuth = nullptr;
         proceedUntilResponseHeader();
     }
 
@@ -3178,7 +3178,7 @@
         // get the size of our data
         tIt = tokenizer.iterator("content-length");
         if (tIt.hasNext()) {
-            m_iSize = STRTOLL(tIt.next().constData(), 0, 10);
+            m_iSize = STRTOLL(tIt.next().constData(), nullptr, 10);
         }
 
         tIt = tokenizer.iterator("content-location");
@@ -4131,7 +4131,7 @@
         }
         Q_ASSERT(bufPos > 2);
 
-        long long nextChunkSize = STRTOLL(m_receiveBuf.data(), 0, 16);
+        long long nextChunkSize = STRTOLL(m_receiveBuf.data(), nullptr, 16);
         if (nextChunkSize < 0) {
             qCDebug(KIO_HTTP) << "Negative chunk size";
             return -1;
@@ -4416,7 +4416,7 @@
     // any transfer-encoding applied to the message-body. If the message is
     // received with a transfer-encoding, that encoding MUST be removed
     // prior to checking the Content-MD5 value against the received entity.
-    HTTPFilterMD5 *md5Filter = 0;
+    HTTPFilterMD5 *md5Filter = nullptr;
     if (useMD5) {
         md5Filter = new HTTPFilterMD5;
         chain.addFilter(md5Filter);
@@ -4879,7 +4879,7 @@
         qCDebug(KIO_HTTP) << "deleting expired cache entry and recreating.";
         file->remove();
         delete file;
-        file = 0;
+        file = nullptr;
     }
 
     // note that QTemporaryFile will automatically append random chars to filename
@@ -4954,7 +4954,7 @@
             // on windows open files can't be renamed
             tempFile->setAutoRemove(false);
             delete tempFile;
-            file = 0;
+            file = nullptr;
 
             if (!QFile::rename(oldName, newName)) {
                 // ### currently this hides a minor bug when force-reloading a resource. We
@@ -4972,7 +4972,7 @@
         ccCommand = makeCacheCleanerCommand(m_request.cacheTag, UpdateFileCommand);
     }
     delete file;
-    file = 0;
+    file = nullptr;
 
     if (!ccCommand.isEmpty()) {
         sendCacheCleanerCommand(ccCommand);
@@ -5092,7 +5092,7 @@
     }
 
     delete m_POSTbuf;
-    m_POSTbuf = 0;
+    m_POSTbuf = nullptr;
 }
 
 bool HTTPProtocol::retrieveAllData()
@@ -5233,7 +5233,7 @@
     info.verifyPath = info.realmValue.isEmpty();
 
     const bool haveCachedCredentials = checkCachedAuthentication(info);
-    const bool retryAuth = (m_socketProxyAuth != 0);
+    const bool retryAuth = (m_socketProxyAuth != nullptr);
 
     // if m_socketProxyAuth is a valid pointer then authentication has been attempted before,
     // and it was not successful. see below and saveProxyAuthenticationForSocket().
@@ -5257,7 +5257,7 @@
             qCDebug(KIO_HTTP) << "proxy auth cancelled by user, or communication error";
             error(errorCode, QString());
             delete m_proxyAuth;
-            m_proxyAuth = 0;
+            m_proxyAuth = nullptr;
             return;
         }
     }
@@ -5294,14 +5294,14 @@
         cacheAuthentication(a);
     }
     delete m_socketProxyAuth;
-    m_socketProxyAuth = 0;
+    m_socketProxyAuth = nullptr;
 }
 
 void HTTPProtocol::saveAuthenticationData()
 {
     KIO::AuthInfo authinfo;
     bool alreadyCached = false;
-    KAbstractHttpAuthentication *auth = 0;
+    KAbstractHttpAuthentication *auth = nullptr;
     switch (m_request.prevResponseCode) {
     case 401:
         auth = m_wwwAuth;
@@ -5406,7 +5406,7 @@
                     blacklistedAuthTokens->append(scheme);
                 }
                 delete *auth;
-                *auth = 0;
+                *auth = nullptr;
             } else {     // Create authentication header
                 //  WORKAROUND: The following piece of code prevents brain dead IIS
                 // servers that send back multiple "WWW-Authenticate" headers from
@@ -5445,7 +5445,7 @@
             if (qstrnicmp(authScheme.constData(), bestOffer.constData(), authScheme.length()) != 0) {
                 // huh, the strongest authentication scheme offered has changed.
                 delete *auth;
-                *auth = 0;
+                *auth = nullptr;
             }
         }
 
@@ -5497,7 +5497,7 @@
                             }
                             qCDebug(KIO_HTTP) << "looks like the user canceled the authentication dialog";
                             delete *auth;
-                            *auth = 0;
+                            *auth = nullptr;
                         }
                         *triedCredentials = UserInputCredentials;
                     } else {
@@ -5614,7 +5614,7 @@
 
     // force re-authentication...
     delete m_wwwAuth;
-    m_wwwAuth = 0;
+    m_wwwAuth = nullptr;
 
     return true;
 }
Index: src/ioslaves/http/http_cache_cleaner.cpp
===================================================================
--- src/ioslaves/http/http_cache_cleaner.cpp
+++ src/ioslaves/http/http_cache_cleaner.cpp
@@ -617,7 +617,7 @@
 
     // Delete some of the files that need to be deleted. Return true when done, false otherwise.
     // This makes interleaved cleaning / serving ioslaves possible.
-    bool processSlice(Scoreboard *scoreboard = 0)
+    bool processSlice(Scoreboard *scoreboard = nullptr)
     {
         QTime t;
         t.start();
@@ -790,7 +790,7 @@
     qint64 newBytesCounter = LLONG_MAX;  // force cleaner run on startup
 
     Scoreboard scoreboard;
-    CacheCleaner *cleaner = 0;
+    CacheCleaner *cleaner = nullptr;
     while (true) {
         g_currentDate = QDateTime::currentDateTime();
         if (cleaner) {
@@ -838,7 +838,7 @@
             if (cleaner->processSlice(&scoreboard)) {
                 // that was the last slice, done
                 delete cleaner;
-                cleaner = 0;
+                cleaner = nullptr;
             }
         } else if (newBytesCounter > (g_maxCacheSize / 8)) {
             cacheDir.refresh();
Index: src/ioslaves/http/httpauthentication.h
===================================================================
--- src/ioslaves/http/httpauthentication.h
+++ src/ioslaves/http/httpauthentication.h
@@ -40,7 +40,7 @@
 class KAbstractHttpAuthentication
 {
 public:
-    KAbstractHttpAuthentication(KConfigGroup *config = 0);
+    KAbstractHttpAuthentication(KConfigGroup *config = nullptr);
     virtual ~KAbstractHttpAuthentication();
 
     /**
@@ -57,7 +57,7 @@
      * @param offer   the header from which an authentication object is created.
      * @param config  the config object to read stored authentication information.
      */
-    static KAbstractHttpAuthentication *newAuth(const QByteArray &offer, KConfigGroup *config = 0);
+    static KAbstractHttpAuthentication *newAuth(const QByteArray &offer, KConfigGroup *config = nullptr);
 
     /**
      * Split all headers containing multiple authentication offers.
@@ -225,7 +225,7 @@
     }
 private:
     friend class KAbstractHttpAuthentication;
-    KHttpBasicAuthentication(KConfigGroup *config = 0)
+    KHttpBasicAuthentication(KConfigGroup *config = nullptr)
         : KAbstractHttpAuthentication(config) {}
 };
 
@@ -251,7 +251,7 @@
     }
 private:
     friend class KAbstractHttpAuthentication;
-    KHttpDigestAuthentication(KConfigGroup *config = 0)
+    KHttpDigestAuthentication(KConfigGroup *config = nullptr)
         : KAbstractHttpAuthentication(config) {}
 #ifdef ENABLE_HTTP_AUTH_NONCE_SETTER
     QByteArray m_nonce;
@@ -267,7 +267,7 @@
     void generateResponse(const QString &user, const QString &password) Q_DECL_OVERRIDE;
 private:
     friend class KAbstractHttpAuthentication;
-    KHttpNtlmAuthentication(KConfigGroup *config = 0)
+    KHttpNtlmAuthentication(KConfigGroup *config = nullptr)
         : KAbstractHttpAuthentication(config), m_stage1State(Init) {}
     enum Stage1State {
         Init = 0,
@@ -287,7 +287,7 @@
     void generateResponse(const QString &user, const QString &password) Q_DECL_OVERRIDE;
 private:
     friend class KAbstractHttpAuthentication;
-    KHttpNegotiateAuthentication(KConfigGroup *config = 0)
+    KHttpNegotiateAuthentication(KConfigGroup *config = nullptr)
         : KAbstractHttpAuthentication(config) {}
 };
 #endif // HAVE_LIBGSSAPI
Index: src/ioslaves/http/httpauthentication.cpp
===================================================================
--- src/ioslaves/http/httpauthentication.cpp
+++ src/ioslaves/http/httpauthentication.cpp
@@ -75,7 +75,7 @@
 // keys on even indexes, values on odd indexes. Reduces code expansion for the templated
 // alternatives.
 // If "ba" starts with empty content it will be removed from ba to simplify later calls
-static QList<QByteArray> parseChallenge(QByteArray &ba, QByteArray *scheme, QByteArray *nextAuth = 0)
+static QList<QByteArray> parseChallenge(QByteArray &ba, QByteArray *scheme, QByteArray *nextAuth = nullptr)
 {
     QList<QByteArray> values;
     const char *b = ba.constData();
@@ -275,7 +275,7 @@
         } else if (scheme == "basic") { // krazy:exclude=strings
             return new KHttpBasicAuthentication();
         }
-    return 0;
+    return nullptr;
 }
 
 QList< QByteArray > KAbstractHttpAuthentication::splitOffers(const QList< QByteArray > &offers)
@@ -876,7 +876,7 @@
     major_status = gss_import_name(&minor_status, &input_token,
                                    GSS_C_NT_HOSTBASED_SERVICE, &server);
 
-    input_token.value = NULL;
+    input_token.value = nullptr;
     input_token.length = 0;
 
     if (GSS_ERROR(major_status)) {
@@ -897,8 +897,8 @@
                                         &ctx, server, mech_oid,
                                         req_flags, GSS_C_INDEFINITE,
                                         GSS_C_NO_CHANNEL_BINDINGS,
-                                        GSS_C_NO_BUFFER, NULL, &output_token,
-                                        NULL, NULL);
+                                        GSS_C_NO_BUFFER, nullptr, &output_token,
+                                        nullptr, nullptr);
 
     if (GSS_ERROR(major_status) || (output_token.length == 0)) {
         qCDebug(KIO_HTTP_AUTH) << "gss_init_sec_context failed:" << gssError(major_status, minor_status);
Index: src/ioslaves/http/httpfilter.cpp
===================================================================
--- src/ioslaves/http/httpfilter.cpp
+++ src/ioslaves/http/httpfilter.cpp
@@ -41,7 +41,7 @@
 */
 
 HTTPFilterBase::HTTPFilterBase()
-    : last(0)
+    : last(nullptr)
 {
 }
 
@@ -59,7 +59,7 @@
 }
 
 HTTPFilterChain::HTTPFilterChain()
-    : first(0)
+    : first(nullptr)
 {
 }
 
@@ -69,7 +69,7 @@
     if (!last) {
         first = filter;
     } else {
-        disconnect(last, SIGNAL(output(QByteArray)), 0, 0);
+        disconnect(last, SIGNAL(output(QByteArray)), nullptr, nullptr);
         filter->chain(last);
     }
     last = filter;
Index: src/ioslaves/http/kcookiejar/kcookiejar.h
===================================================================
--- src/ioslaves/http/kcookiejar/kcookiejar.h
+++ src/ioslaves/http/kcookiejar/kcookiejar.h
@@ -242,7 +242,7 @@
      * approved yet by the user but that will be included in the result
      * none the less.
      */
-    QString findCookies(const QString &_url, bool useDOMFormat, WId windowId, KHttpCookieList *pendingCookies = 0);
+    QString findCookies(const QString &_url, bool useDOMFormat, WId windowId, KHttpCookieList *pendingCookies = nullptr);
 
     /**
      * This function parses cookie_headers and returns a linked list of
@@ -406,7 +406,7 @@
     /**
      * Parses _url and returns the FQDN (_fqdn) and path (_path).
      */
-    static bool parseUrl(const QString &_url, QString &_fqdn, QString &_path, int *port = 0);
+    static bool parseUrl(const QString &_url, QString &_fqdn, QString &_path, int *port = nullptr);
 
     /**
      * Returns a list of domains in @p _domainList relevant for this host.
Index: src/ioslaves/http/kcookiejar/kcookiejar.cpp
===================================================================
--- src/ioslaves/http/kcookiejar/kcookiejar.cpp
+++ src/ioslaves/http/kcookiejar/kcookiejar.cpp
@@ -108,7 +108,7 @@
             "dd-MMM-yyyy HH:mm:ss 'GMT'", /* cookies.test: Y2K38 problem: 06-Dec-2039 00:30:42 GMT */
             "MMM dd HH:mm:ss yyyy 'GMT'", /* cookies.test: Non-standard expiration dates: Sep 12 07:00:00 2020 GMT */
             "MMM dd yyyy HH:mm:ss 'GMT'", /* cookies.test: Non-standard expiration dates: Sep 12 2020 07:00:00 GMT */
-            0
+            nullptr
         };
 
         for (int i = 0; date_formats[i]; ++i) {
@@ -377,10 +377,10 @@
 
     KHttpCookieList allCookies;
     for (QStringList::ConstIterator it = domains.constBegin(), itEnd = domains.constEnd();; ++it) {
-        KHttpCookieList *cookieList = 0;
+        KHttpCookieList *cookieList = nullptr;
         if (it == itEnd) {
             cookieList = pendingCookies; // Add pending cookies
-            pendingCookies = 0;
+            pendingCookies = nullptr;
             if (!cookieList) {
                 break;
             }
@@ -1389,7 +1389,7 @@
     return result;
 }
 
-static QString extractHostAndPorts(const QString &str, QList<int> *ports = 0)
+static QString extractHostAndPorts(const QString &str, QList<int> *ports = nullptr)
 {
     if (str.isEmpty()) {
         return str;
@@ -1477,7 +1477,7 @@
             bool secure = false;
             bool httpOnly = false;
             bool explicitPath = false;
-            const char *value = 0;
+            const char *value = nullptr;
             if ((version == 2) || (protVer >= 200)) {
                 if (protVer >= 200) {
                     protVer -= 200;
Index: src/ioslaves/http/kcookiejar/kcookieserver.h
===================================================================
--- src/ioslaves/http/kcookiejar/kcookieserver.h
+++ src/ioslaves/http/kcookiejar/kcookieserver.h
@@ -81,7 +81,7 @@
     void shutdown();
 
 public:
-    bool cookiesPending(const QString &url, KHttpCookieList *cookieList = 0);
+    bool cookiesPending(const QString &url, KHttpCookieList *cookieList = nullptr);
     void addCookies(const QString &url, const QByteArray &cookieHeader,
                     qlonglong windowId, bool useDOMFormat);
     void checkCookies(KHttpCookieList *cookieList);
Index: src/ioslaves/http/kcookiejar/kcookieserver.cpp
===================================================================
--- src/ioslaves/http/kcookiejar/kcookieserver.cpp
+++ src/ioslaves/http/kcookiejar/kcookieserver.cpp
@@ -175,7 +175,7 @@
     if (!mAdvicePending) {
         mAdvicePending = true;
         while (!mPendingCookies->isEmpty()) {
-            checkCookies(0, windowId);
+            checkCookies(nullptr, windowId);
         }
         mAdvicePending = false;
     }
@@ -234,7 +234,7 @@
     }
     //qDebug() << shownCookies;
 
-    KCookieWin *kw = new KCookieWin(0L, currentList,
+    KCookieWin *kw = new KCookieWin(nullptr, currentList,
                                     mCookieJar->preferredDefaultPolicy(),
                                     mCookieJar->showCookieDetails());
     if (windowId > 0) {
Index: src/ioslaves/http/kcookiejar/kcookiewin.h
===================================================================
--- src/ioslaves/http/kcookiejar/kcookiewin.h
+++ src/ioslaves/http/kcookiejar/kcookiewin.h
@@ -39,7 +39,7 @@
     Q_OBJECT
 
 public:
-    KCookieDetail(KHttpCookieList cookieList, int cookieCount, QWidget *parent = 0);
+    KCookieDetail(KHttpCookieList cookieList, int cookieCount, QWidget *parent = nullptr);
     ~KCookieDetail();
 
 private Q_SLOTS:
Index: src/ioslaves/telnet/ktelnetservice.cpp
===================================================================
--- src/ioslaves/telnet/ktelnetservice.cpp
+++ src/ioslaves/telnet/ktelnetservice.cpp
@@ -64,7 +64,7 @@
     }
 
     if (!KAuthorized::authorize(QStringLiteral("shell_access"))) {
-        QMessageBox::critical(0, i18n("Access denied"),
+        QMessageBox::critical(nullptr, i18n("Access denied"),
                            i18n("You do not have permission to access the %1 protocol.", url.scheme()));
         return 3;
     }
Index: src/ioslaves/trash/kcmtrash.cpp
===================================================================
--- src/ioslaves/trash/kcmtrash.cpp
+++ src/ioslaves/trash/kcmtrash.cpp
@@ -314,7 +314,7 @@
     mLimitReachedAction->setWhatsThis(xi18nc("@info:whatsthis",
                                       "<para>When the size limit is reached, it will prefer to delete the type of files that you specify, first. "
                                       "If this is set to warn you, it will do so instead of automatically deleting files.</para>"));
-    sizeWidgetLayout->addRow(0, mLimitReachedAction);
+    sizeWidgetLayout->addRow(nullptr, mLimitReachedAction);
 
     layout->addStretch();
 }
Index: src/ioslaves/trash/kio_trash.cpp
===================================================================
--- src/ioslaves/trash/kio_trash.cpp
+++ src/ioslaves/trash/kio_trash.cpp
@@ -53,7 +53,7 @@
         // necessary to use other kio slaves
         QCoreApplication app(argc, argv);
 
-        KIO::setDefaultJobUiDelegateExtension(0);
+        KIO::setDefaultJobUiDelegateExtension(nullptr);
         // start the slave
         TrashProtocol slave(argv[1], argv[2], argv[3]);
         slave.dispatchLoop();
Index: src/ioslaves/trash/tests/testtrash.cpp
===================================================================
--- src/ioslaves/trash/tests/testtrash.cpp
+++ src/ioslaves/trash/tests/testtrash.cpp
@@ -465,7 +465,7 @@
     }
 
     KIO::CopyJob *job = KIO::move(u, QUrl(QStringLiteral("trash:/")), KIO::HideProgressInfo);
-    job->setUiDelegate(0); // no skip dialog, thanks
+    job->setUiDelegate(nullptr); // no skip dialog, thanks
     bool ok = job->exec();
     QVERIFY(!ok);
     QMap<QString, QString> metaData = job->metaData();
@@ -974,7 +974,7 @@
     }
 
     KIO::CopyJob *job = KIO::move(u, QUrl(QStringLiteral("trash:/")), KIO::HideProgressInfo);
-    job->setUiDelegate(0); // no skip dialog, thanks
+    job->setUiDelegate(nullptr); // no skip dialog, thanks
     bool ok = job->exec();
     QVERIFY(!ok);
     QMap<QString, QString> metaData = job->metaData();
Index: src/ioslaves/trash/trashimpl.cpp
===================================================================
--- src/ioslaves/trash/trashimpl.cpp
+++ src/ioslaves/trash/trashimpl.cpp
@@ -478,7 +478,7 @@
 
     //qCDebug(KIO_TRASH) << urlSrc << "->" << urlDest;
     KIO::CopyJob *job = KIO::moveAs(urlSrc, urlDest, KIO::HideProgressInfo);
-    job->setUiDelegate(0);
+    job->setUiDelegate(nullptr);
     connect(job, SIGNAL(result(KJob*)),
             this, SLOT(jobFinished(KJob*)));
     enterLoop();
@@ -538,7 +538,7 @@
     QUrl urlDest = QUrl::fromLocalFile(dest);
     //qCDebug(KIO_TRASH) << "copying" << src << "to" << dest;
     KIO::CopyJob *job = KIO::copyAs(urlSrc, urlDest, KIO::HideProgressInfo);
-    job->setUiDelegate(0);
+    job->setUiDelegate(nullptr);
     connect(job, SIGNAL(result(KJob*)),
             this, SLOT(jobFinished(KJob*)));
     enterLoop();
@@ -871,7 +871,7 @@
             ep = readdir(dp);   // ignore '.' and '..' dirent
             ep = readdir(dp);   // look for third file
             closedir(dp);
-            if (ep != 0) {
+            if (ep != nullptr) {
                 //qCDebug(KIO_TRASH) << ep->d_name << "in" << infoPath << "-> not empty";
                 return false; // not empty
             }
Index: src/kcms/kio/kcookiesmain.cpp
===================================================================
--- src/kcms/kio/kcookiesmain.cpp
+++ src/kcms/kio/kcookiesmain.cpp
@@ -29,7 +29,7 @@
 KCookiesMain::KCookiesMain (QWidget* parent, const QVariantList&)
     : KCModule (/*KioConfigFactory::componentData(),*/ parent)
 {
-    management = 0;
+    management = nullptr;
     bool managerOK = true;
 
     QVBoxLayout* layout = new QVBoxLayout (this);
Index: src/kcms/kio/kcookiesmanagement.cpp
===================================================================
--- src/kcms/kio/kcookiesmanagement.cpp
+++ src/kcms/kio/kcookiesmanagement.cpp
@@ -59,7 +59,7 @@
 CookieListViewItem::CookieListViewItem(QTreeWidget *parent, const QString &dom)
                    :QTreeWidgetItem(parent)
 {
-    init( 0, dom );
+    init( nullptr, dom );
 }
 
 CookieListViewItem::CookieListViewItem(QTreeWidgetItem *parent, CookieProp *cookie)
@@ -102,7 +102,7 @@
 CookieProp* CookieListViewItem::leaveCookie()
 {
     CookieProp *ret = mCookie;
-    mCookie = 0;
+    mCookie = nullptr;
     return ret;
 }
 
@@ -342,7 +342,7 @@
 {
   if (item) {
     CookieListViewItem* cookieItem = static_cast<CookieListViewItem*>(item);
-    CookieProp *cookie = (cookieItem ? cookieItem->cookie() : 0);
+    CookieProp *cookie = (cookieItem ? cookieItem->cookie() : nullptr);
 
     if (cookie) {
       if (cookie->allLoaded || cookieDetails(cookie)) {
Index: src/kcms/kio/kcookiespolicies.cpp
===================================================================
--- src/kcms/kio/kcookiespolicies.cpp
+++ src/kcms/kio/kcookiespolicies.cpp
@@ -216,7 +216,7 @@
 bool KCookiesPolicies::handleDuplicate (const QString& domain, int advice)
 {
     QTreeWidgetItem* item = mUi.policyTreeWidget->topLevelItem (0);
-    while (item != 0) {
+    while (item != nullptr) {
         if (item->text (0) == domain) {
             const int res = KMessageBox::warningContinueCancel (this,
                             i18n ("<qt>A policy already exists for"
@@ -240,7 +240,7 @@
 
 void KCookiesPolicies::deletePressed()
 {
-    QTreeWidgetItem* nextItem = 0L;
+    QTreeWidgetItem* nextItem = nullptr;
 
     Q_FOREACH (QTreeWidgetItem * item, mUi.policyTreeWidget->selectedItems()) {
         nextItem = mUi.policyTreeWidget->itemBelow (item);
@@ -388,7 +388,7 @@
         QDBusInterface kded (QStringLiteral("org.kde.kcookiejar5"), QStringLiteral("/modules/kcookiejar"), QStringLiteral("org.kde.KCookieServer"), QDBusConnection::sessionBus());
         QDBusReply<void> reply = kded.call (QStringLiteral("reloadPolicy"));
         if (!reply.isValid())
-            KMessageBox::sorry (0, i18n ("Unable to communicate with the cookie handler service.\n"
+            KMessageBox::sorry (nullptr, i18n ("Unable to communicate with the cookie handler service.\n"
                                          "Any changes you made will not take effect until the service "
                                          "is restarted."));
     }
Index: src/kcms/kio/kcookiespolicyselectiondlg.h
===================================================================
--- src/kcms/kio/kcookiespolicyselectiondlg.h
+++ src/kcms/kio/kcookiespolicyselectiondlg.h
@@ -69,7 +69,7 @@
     Q_OBJECT
 
 public:
-    explicit KCookiesPolicySelectionDlg (QWidget* parent = 0, Qt::WindowFlags f = 0);
+    explicit KCookiesPolicySelectionDlg (QWidget* parent = nullptr, Qt::WindowFlags f = nullptr);
     ~KCookiesPolicySelectionDlg () {}
 
     int advice() const;
Index: src/kcms/kio/kcookiespolicyselectiondlg.cpp
===================================================================
--- src/kcms/kio/kcookiespolicyselectiondlg.cpp
+++ src/kcms/kio/kcookiespolicyselectiondlg.cpp
@@ -63,7 +63,7 @@
 KCookiesPolicySelectionDlg::KCookiesPolicySelectionDlg (QWidget* parent, Qt::WindowFlags flags)
     : QDialog (parent, flags)
       , mOldPolicy(-1)
-      , mButtonBox(0)
+      , mButtonBox(nullptr)
 {
     QWidget *mainWidget = new QWidget(this);
     QVBoxLayout *mainLayout = new QVBoxLayout;
Index: src/kcms/kio/kproxydlg.cpp
===================================================================
--- src/kcms/kio/kproxydlg.cpp
+++ src/kcms/kio/kproxydlg.cpp
@@ -296,7 +296,7 @@
     setProxyInformation(mProxyMap.value(QStringLiteral("HttpsProxy")), proxyType, mUi.manualProxyHttpsEdit, mUi.systemProxyHttpsEdit, mUi.manualProxyHttpsSpinBox, QStringLiteral("http"), HideHttpsUrlScheme);
     setProxyInformation(mProxyMap.value(QStringLiteral("FtpProxy")), proxyType, mUi.manualProxyFtpEdit, mUi.systemProxyFtpEdit, mUi.manualProxyFtpSpinBox, QStringLiteral("ftp"), HideFtpUrlScheme);
     setProxyInformation(mProxyMap.value(QStringLiteral("SocksProxy")), proxyType, mUi.manualProxySocksEdit, mUi.systemProxySocksEdit, mUi.manualProxySocksSpinBox, QStringLiteral("socks"), HideSocksUrlScheme);
-    setProxyInformation(mProxyMap.value(QStringLiteral("NoProxy")), proxyType, mUi.manualNoProxyEdit, mUi.systemNoProxyEdit, 0, QString(), HideNone);
+    setProxyInformation(mProxyMap.value(QStringLiteral("NoProxy")), proxyType, mUi.manualNoProxyEdit, mUi.systemNoProxyEdit, nullptr, QString(), HideNone);
 
     // Check the "Use this proxy server for all protocols" if all the proxy URLs are the same...
     const QString httpProxy(mUi.manualProxyHttpEdit->text());
Index: src/kcms/kio/ksaveioconfig.h
===================================================================
--- src/kcms/kio/ksaveioconfig.h
+++ src/kcms/kio/ksaveioconfig.h
@@ -73,10 +73,10 @@
 void setAutoResume (bool);
 
 /** Update all running io-slaves */
-void updateRunningIOSlaves (QWidget* parent = 0L);
+void updateRunningIOSlaves (QWidget* parent = nullptr);
 
 /** Update proxy scout */
-void updateProxyScout (QWidget* parent = 0L);
+void updateProxyScout (QWidget* parent = nullptr);
 }
 
 #endif
Index: src/kcms/kio/ksaveioconfig.cpp
===================================================================
--- src/kcms/kio/ksaveioconfig.cpp
+++ src/kcms/kio/ksaveioconfig.cpp
@@ -42,7 +42,7 @@
 Q_GLOBAL_STATIC(KSaveIOConfigPrivate, d)
 
 KSaveIOConfigPrivate::KSaveIOConfigPrivate ()
-                     : config(0), http_config(0)
+                     : config(nullptr), http_config(nullptr)
 {
 }
 
@@ -84,9 +84,9 @@
 void KSaveIOConfig::reparseConfiguration ()
 {
   delete d->config;
-  d->config = 0;
+  d->config = nullptr;
   delete d->http_config;
-  d->http_config = 0;
+  d->http_config = nullptr;
 }
 
 void KSaveIOConfig::setReadTimeout( int _timeout )
Index: src/kcms/kio/useragentdlg.cpp
===================================================================
--- src/kcms/kio/useragentdlg.cpp
+++ src/kcms/kio/useragentdlg.cpp
@@ -54,8 +54,8 @@
 
 UserAgentDlg::UserAgentDlg (QWidget* parent, const QVariantList&)
     : KCModule (/*ioConfigFactory::componentData(),*/ parent),
-      m_userAgentInfo (0),
-      m_config (0)
+      m_userAgentInfo (nullptr),
+      m_config (nullptr)
 {
     ui.setupUi (this);
     ui.newButton->setIcon (QIcon::fromTheme(QStringLiteral("list-add")));
Index: src/kcms/kio/useragentselectordlg.h
===================================================================
--- src/kcms/kio/useragentselectordlg.h
+++ src/kcms/kio/useragentselectordlg.h
@@ -33,7 +33,7 @@
     Q_OBJECT
 
 public:
-    explicit UserAgentSelectorDlg (UserAgentInfo* info, QWidget* parent = 0, Qt::WindowFlags f = 0);
+    explicit UserAgentSelectorDlg (UserAgentInfo* info, QWidget* parent = nullptr, Qt::WindowFlags f = nullptr);
     ~UserAgentSelectorDlg();
 
     void setSiteName (const QString&);
Index: src/kcms/kio/useragentselectordlg.cpp
===================================================================
--- src/kcms/kio/useragentselectordlg.cpp
+++ src/kcms/kio/useragentselectordlg.cpp
@@ -69,7 +69,7 @@
 UserAgentSelectorDlg::UserAgentSelectorDlg (UserAgentInfo* info, QWidget* parent, Qt::WindowFlags f)
     : QDialog (parent, f),
       mUserAgentInfo (info),
-      mButtonBox(0)
+      mButtonBox(nullptr)
 {
     QWidget *mainWidget = new QWidget(this);
     QVBoxLayout *mainLayout = new QVBoxLayout;
Index: src/kcms/webshortcuts/main.cpp
===================================================================
--- src/kcms/webshortcuts/main.cpp
+++ src/kcms/webshortcuts/main.cpp
@@ -36,7 +36,7 @@
 
 KURIFilterModule::KURIFilterModule(QWidget *parent, const QVariantList &args)
     : KCModule(parent, args),
-      m_widget(0)
+      m_widget(nullptr)
 {
     KAboutData *about = new KAboutData(QStringLiteral("kcm_webshortcuts"), i18n("Web Shortcuts"),
                                        QStringLiteral("0.1"), i18n("Configure enhanced browsing features"),
@@ -64,7 +64,7 @@
     for (; it != end; ++it) {
         KUriFilterPlugin *plugin = (*it)->createInstance<KUriFilterPlugin>(this);
         if (plugin) {
-            KCModule *module = plugin->configModule(this, 0);
+            KCModule *module = plugin->configModule(this, nullptr);
             if (module) {
                 modules.append(module);
                 helper.insert(plugin->configName(), module);
Index: src/kiod/kiod_main.cpp
===================================================================
--- src/kiod/kiod_main.cpp
+++ src/kiod/kiod_main.cpp
@@ -48,7 +48,7 @@
     // Make sure this method is only called with valid module names.
     Q_ASSERT(name.indexOf('/') == -1);
 
-    KDEDModule *module = m_modules.value(name, 0);
+    KDEDModule *module = m_modules.value(name, nullptr);
     if (module) {
         return;
     }
Index: src/kpac/proxyscout.cpp
===================================================================
--- src/kpac/proxyscout.cpp
+++ src/kpac/proxyscout.cpp
@@ -82,10 +82,10 @@
 ProxyScout::ProxyScout(QObject *parent, const QList<QVariant> &)
     : KDEDModule(parent),
       m_componentName(QStringLiteral("proxyscout")),
-      m_downloader(0),
-      m_script(0),
+      m_downloader(nullptr),
+      m_script(nullptr),
       m_suspendTime(0),
-      m_watcher(0),
+      m_watcher(nullptr),
       m_networkConfig(new QNetworkConfigurationManager(this))
 {
     connect(m_networkConfig, SIGNAL(configurationChanged(QNetworkConfiguration)), SLOT(disconnectNetwork(QNetworkConfiguration)));
@@ -101,7 +101,7 @@
     QUrl url(checkUrl);
 
     if (m_suspendTime) {
-        if (std::time(0) - m_suspendTime < 300) {
+        if (std::time(nullptr) - m_suspendTime < 300) {
             return QStringList(QStringLiteral("DIRECT"));
         }
         m_suspendTime = 0;
@@ -130,7 +130,7 @@
     QUrl url(checkUrl);
 
     if (m_suspendTime) {
-        if (std::time(0) - m_suspendTime < 300) {
+        if (std::time(nullptr) - m_suspendTime < 300) {
             return QStringLiteral("DIRECT");
         }
         m_suspendTime = 0;
@@ -156,17 +156,17 @@
 
 void ProxyScout::blackListProxy(const QString &proxy)
 {
-    m_blackList[ proxy ] = std::time(0);
+    m_blackList[ proxy ] = std::time(nullptr);
 }
 
 void ProxyScout::reset()
 {
     delete m_script;
-    m_script = 0;
+    m_script = nullptr;
     delete m_downloader;
-    m_downloader = 0;
+    m_downloader = nullptr;
     delete m_watcher;
-    m_watcher = 0;
+    m_watcher = nullptr;
     m_blackList.clear();
     m_suspendTime = 0;
     KProtocolManager::reparseConfiguration();
@@ -178,7 +178,7 @@
     case KProtocolManager::WPADProxy:
         if (m_downloader && !qobject_cast<Discovery *>(m_downloader)) {
             delete m_downloader;
-            m_downloader = 0;
+            m_downloader = nullptr;
         }
         if (!m_downloader) {
             m_downloader = new Discovery(this);
@@ -188,7 +188,7 @@
     case KProtocolManager::PACProxy: {
         if (m_downloader && !qobject_cast<Downloader *>(m_downloader)) {
             delete m_downloader;
-            m_downloader = 0;
+            m_downloader = nullptr;
         }
         if (!m_downloader) {
             m_downloader = new Downloader(this);
@@ -204,7 +204,7 @@
             proxyScriptFileChanged(url.path());
         } else {
             delete m_watcher;
-            m_watcher = 0;
+            m_watcher = nullptr;
             m_downloader->download(url);
         }
         break;
@@ -272,7 +272,7 @@
 
     // Suppress further attempts for 5 minutes
     if (!success) {
-        m_suspendTime = std::time(0);
+        m_suspendTime = std::time(nullptr);
     }
 }
 
@@ -334,7 +334,7 @@
 
             if (type == Direct || !m_blackList.contains(address)) {
                 proxyList << address;
-            } else if (std::time(0) - m_blackList[address] > 1800) { // 30 minutes
+            } else if (std::time(nullptr) - m_blackList[address] > 1800) { // 30 minutes
                 // black listing expired
                 m_blackList.remove(address);
                 proxyList << address;
Index: src/kpac/script.cpp
===================================================================
--- src/kpac/script.cpp
+++ src/kpac/script.cpp
@@ -370,7 +370,7 @@
         return engine->undefinedValue();
     }
 
-    static const char *const days[] = { "sun", "mon", "tue", "wed", "thu", "fri", "sat", 0 };
+    static const char *const days[] = { "sun", "mon", "tue", "wed", "thu", "fri", "sat", nullptr };
 
     const int d1 = findString(context->argument(0).toString(), days);
     if (d1 == -1) {
@@ -409,7 +409,7 @@
     }
 
     static const char *const months[] = { "jan", "feb", "mar", "apr", "may", "jun",
-                                          "jul", "aug", "sep", "oct", "nov", "dec", 0
+                                          "jul", "aug", "sep", "oct", "nov", "dec", nullptr
                                         };
 
     QVector<int> values;
Index: src/kpasswdserver/kpasswdserver.cpp
===================================================================
--- src/kpasswdserver/kpasswdserver.cpp
+++ src/kpasswdserver/kpasswdserver.cpp
@@ -73,7 +73,7 @@
     KIO::AuthInfo::registerMetaTypes();
 
     m_seqNr = 0;
-    m_wallet = 0;
+    m_wallet = nullptr;
     m_walletDisabled = false;
 
     KPasswdServerAdaptor *adaptor = new KPasswdServerAdaptor(this);
@@ -503,12 +503,12 @@
 {
     if ( m_wallet && !m_wallet->isOpen() ) { // forced closed
         delete m_wallet;
-        m_wallet = 0;
+        m_wallet = nullptr;
     }
     if ( !m_wallet )
         m_wallet = KWallet::Wallet::openWallet(
             KWallet::Wallet::NetworkWallet(), (WId)(windowId));
-    return m_wallet != 0;
+    return m_wallet != nullptr;
 }
 #endif
 
@@ -577,7 +577,7 @@
             buttonBox->button(QDialogButtonBox::Yes)->setText(i18nc("@action:button filter-continue", "Retry"));
 
             KMessageBox::createKMessageBox(dlg, buttonBox, QMessageBox::Warning, prompt,
-                                           QStringList(), QString(), 0,
+                                           QStringList(), QString(), nullptr,
                                            (KMessageBox::Notify | KMessageBox::NoExec));
 
         #ifndef Q_WS_WIN
@@ -655,7 +655,7 @@
       Q_FOREACH(AuthInfoContainer *current, *authList)
       {
           if (current->expire == AuthInfoContainer::expTime &&
-              static_cast<qulonglong>(time(0)) > current->expireTime)
+              static_cast<qulonglong>(time(nullptr)) > current->expireTime)
           {
               authList->removeOne(current);
               delete current;
@@ -677,7 +677,7 @@
           }
       }
    }
-   return 0;
+   return nullptr;
 }
 
 void
@@ -718,7 +718,7 @@
       authList = new AuthInfoContainerList;
       m_authDict.insert(key, authList);
    }
-   AuthInfoContainer *authItem = 0;
+   AuthInfoContainer *authItem = nullptr;
    Q_FOREACH(AuthInfoContainer* current, *authList)
    {
        if (current->info.realmValue == info.realmValue)
@@ -768,7 +768,7 @@
    }
    else if (current->expire == AuthInfoContainer::expTime)
    {
-      current->expireTime = time(0) + 10;
+      current->expireTime = time(nullptr) + 10;
    }
 
    // Update mWindowIdList
@@ -863,7 +863,7 @@
     qCDebug(category) << "Widget for" << request->windowId << QWidget::find((HWND)request->windowId);
 #endif
 
-    KPasswordDialog* dlg = new KPasswordDialog(0, dialogFlags);
+    KPasswordDialog* dlg = new KPasswordDialog(nullptr, dialogFlags);
     connect(dlg, SIGNAL(finished(int)), this, SLOT(passwordDialogDone(int)));
     connect(this, SIGNAL(destroyed(QObject*)), dlg, SLOT(deleteLater()));
 
Index: src/urifilters/ikws/ikwsopts.h
===================================================================
--- src/urifilters/ikws/ikwsopts.h
+++ src/urifilters/ikws/ikwsopts.h
@@ -37,7 +37,7 @@
     Q_OBJECT
 
 public:
-    explicit FilterOptions(const KAboutData* about, QWidget *parent = 0);
+    explicit FilterOptions(const KAboutData* about, QWidget *parent = nullptr);
 
     void load() Q_DECL_OVERRIDE;
     void save() Q_DECL_OVERRIDE;
Index: src/urifilters/ikws/ikwsopts.cpp
===================================================================
--- src/urifilters/ikws/ikwsopts.cpp
+++ src/urifilters/ikws/ikwsopts.cpp
@@ -417,7 +417,7 @@
 void FilterOptions::addSearchProvider()
 {
   QList<SearchProvider*> providers = m_providersModel->providers();
-  QPointer<SearchProviderDialog> dlg = new SearchProviderDialog(0, providers, this);
+  QPointer<SearchProviderDialog> dlg = new SearchProviderDialog(nullptr, providers, this);
 
   if (dlg->exec()) {
     m_providersModel->addProvider(dlg->provider());
Index: src/urifilters/ikws/ikwsopts_p.h
===================================================================
--- src/urifilters/ikws/ikwsopts_p.h
+++ src/urifilters/ikws/ikwsopts_p.h
@@ -28,7 +28,7 @@
     Q_OBJECT
 public:
     enum {Name,Shortcuts,Preferred,ColumnCount};
-    explicit ProvidersModel(QObject* parent = 0): QAbstractTableModel(parent){}
+    explicit ProvidersModel(QObject* parent = nullptr): QAbstractTableModel(parent){}
     ~ProvidersModel();
 
     Qt::ItemFlags flags(const QModelIndex& index) const Q_DECL_OVERRIDE;
@@ -69,7 +69,7 @@
     enum{ShortNameRole = Qt::UserRole};
 
 private:
-    explicit ProvidersListModel(QList<SearchProvider*>& providers, QObject* parent = 0) ;
+    explicit ProvidersListModel(QList<SearchProvider*>& providers, QObject* parent = nullptr) ;
 
 public:
     QVariant data(const QModelIndex& index, int role = Qt::DisplayRole) const Q_DECL_OVERRIDE;
Index: src/urifilters/ikws/kuriikwsfilter.h
===================================================================
--- src/urifilters/ikws/kuriikwsfilter.h
+++ src/urifilters/ikws/kuriikwsfilter.h
@@ -29,7 +29,7 @@
 {
     Q_OBJECT
 public:
-    explicit KAutoWebSearch(QObject *parent = 0, const QVariantList &args = QVariantList() );
+    explicit KAutoWebSearch(QObject *parent = nullptr, const QVariantList &args = QVariantList() );
     ~KAutoWebSearch();
     bool filterUri( KUriFilterData& ) const Q_DECL_OVERRIDE;
 
Index: src/urifilters/ikws/kuriikwsfiltereng.cpp
===================================================================
--- src/urifilters/ikws/kuriikwsfiltereng.cpp
+++ src/urifilters/ikws/kuriikwsfiltereng.cpp
@@ -56,7 +56,7 @@
 
 SearchProvider* KURISearchFilterEngine::webShortcutQuery(const QString& typedString, QString &searchTerm) const
 {
-  SearchProvider *provider = 0;
+  SearchProvider *provider = nullptr;
 
   if (m_bWebShortcutsEnabled)
   {
@@ -80,7 +80,7 @@
             qCDebug(category) << "found provider" << provider->desktopEntryName() << "searchTerm=" << searchTerm;
         } else {
           delete provider;
-          provider = 0;
+          provider = nullptr;
         }
       }
     }
@@ -92,7 +92,7 @@
 
 SearchProvider* KURISearchFilterEngine::autoWebSearchQuery(const QString& typedString, const QString &defaultShortcut) const
 {
-  SearchProvider *provider = 0;
+  SearchProvider *provider = nullptr;
   const QString defaultSearchProvider = (m_defaultWebShortcut.isEmpty() ? defaultShortcut : m_defaultWebShortcut);
 
   if (m_bWebShortcutsEnabled && !defaultSearchProvider.isEmpty())
@@ -435,7 +435,7 @@
   m_preferredWebShortcuts = group.readEntry("PreferredWebShortcuts", defaultPreferredShortcuts);
 
   // Use either a white space or a : as the keyword delimiter...
-  if (strchr (" :", m_cKeywordDelimiter) == 0)
+  if (strchr (" :", m_cKeywordDelimiter) == nullptr)
     m_cKeywordDelimiter = ':';
 
   qCDebug(category) << "Web Shortcuts Enabled: " << m_bWebShortcutsEnabled;
Index: src/urifilters/ikws/kurisearchfilter.h
===================================================================
--- src/urifilters/ikws/kurisearchfilter.h
+++ src/urifilters/ikws/kurisearchfilter.h
@@ -28,11 +28,11 @@
 {
     Q_OBJECT
 public:
-    explicit KUriSearchFilter(QObject *parent = 0, const QVariantList &args = QVariantList() );
+    explicit KUriSearchFilter(QObject *parent = nullptr, const QVariantList &args = QVariantList() );
     ~KUriSearchFilter();
 
     bool filterUri( KUriFilterData& ) const Q_DECL_OVERRIDE;
-    KCModule *configModule(QWidget *parent = 0, const char *name = 0) const Q_DECL_OVERRIDE;
+    KCModule *configModule(QWidget *parent = nullptr, const char *name = nullptr) const Q_DECL_OVERRIDE;
     QString configName() const Q_DECL_OVERRIDE;
 
 public Q_SLOTS:
Index: src/urifilters/ikws/searchprovider.cpp
===================================================================
--- src/urifilters/ikws/searchprovider.cpp
+++ src/urifilters/ikws/searchprovider.cpp
@@ -120,14 +120,14 @@
 {
     KService::Ptr service =
         KService::serviceByDesktopPath(QStringLiteral("searchproviders/%1.desktop").arg(name));
-    return service ? new SearchProvider(service) : 0;
+    return service ? new SearchProvider(service) : nullptr;
 }
 
 SearchProvider *SearchProvider::findByKey(const QString &key)
 {
     KService::List providers =
         KServiceTypeTrader::self()->query(QStringLiteral("SearchProvider"), QStringLiteral("'%1' in Keys").arg(key));
-    return providers.count() ? new SearchProvider(providers[0]) : 0;
+    return providers.count() ? new SearchProvider(providers[0]) : nullptr;
 }
 
 QList<SearchProvider *> SearchProvider::findAll()
Index: src/urifilters/ikws/searchproviderdlg.h
===================================================================
--- src/urifilters/ikws/searchproviderdlg.h
+++ src/urifilters/ikws/searchproviderdlg.h
@@ -32,7 +32,7 @@
     Q_OBJECT
 
 public:
-    explicit SearchProviderDialog(SearchProvider *provider, QList<SearchProvider*> &providers, QWidget *parent = 0);
+    explicit SearchProviderDialog(SearchProvider *provider, QList<SearchProvider*> &providers, QWidget *parent = nullptr);
 
     SearchProvider *provider() { return m_provider; }
 
Index: src/urifilters/ikws/searchproviderdlg.cpp
===================================================================
--- src/urifilters/ikws/searchproviderdlg.cpp
+++ src/urifilters/ikws/searchproviderdlg.cpp
@@ -142,7 +142,7 @@
 void SearchProviderDialog::accept()
 {
     if ((m_dlg.leQuery->text().indexOf(QStringLiteral("\\{")) == -1)
-        && KMessageBox::warningContinueCancel(0,
+        && KMessageBox::warningContinueCancel(nullptr,
             i18n("The Shortcut URL does not contain a \\{...} placeholder for the user query.\n"
                     "This means that the same page is always going to be visited, "
                     "regardless of the text typed in with the shortcut."),
Index: src/urifilters/shorturi/kshorturifilter.h
===================================================================
--- src/urifilters/shorturi/kshorturifilter.h
+++ src/urifilters/shorturi/kshorturifilter.h
@@ -49,7 +49,7 @@
      * @param parent the parent of this class.
      * @param name the internal name for this object.
      */
-    explicit KShortUriFilter( QObject *parent = 0, const QVariantList &args = QVariantList() );
+    explicit KShortUriFilter( QObject *parent = nullptr, const QVariantList &args = QVariantList() );
 
     /**
      * Destructor
Index: src/urifilters/shorturi/kshorturifilter.cpp
===================================================================
--- src/urifilters/shorturi/kshorturifilter.cpp
+++ src/urifilters/shorturi/kshorturifilter.cpp
@@ -535,7 +535,7 @@
 
 KCModule* KShortUriFilter::configModule( QWidget*, const char* ) const
 {
-    return 0; //new KShortUriOptions( parent, name );
+    return nullptr; //new KShortUriOptions( parent, name );
 }
 
 QString KShortUriFilter::configName() const
Index: src/widgets/accessmanager.h
===================================================================
--- src/widgets/accessmanager.h
+++ src/widgets/accessmanager.h
@@ -228,7 +228,7 @@
      * @see QNetworkAccessManager::createRequest
      * @internal
      */
-    QNetworkReply *createRequest(Operation op, const QNetworkRequest &req, QIODevice *outgoingData = 0) Q_DECL_OVERRIDE;
+    QNetworkReply *createRequest(Operation op, const QNetworkRequest &req, QIODevice *outgoingData = nullptr) Q_DECL_OVERRIDE;
 
 private:
     class AccessManagerPrivate;
@@ -286,7 +286,7 @@
     /**
      * Constructs a KNetworkCookieJar with parent @p parent.
      */
-    explicit CookieJar(QObject *parent = 0);
+    explicit CookieJar(QObject *parent = nullptr);
 
     /**
      * Destroys the KNetworkCookieJar.
Index: src/widgets/accessmanager.cpp
===================================================================
--- src/widgets/accessmanager.cpp
+++ src/widgets/accessmanager.cpp
@@ -72,7 +72,7 @@
     AccessManagerPrivate()
         : externalContentAllowed(true),
           emitReadyReadOnMetaDataChange(false),
-          window(0)
+          window(nullptr)
     {}
 
     void setMetaDataForRequest(QNetworkRequest request, KIO::MetaData &metaData);
@@ -224,7 +224,7 @@
     KIO::MetaData metaData;
     d->setMetaDataForRequest(req, metaData);
 
-    KIO::SimpleJob *kioJob = 0;
+    KIO::SimpleJob *kioJob = nullptr;
 
     switch (op) {
     case HeadOperation: {
Index: src/widgets/accessmanagerreply_p.h
===================================================================
--- src/widgets/accessmanagerreply_p.h
+++ src/widgets/accessmanagerreply_p.h
@@ -54,20 +54,20 @@
                                 const QNetworkRequest &request,
                                 KIO::SimpleJob *kioJob,
                                 bool emitReadyReadOnMetaDataChange = false,
-                                QObject *parent = 0);
+                                QObject *parent = nullptr);
 
     explicit AccessManagerReply(const QNetworkAccessManager::Operation op,
                                 const QNetworkRequest &request,
                                 const QByteArray &data,
                                 const QUrl &url,
                                 const KIO::MetaData &metaData,
-                                QObject *parent = 0);
+                                QObject *parent = nullptr);
 
     explicit AccessManagerReply(const QNetworkAccessManager::Operation op,
                                 const QNetworkRequest &request,
                                 QNetworkReply::NetworkError errorCode,
                                 const QString &errorMessage,
-                                QObject *parent = 0);
+                                QObject *parent = nullptr);
 
     virtual ~AccessManagerReply();
     qint64 bytesAvailable() const Q_DECL_OVERRIDE;
Index: src/widgets/delegateanimationhandler.cpp
===================================================================
--- src/widgets/delegateanimationhandler.cpp
+++ src/widgets/delegateanimationhandler.cpp
@@ -86,7 +86,7 @@
 AnimationState::AnimationState(const QModelIndex &index)
     : index(index), direction(QTimeLine::Forward),
       animating(false), jobAnimation(false), progress(0.0), m_fadeProgress(1.0),
-      m_jobAnimationAngle(0.0), renderCache(NULL), fadeFromRenderCache(NULL)
+      m_jobAnimationAngle(0.0), renderCache(nullptr), fadeFromRenderCache(nullptr)
 {
     creationTime.start();
 }
@@ -116,7 +116,7 @@
         m_fadeProgress = qMin(qreal(1.0), m_fadeProgress + delta);
         animating |= (m_fadeProgress < 1.0);
         if (m_fadeProgress == 1) {
-            setCachedRenderingFadeFrom(0);
+            setCachedRenderingFadeFrom(nullptr);
         }
     }
 
@@ -262,7 +262,7 @@
     // item will be drawn in two locations at the same time and hovered in one and
     // not the other. We can't tell them apart because they both have the same index.
     if (!view || static_cast<const ProtectedAccessor *>(view)->draggingState()) {
-        return NULL;
+        return nullptr;
     }
 
     AnimationState *state = findAnimationState(view, index);
@@ -337,7 +337,7 @@
             }
     }
 
-    return NULL;
+    return nullptr;
 }
 
 void DelegateAnimationHandler::addAnimationState(AnimationState *state, const QAbstractItemView *view)
Index: src/widgets/delegateanimationhandler_p.h
===================================================================
--- src/widgets/delegateanimationhandler_p.h
+++ src/widgets/delegateanimationhandler_p.h
@@ -88,7 +88,7 @@
     CachedRendering *takeCachedRendering()
     {
         CachedRendering *ret = renderCache;
-        renderCache = 0;
+        renderCache = nullptr;
         return ret;
     }
 
@@ -136,7 +136,7 @@
     typedef QMutableMapIterator<const QAbstractItemView *, AnimationList *> MutableAnimationListsIterator;
 
 public:
-    DelegateAnimationHandler(QObject *parent = 0);
+    DelegateAnimationHandler(QObject *parent = nullptr);
     ~DelegateAnimationHandler();
 
     AnimationState *animationState(const QStyleOption &option, const QModelIndex &index, const QAbstractItemView *view);
Index: src/widgets/dropjob.cpp
===================================================================
--- src/widgets/dropjob.cpp
+++ src/widgets/dropjob.cpp
@@ -382,7 +382,7 @@
 void DropJobPrivate::doCopyToDirectory()
 {
     Q_Q(DropJob);
-    KIO::CopyJob * job = 0;
+    KIO::CopyJob * job = nullptr;
     switch (m_dropAction) {
     case Qt::MoveAction:
         job = KIO::move(m_urls, m_destUrl, m_flags);
Index: src/widgets/executablefileopendialog_p.h
===================================================================
--- src/widgets/executablefileopendialog_p.h
+++ src/widgets/executablefileopendialog_p.h
@@ -36,7 +36,7 @@
         OpenFile = 42, ExecuteFile
     };
 
-    explicit ExecutableFileOpenDialog(QWidget* parent = 0);
+    explicit ExecutableFileOpenDialog(QWidget* parent = nullptr);
 
     bool isDontAskAgainChecked() const;
 
Index: src/widgets/fileundomanager.cpp
===================================================================
--- src/widgets/fileundomanager.cpp
+++ src/widgets/fileundomanager.cpp
@@ -236,7 +236,7 @@
 // order of the undo items.
 FileUndoManagerPrivate::FileUndoManagerPrivate(FileUndoManager *qq)
     : m_uiInterface(new FileUndoManager::UiInterface()),
-      m_undoJob(0), m_nextCommandIndex(1000), q(qq)
+      m_undoJob(nullptr), m_nextCommandIndex(1000), q(qq)
 {
     (void) new KIOFileUndoManagerAdaptor(this);
     const QString dbusPath = QStringLiteral("/FileUndoManager");
@@ -254,7 +254,7 @@
 {
     d = new FileUndoManagerPrivate(this);
     d->m_lock = false;
-    d->m_currentJob = 0;
+    d->m_currentJob = nullptr;
 }
 
 FileUndoManager::~FileUndoManager()
@@ -429,13 +429,13 @@
     m_dirCleanupStack.clear();
     m_fileCleanupStack.clear();
     m_undoState = REMOVINGDIRS;
-    m_undoJob = 0;
+    m_undoJob = nullptr;
 
     if (m_currentJob) {
         m_currentJob->kill();
     }
 
-    m_currentJob = 0;
+    m_currentJob = nullptr;
 
     if (step) {
         undoStep();
@@ -444,7 +444,7 @@
 
 void FileUndoManagerPrivate::slotResult(KJob *job)
 {
-    m_currentJob = 0;
+    m_currentJob = nullptr;
     if (job->error()) {
         m_uiInterface->jobError(static_cast<KIO::Job *>(job));
         delete m_undoJob;
@@ -476,7 +476,7 @@
 
 void FileUndoManagerPrivate::undoStep()
 {
-    m_currentJob = 0;
+    m_currentJob = nullptr;
 
     if (m_undoState == MAKINGDIRS) {
         stepMakingDirectories();
@@ -599,11 +599,11 @@
         addDirToUpdate(dir);
     } else {
         m_current.m_valid = false;
-        m_currentJob = 0;
+        m_currentJob = nullptr;
         if (m_undoJob) {
             //qDebug() << "deleting undojob";
             m_undoJob->emitResult();
-            m_undoJob = 0;
+            m_undoJob = nullptr;
         }
         QList<QUrl>::ConstIterator it = m_dirsToUpdate.constBegin();
         for (; it != m_dirsToUpdate.constEnd(); ++it) {
@@ -677,7 +677,7 @@
 {
 public:
     UiInterfacePrivate()
-        : m_parentWidget(0), m_showProgressInfo(true)
+        : m_parentWidget(nullptr), m_showProgressInfo(true)
     {}
     QWidget *m_parentWidget;
     bool m_showProgressInfo;
Index: src/widgets/jobuidelegate.cpp
===================================================================
--- src/widgets/jobuidelegate.cpp
+++ src/widgets/jobuidelegate.cpp
@@ -76,7 +76,7 @@
     while (w && w->parentWidget()) {
         w = w->parentWidget();
     }
-    return (w ? w->window() : 0);
+    return (w ? w->window() : nullptr);
 }
 
 class JobUiDelegateStatic : public QObject
@@ -355,7 +355,7 @@
         result = 0;
         break;
     }
-    KMessageBox::setDontShowAgainConfig(0);
+    KMessageBox::setDontShowAgainConfig(nullptr);
     return result;
 }
 
Index: src/widgets/joburlcache.cpp
===================================================================
--- src/widgets/joburlcache.cpp
+++ src/widgets/joburlcache.cpp
@@ -33,7 +33,7 @@
     return s_jobUrlCache()->instance;
 }
 
-JobUrlCache::JobUrlCache() : QObject(0)
+JobUrlCache::JobUrlCache() : QObject(nullptr)
 {
     org::kde::kuiserver *interface = new
     org::kde::kuiserver(QStringLiteral("org.kde.kuiserver"), QStringLiteral("/JobViewServer"), QDBusConnection::sessionBus(), this);
Index: src/widgets/kacleditwidget.h
===================================================================
--- src/widgets/kacleditwidget.h
+++ src/widgets/kacleditwidget.h
@@ -33,7 +33,7 @@
 {
     Q_OBJECT
 public:
-    explicit KACLEditWidget(QWidget *parent = 0);
+    explicit KACLEditWidget(QWidget *parent = nullptr);
     ~KACLEditWidget();
     KACL getACL() const;
     KACL getDefaultACL() const;
Index: src/widgets/kacleditwidget.cpp
===================================================================
--- src/widgets/kacleditwidget.cpp
+++ src/widgets/kacleditwidget.cpp
@@ -57,12 +57,12 @@
     const char *pixmapName;
     QPixmap *pixmap;
 } s_itemAttributes[] = {
-    { I18N_NOOP("Owner"), "user-grey", 0 },
-    { I18N_NOOP("Owning Group"), "group-grey", 0 },
-    { I18N_NOOP("Others"), "others-grey", 0 },
-    { I18N_NOOP("Mask"), "mask", 0 },
-    { I18N_NOOP("Named User"), "user", 0 },
-    { I18N_NOOP("Named Group"), "group", 0 },
+    { I18N_NOOP("Owner"), "user-grey", nullptr },
+    { I18N_NOOP("Owning Group"), "group-grey", nullptr },
+    { I18N_NOOP("Others"), "others-grey", nullptr },
+    { I18N_NOOP("Mask"), "mask", nullptr },
+    { I18N_NOOP("Named User"), "user", nullptr },
+    { I18N_NOOP("Named Group"), "group", nullptr },
 };
 
 class KACLEditWidget::KACLEditWidgetPrivate
@@ -423,7 +423,7 @@
       m_listView(listView), m_item(item), m_users(users), m_groups(groups),
       m_defaultUsers(defaultUsers), m_defaultGroups(defaultGroups),
       m_allowedTypes(allowedTypes), m_allowedDefaultTypes(allowedDefaultTypes),
-      m_defaultCB(0)
+      m_defaultCB(nullptr)
 {
     setObjectName(QStringLiteral("edit_entry_dialog"));
     setModal(true);
@@ -664,16 +664,16 @@
     m_yesPartialPixmap = new QPixmap(QStringLiteral(":/images/yespartial.png"));
 
     // fill the lists of all legal users and groups
-    struct passwd *user = 0;
+    struct passwd *user = nullptr;
     setpwent();
-    while ((user = getpwent()) != 0) {
+    while ((user = getpwent()) != nullptr) {
         m_allUsers << QString::fromLatin1(user->pw_name);
     }
     endpwent();
 
-    struct group *gr = 0;
+    struct group *gr = nullptr;
     setgrent();
-    while ((gr = getgrent()) != 0) {
+    while ((gr = getgrent()) != nullptr) {
         m_allGroups << QString::fromLatin1(gr->gr_name);
     }
     endgrent();
@@ -943,7 +943,7 @@
 {
     QTreeWidgetItemIterator it(this);
     KACLListViewItem *pItem;
-    while ((pItem = dynamic_cast<KACLListViewItem *>(*it)) != 0) {
+    while ((pItem = dynamic_cast<KACLListViewItem *>(*it)) != nullptr) {
         ++it;
         pItem->calcEffectiveRights();
     }
@@ -1000,7 +1000,7 @@
             return item;
         }
     }
-    return 0;
+    return nullptr;
 }
 
 unsigned short KACLListView::calculateMaskValue(bool defaults) const
@@ -1023,7 +1023,7 @@
     if (!hasDefaultEntries()) {
         allowedDefaultTypes |= User | Group;
     }
-    EditACLEntryDialog dlg(this, 0,
+    EditACLEntryDialog dlg(this, nullptr,
                            allowedUsers(false), allowedGroups(false),
                            allowedUsers(true), allowedGroups(true),
                            allowedTypes, allowedDefaultTypes, m_allowDefaults);
Index: src/widgets/kacleditwidget_p.h
===================================================================
--- src/widgets/kacleditwidget_p.h
+++ src/widgets/kacleditwidget_p.h
@@ -68,7 +68,7 @@
                      AllTypes = 63
                    };
 
-    KACLListView(QWidget *parent = 0);
+    KACLListView(QWidget *parent = nullptr);
     ~KACLListView();
 
     bool hasMaskEntry() const
@@ -98,8 +98,8 @@
     unsigned short calculateMaskValue(bool defaults) const;
     void calculateEffectiveRights();
 
-    QStringList allowedUsers(bool defaults, KACLListViewItem *allowedItem = 0);
-    QStringList allowedGroups(bool defaults, KACLListViewItem *allowedItem = 0);
+    QStringList allowedUsers(bool defaults, KACLListViewItem *allowedItem = nullptr);
+    QStringList allowedGroups(bool defaults, KACLListViewItem *allowedItem = nullptr);
 
     KACL getACL();
     KACL getDefaultACL();
Index: src/widgets/kautomount.cpp
===================================================================
--- src/widgets/kautomount.cpp
+++ src/widgets/kautomount.cpp
@@ -87,7 +87,7 @@
             const QUrl url = QUrl::fromLocalFile(mp->mountPoint());
             //qDebug() << "KAutoMount: m_strDevice=" << m_strDevice << " -> mountpoint=" << mountpoint;
             if (m_bShowFilemanagerWindow) {
-                KRun::runUrl(url, QStringLiteral("inode/directory"), 0 /*TODO - window*/);
+                KRun::runUrl(url, QStringLiteral("inode/directory"), nullptr /*TODO - window*/);
             }
             // Notify about the new stuff in that dir, in case of opened windows showing it
             org::kde::KDirNotify::emitFilesAdded(url);
Index: src/widgets/kdesktopfileactions.cpp
===================================================================
--- src/widgets/kdesktopfileactions.cpp
+++ src/widgets/kdesktopfileactions.cpp
@@ -72,14 +72,14 @@
 
     if (u.fileName() == QLatin1String(".directory")) {
         // We cannot execute a .directory file. Open with a text editor instead.
-        return KRun::runUrl(u, QStringLiteral("text/plain"), 0, false /*tempFile*/, false /*runExecutables*/, QString(), asn);
+        return KRun::runUrl(u, QStringLiteral("text/plain"), nullptr, false /*tempFile*/, false /*runExecutables*/, QString(), asn);
     }
 
     KDesktopFile cfg(u.toLocalFile());
     if (!cfg.desktopGroup().hasKey("Type")) {
         QString tmp = i18n("The desktop entry file %1 "
                            "has no Type=... entry.", u.toLocalFile());
-        KMessageBox::error(0, tmp);
+        KMessageBox::error(nullptr, tmp);
         return false;
     }
 
@@ -95,7 +95,7 @@
     }
 
     QString tmp = i18n("The desktop entry of type\n%1\nis unknown.",  cfg.readType());
-    KMessageBox::error(0, tmp);
+    KMessageBox::error(nullptr, tmp);
 
     return false;
 }
@@ -108,7 +108,7 @@
 
     if (dev.isEmpty()) {
         QString tmp = i18n("The desktop entry file\n%1\nis of type FSDevice but has no Dev=... entry.",  _url.toLocalFile());
-        KMessageBox::error(0, tmp);
+        KMessageBox::error(nullptr, tmp);
         return retval;
     }
 
@@ -117,7 +117,7 @@
     if (mp) {
         const QUrl mpURL = QUrl::fromLocalFile(mp->mountPoint());
         // Open a new window
-        retval = KRun::runUrl(mpURL, QStringLiteral("inode/directory"), 0 /*TODO - window*/, false, true, QString(), asn);
+        retval = KRun::runUrl(mpURL, QStringLiteral("inode/directory"), nullptr /*TODO - window*/, false, true, QString(), asn);
     } else {
         KConfigGroup cg = cfg.desktopGroup();
         bool ro = cg.readEntry("ReadOnly", false);
@@ -141,12 +141,12 @@
     if (!s.isValid())
     {
         QString tmp = i18n("The desktop entry file\n%1\nis not valid.", _url.toString());
-        KMessageBox::error(0, tmp);
+        KMessageBox::error(nullptr, tmp);
         return false;
     }
 
     QList<QUrl> lst;
-    return KRun::runService(s, lst, 0 /*TODO - window*/, false, QString(), asn);
+    return KRun::runService(s, lst, nullptr /*TODO - window*/, false, QString(), asn);
 }
 
 static bool runLink(const QUrl &_url, const KDesktopFile &cfg, const QByteArray &asn)
@@ -154,12 +154,12 @@
     QString u = cfg.readUrl();
     if (u.isEmpty()) {
         QString tmp = i18n("The desktop entry file\n%1\nis of type Link but has no URL=... entry.",  _url.toString());
-        KMessageBox::error(0, tmp);
+        KMessageBox::error(nullptr, tmp);
         return false;
     }
 
     QUrl url = QUrl::fromUserInput(u);
-    KRun *run = new KRun(url, (QWidget *)0, true, asn);
+    KRun *run = new KRun(url, (QWidget *)nullptr, true, asn);
 
     // X-KDE-LastOpenedWith holds the service desktop entry name that
     // was should be preferred for opening this URL if possible.
@@ -188,7 +188,7 @@
         const QString dev = cfg.readDevice();
         if (dev.isEmpty()) {
             QString tmp = i18n("The desktop entry file\n%1\nis of type FSDevice but has no Dev=... entry.",  _url.toLocalFile());
-            KMessageBox::error(0, tmp);
+            KMessageBox::error(nullptr, tmp);
             return result;
         }
 
@@ -321,7 +321,7 @@
             const QString dev = cfg.readDevice();
             if (dev.isEmpty()) {
                 QString tmp = i18n("The desktop entry file\n%1\nis of type FSDevice but has no Dev=... entry.",  path);
-                KMessageBox::error(0, tmp);
+                KMessageBox::error(nullptr, tmp);
                 return;
             }
             KMountPoint::Ptr mp = KMountPoint::currentMountPoints().findByDevice(dev);
@@ -387,7 +387,7 @@
 #endif
     } else {
         //qDebug() << action.name() << "first url's path=" << urls.first().toLocalFile() << "exec=" << action.exec();
-        KRun::run(action.exec(), urls, 0, action.text(), action.icon());
+        KRun::run(action.exec(), urls, nullptr, action.text(), action.icon());
         // The action may update the desktop file. Example: eject unmounts (#5129).
         org::kde::KDirNotify::emitFilesChanged(urls);
     }
Index: src/widgets/kdirlister.h
===================================================================
--- src/widgets/kdirlister.h
+++ src/widgets/kdirlister.h
@@ -38,7 +38,7 @@
     /**
      * Create a directory lister.
      */
-    KDirLister(QObject *parent = 0);
+    KDirLister(QObject *parent = nullptr);
 
     /**
      * Destroy the directory lister.
Index: src/widgets/kdirlister.cpp
===================================================================
--- src/widgets/kdirlister.cpp
+++ src/widgets/kdirlister.cpp
@@ -32,8 +32,8 @@
 {
 public:
     Private()
-        : errorParent(NULL),
-          window(NULL),
+        : errorParent(nullptr),
+          window(nullptr),
           autoErrorHandling(false)
     {}
 
@@ -46,7 +46,7 @@
 KDirLister::KDirLister(QObject *parent)
     : KCoreDirLister(parent), d(new Private)
 {
-    setAutoErrorHandlingEnabled(true, 0);
+    setAutoErrorHandlingEnabled(true, nullptr);
 }
 
 KDirLister::~KDirLister()
Index: src/widgets/kdirmodel.h
===================================================================
--- src/widgets/kdirmodel.h
+++ src/widgets/kdirmodel.h
@@ -53,7 +53,7 @@
     /**
      * @param parent parent qobject
      */
-    explicit KDirModel(QObject *parent = 0);
+    explicit KDirModel(QObject *parent = nullptr);
     ~KDirModel();
 
     /**
Index: src/widgets/kdirmodel.cpp
===================================================================
--- src/widgets/kdirmodel.cpp
+++ src/widgets/kdirmodel.cpp
@@ -175,8 +175,8 @@
 {
 public:
     KDirModelPrivate(KDirModel *model)
-        : q(model), m_dirLister(0),
-          m_rootNode(new KDirModelDirNode(0, KFileItem())),
+        : q(model), m_dirLister(nullptr),
+          m_rootNode(new KDirModelDirNode(nullptr, KFileItem())),
           m_dropsAllowed(KDirModel::NoDrops), m_jobTransfersVisible(false)
     {
     }
@@ -195,7 +195,7 @@
     void clear()
     {
         delete m_rootNode;
-        m_rootNode = new KDirModelDirNode(0, KFileItem());
+        m_rootNode = new KDirModelDirNode(nullptr, KFileItem());
     }
     // Emit expand for each parent and then return the
     // last known parent if there is no node for this url
@@ -276,14 +276,14 @@
 
     // Protocol mismatch? Don't even start comparing paths then. #171721
     if (url.scheme() != nodeUrl.scheme()) {
-        return 0;
+        return nullptr;
     }
 
     const QString pathStr = url.path(); // no trailing slash
     KDirModelDirNode *dirNode = m_rootNode;
 
     if (!pathStr.startsWith(nodeUrl.path())) {
-        return 0;
+        return nullptr;
     }
 
     for (;;) {
@@ -294,7 +294,7 @@
         if (!pathStr.startsWith(nodePath)) {
             qCWarning(KIO_WIDGETS) << "The kioslave for" << url.scheme() << "violates the hierarchy structure:"
                        << "I arrived at node" << nodePath << ", but" << pathStr << "does not start with that path.";
-            return 0;
+            return nullptr;
         }
 
         // E.g. pathStr is /a/b/c and nodePath is /a/. We want to find the node with url /a/b
@@ -560,7 +560,7 @@
         }
         rowNumbers.setBit(node->rowNumber(), 1); // O(n)
         removeFromNodeHash(node, url);
-        node = 0;
+        node = nullptr;
     }
 
     int start = -1;
@@ -695,7 +695,7 @@
 {
     const int numRows = dirNode->m_childNodes.count();
     if (numRows > 0) {
-        KDirModelNode *lastNode = 0;
+        KDirModelNode *lastNode = nullptr;
         for (KDirModelNode *node : dirNode->m_childNodes) {
             node->setPreview(QIcon());
             //node->setPreview(QIcon::fromTheme(node->item().iconName()));
@@ -825,7 +825,7 @@
                         DIR *dir = QT_OPENDIR(QFile::encodeName(path));
                         if (dir) {
                             count = 0;
-                            QT_DIRENT *dirEntry = 0;
+                            QT_DIRENT *dirEntry = nullptr;
                             while ((dirEntry = QT_READDIR(dir))) {
                                 if (dirEntry->d_name[0] == '.') {
                                     if (dirEntry->d_name[1] == '\0') { // skip "."
Index: src/widgets/kdynamicjobtracker.cpp
===================================================================
--- src/widgets/kdynamicjobtracker.cpp
+++ src/widgets/kdynamicjobtracker.cpp
@@ -40,8 +40,8 @@
 class KDynamicJobTracker::Private
 {
 public:
-    Private() : kuiserverTracker(0),
-        widgetTracker(0)
+    Private() : kuiserverTracker(nullptr),
+        widgetTracker(nullptr)
     {
     }
 
Index: src/widgets/kdynamicjobtracker_p.h
===================================================================
--- src/widgets/kdynamicjobtracker_p.h
+++ src/widgets/kdynamicjobtracker_p.h
@@ -38,7 +38,7 @@
      *
      * @param parent the parent of this object.
      */
-    KDynamicJobTracker(QObject *parent = 0);
+    KDynamicJobTracker(QObject *parent = nullptr);
 
     /**
      * Destroys this KDynamicJobTracker
Index: src/widgets/kfileitemactions.h
===================================================================
--- src/widgets/kfileitemactions.h
+++ src/widgets/kfileitemactions.h
@@ -61,7 +61,7 @@
      * Note that this instance must stay alive for at least as long as the popupmenu;
      * it has the slots for the actions created by addOpenWithActionsTo/addServiceActionsTo.
      */
-    KFileItemActions(QObject *parent = 0);
+    KFileItemActions(QObject *parent = nullptr);
 
     /**
      * Destructor
Index: src/widgets/kfileitemactions.cpp
===================================================================
--- src/widgets/kfileitemactions.cpp
+++ src/widgets/kfileitemactions.cpp
@@ -76,7 +76,7 @@
         }
 
         const int iSlashPos = i.indexOf('/');
-        Q_ASSERT(i > 0);
+        Q_ASSERT(i > nullptr);
         const QStringRef iSubType = i.midRef(iSlashPos+1);
 
         if (iSubType == "*") {
@@ -135,9 +135,9 @@
 KFileItemActionsPrivate::KFileItemActionsPrivate(KFileItemActions *qq)
     : QObject(),
       q(qq),
-      m_executeServiceActionGroup(static_cast<QWidget *>(0)),
-      m_runApplicationActionGroup(static_cast<QWidget *>(0)),
-      m_parentWidget(0),
+      m_executeServiceActionGroup(static_cast<QWidget *>(nullptr)),
+      m_runApplicationActionGroup(static_cast<QWidget *>(nullptr)),
+      m_parentWidget(nullptr),
       m_config(QStringLiteral("kservicemenurc"), KConfig::NoGlobals)
 {
     QObject::connect(&m_executeServiceActionGroup, SIGNAL(triggered(QAction*)),
@@ -779,7 +779,7 @@
 {
     const KService::List offers = associatedApplications(d->m_mimeTypeList, traderConstraint);
     if (offers.isEmpty()) {
-        return 0;
+        return nullptr;
     }
     return d->createAppAction(offers.first(), true);
 }
Index: src/widgets/kfileitemdelegate.h
===================================================================
--- src/widgets/kfileitemdelegate.h
+++ src/widgets/kfileitemdelegate.h
@@ -180,7 +180,7 @@
      *
      * @param parent The parent object for the delegate.
      */
-    explicit KFileItemDelegate(QObject *parent = 0);
+    explicit KFileItemDelegate(QObject *parent = nullptr);
 
     /**
      * Destroys the item delegate.
Index: src/widgets/kfileitemdelegate.cpp
===================================================================
--- src/widgets/kfileitemdelegate.cpp
+++ src/widgets/kfileitemdelegate.cpp
@@ -134,7 +134,7 @@
 KFileItemDelegate::Private::Private(KFileItemDelegate *parent)
     : shadowColor(Qt::transparent), shadowOffset(1, 1), shadowBlur(2), maximumSize(0, 0),
       showToolTipWhenElided(true), wrapMode(QTextOption::WrapAtWordBoundaryOrAnywhere), jobTransfersVisible(false),
-      animationHandler(new KIO::DelegateAnimationHandler(parent)), activeMargins(0)
+      animationHandler(new KIO::DelegateAnimationHandler(parent)), activeMargins(nullptr)
 {
 }
 
@@ -172,28 +172,28 @@
 
 QRect KFileItemDelegate::Private::addMargin(const QRect &rect, MarginType type) const
 {
-    Q_ASSERT(activeMargins != 0);
+    Q_ASSERT(activeMargins != nullptr);
     const Margin &m = activeMargins[type];
     return rect.adjusted(-m.left, -m.top, m.right, m.bottom);
 }
 
 QRect KFileItemDelegate::Private::subtractMargin(const QRect &rect, MarginType type) const
 {
-    Q_ASSERT(activeMargins != 0);
+    Q_ASSERT(activeMargins != nullptr);
     const Margin &m = activeMargins[type];
     return rect.adjusted(m.left, m.top, -m.right, -m.bottom);
 }
 
 QSize KFileItemDelegate::Private::addMargin(const QSize &size, MarginType type) const
 {
-    Q_ASSERT(activeMargins != 0);
+    Q_ASSERT(activeMargins != nullptr);
     const Margin &m = activeMargins[type];
     return QSize(size.width() + m.left + m.right, size.height() + m.top + m.bottom);
 }
 
 QSize KFileItemDelegate::Private::subtractMargin(const QSize &size, MarginType type) const
 {
-    Q_ASSERT(activeMargins != 0);
+    Q_ASSERT(activeMargins != nullptr);
     const Margin &m = activeMargins[type];
     return QSize(size.width() - m.left - m.right, size.height() - m.top - m.bottom);
 }
@@ -568,15 +568,15 @@
         const QModelIndex &index,
         const QAbstractItemView *view) const
 {
-    if (!option.widget->style()->styleHint(QStyle::SH_Widget_Animate, 0, option.widget)) {
-        return NULL;
+    if (!option.widget->style()->styleHint(QStyle::SH_Widget_Animate, nullptr, option.widget)) {
+        return nullptr;
     }
 
     if (index.column() == KDirModel::Name) {
         return animationHandler->animationState(option, index, view);
     }
 
-    return NULL;
+    return nullptr;
 }
 
 QPixmap KFileItemDelegate::Private::transition(const QPixmap &from, const QPixmap &to, qreal amount) const
@@ -1211,7 +1211,7 @@
     // Check if the item is being animated
     // ========================================================================
     KIO::AnimationState *state = d->animationState(opt, index, view);
-    KIO::CachedRendering *cache = 0;
+    KIO::CachedRendering *cache = nullptr;
     qreal progress = ((opt.state & QStyle::State_MouseOver) &&
                       index.column() == KDirModel::Name) ? 1.0 : 0.0;
     const QPoint iconPos   = d->iconPosition(opt);
@@ -1256,7 +1256,7 @@
             }
 
             if (!cache->checkValidity(opt.state)) {
-                if (opt.widget->style()->styleHint(QStyle::SH_Widget_Animate, 0, opt.widget)) {
+                if (opt.widget->style()->styleHint(QStyle::SH_Widget_Animate, nullptr, opt.widget)) {
                     // Fade over from the old icon to the new one
                     // Only start a new fade if the previous one is ready
                     // Else we may start racing when checkValidity() always returns false
@@ -1267,7 +1267,7 @@
                 d->gotNewIcon(index);
             }
             // If it wasn't valid, delete it
-            state->setCachedRendering(0);
+            state->setCachedRendering(nullptr);
         } else {
             // The cache may have been discarded, but the animation handler still needs to know about new icons
             d->gotNewIcon(index);
@@ -1408,7 +1408,7 @@
 void KFileItemDelegate::setEditorData(QWidget *editor, const QModelIndex &index) const
 {
     QTextEdit *textedit = qobject_cast<QTextEdit *>(editor);
-    Q_ASSERT(textedit != 0);
+    Q_ASSERT(textedit != nullptr);
 
     //Do not update existing text that the user may already have edited.
     //The models will call setEditorData(..) whenever the icon has changed,
@@ -1439,7 +1439,7 @@
 void KFileItemDelegate::setModelData(QWidget *editor, QAbstractItemModel *model, const QModelIndex &index) const
 {
     QTextEdit *textedit = qobject_cast<QTextEdit *>(editor);
-    Q_ASSERT(textedit != 0);
+    Q_ASSERT(textedit != nullptr);
 
     model->setData(index, textedit->toPlainText(), Qt::EditRole);
 }
@@ -1473,7 +1473,7 @@
     }
 
     QTextEdit *textedit = qobject_cast<QTextEdit *>(editor);
-    Q_ASSERT(textedit != 0);
+    Q_ASSERT(textedit != nullptr);
     const int frame = textedit->frameWidth();
     r.adjust(-frame, -frame, frame, frame);
 
Index: src/widgets/kopenwithdialog.h
===================================================================
--- src/widgets/kopenwithdialog.h
+++ src/widgets/kopenwithdialog.h
@@ -53,7 +53,7 @@
      * if the dialog is used to choose an application but not for some particular URLs.
      * @param parent parent widget
      */
-    explicit KOpenWithDialog(const QList<QUrl> &urls, QWidget *parent = 0);
+    explicit KOpenWithDialog(const QList<QUrl> &urls, QWidget *parent = nullptr);
 
     /**
      * Create a dialog that asks for a application to open a given
@@ -65,7 +65,7 @@
      * @param parent parent widget
      */
     KOpenWithDialog(const QList<QUrl> &urls, const QString &text, const QString &value,
-                    QWidget *parent = 0);
+                    QWidget *parent = nullptr);
 
     /**
      * Create a dialog to select a service for a given mimetype.
@@ -76,7 +76,7 @@
      * @param parent parent widget
      */
     KOpenWithDialog(const QString &mimeType, const QString &value,
-                    QWidget *parent = 0);
+                    QWidget *parent = nullptr);
 
     /**
      * Create a dialog to select an application
@@ -84,7 +84,7 @@
      *
      * @param parent parent widget
      */
-    KOpenWithDialog(QWidget *parent = 0);
+    KOpenWithDialog(QWidget *parent = nullptr);
 
     /**
      * Destructor
Index: src/widgets/kopenwithdialog.cpp
===================================================================
--- src/widgets/kopenwithdialog.cpp
+++ src/widgets/kopenwithdialog.cpp
@@ -70,7 +70,7 @@
 {
 public:
     AppNode()
-        : isDir(false), parent(0), fetched(false)
+        : isDir(false), parent(nullptr), fetched(false)
     {
     }
     ~AppNode()
@@ -356,7 +356,7 @@
 {
 public:
     KApplicationViewPrivate()
-        : appModel(0)
+        : appModel(nullptr)
     {
     }
 
@@ -580,9 +580,9 @@
 {
     bool bReadOnly = !KAuthorized::authorize(QStringLiteral("shell_access"));
     m_terminaldirty = false;
-    view = 0;
-    m_pService = 0;
-    curService = 0;
+    view = nullptr;
+    m_pService = nullptr;
+    curService = nullptr;
 
     QBoxLayout *topLayout = new QVBoxLayout;
     q->setLayout(topLayout);
@@ -688,7 +688,7 @@
         //    remember->setChecked(true);
         topLayout->addWidget(remember);
     } else {
-        remember = 0L;
+        remember = nullptr;
     }
 
     buttonBox = new QDialogButtonBox(q);
@@ -741,7 +741,7 @@
 void KOpenWithDialog::slotTextChanged()
 {
     // Forget about the service
-    d->curService = 0L;
+    d->curService = nullptr;
     d->buttonBox->button(QDialogButtonBox::Ok)->setEnabled(!d->edit->text().isEmpty());
 }
 
@@ -906,7 +906,7 @@
         // qDebug() << "Setting m_command to" << m_command;
     }
     if (m_pService && terminal->isChecked() != m_pService->terminal()) {
-        m_pService = 0;    // It's not exactly this service we're running
+        m_pService = nullptr;    // It's not exactly this service we're running
     }
 
     const bool bRemember = remember && remember->isChecked();
Index: src/widgets/kopenwithdialog_p.h
===================================================================
--- src/widgets/kopenwithdialog_p.h
+++ src/widgets/kopenwithdialog_p.h
@@ -34,7 +34,7 @@
     Q_OBJECT
 
 public:
-    KApplicationModel(QObject *parent = 0);
+    KApplicationModel(QObject *parent = nullptr);
     virtual ~KApplicationModel();
     bool canFetchMore(const QModelIndex &parent) const Q_DECL_OVERRIDE;
     int columnCount(const QModelIndex &parent = QModelIndex()) const Q_DECL_OVERRIDE;
@@ -68,7 +68,7 @@
     Q_OBJECT
 
 public:
-    KApplicationView(QWidget *parent = 0);
+    KApplicationView(QWidget *parent = nullptr);
     ~KApplicationView();
 
     void setModel(QAbstractItemModel *model) Q_DECL_OVERRIDE;
Index: src/widgets/kpropertiesdialog.h
===================================================================
--- src/widgets/kpropertiesdialog.h
+++ src/widgets/kpropertiesdialog.h
@@ -85,7 +85,7 @@
      * @param name is the internal name.
      */
     explicit KPropertiesDialog(const KFileItem &item,
-                               QWidget *parent = 0);
+                               QWidget *parent = nullptr);
 
     /**
      * \overload
@@ -100,7 +100,7 @@
      * @param name is the internal name.
      */
     explicit KPropertiesDialog(const KFileItemList &_items,
-                               QWidget *parent = 0);
+                               QWidget *parent = nullptr);
 
     /**
      * Brings up a Properties dialog. Convenience constructor for
@@ -115,7 +115,7 @@
      * and pass it to the other constructor.
      */
     explicit KPropertiesDialog(const QUrl &url,
-                               QWidget *parent = 0);
+                               QWidget *parent = nullptr);
 
     /**
      * Brings up a Properties dialog. Convenience constructor for
@@ -149,7 +149,7 @@
      */
     KPropertiesDialog(const QUrl &_tempUrl, const QUrl &_currentDir,
                       const QString &_defaultName,
-                      QWidget *parent = 0);
+                      QWidget *parent = nullptr);
 
     /**
      * Creates an empty properties dialog (for applications that want use
@@ -161,7 +161,7 @@
      * @param modal tells the dialog whether it should be modal.
      */
     explicit KPropertiesDialog(const QString &title,
-                               QWidget *parent = 0);
+                               QWidget *parent = nullptr);
 
     /**
      * Cleans up the properties dialog and frees any associated resources,
@@ -178,7 +178,7 @@
      *
      * @return true on successful dialog displaying (can be false on win32).
      */
-    static bool showDialog(const KFileItem &item, QWidget *parent = 0,
+    static bool showDialog(const KFileItem &item, QWidget *parent = nullptr,
                            bool modal = true);
 
     /**
@@ -189,7 +189,7 @@
      *
      * @return true on successful dialog displaying (can be false on win32).
      */
-    static bool showDialog(const QUrl &_url, QWidget *parent = 0,
+    static bool showDialog(const QUrl &_url, QWidget *parent = nullptr,
                            bool modal = true);
 
     /**
@@ -201,7 +201,7 @@
      *
      * @return true on successful dialog displaying (can be false on win32).
      */
-    static bool showDialog(const KFileItemList &_items, QWidget *parent = 0,
+    static bool showDialog(const KFileItemList &_items, QWidget *parent = nullptr,
                            bool modal = true);
 
     /**
Index: src/widgets/kpropertiesdialog.cpp
===================================================================
--- src/widgets/kpropertiesdialog.cpp
+++ src/widgets/kpropertiesdialog.cpp
@@ -174,7 +174,7 @@
     {
         q = qq;
         m_aborted = false;
-        fileSharePage = 0;
+        fileSharePage = nullptr;
     }
     ~KPropertiesDialogPrivate()
     {
@@ -750,11 +750,11 @@
 public:
     KFilePropsPluginPrivate()
     {
-        dirSizeJob = 0L;
-        dirSizeUpdateTimer = 0L;
-        m_lined = 0;
-        m_capacityBar = 0;
-        m_linkTargetLineEdit = 0;
+        dirSizeJob = nullptr;
+        dirSizeUpdateTimer = nullptr;
+        m_lined = nullptr;
+        m_capacityBar = nullptr;
+        m_linkTargetLineEdit = nullptr;
     }
     ~KFilePropsPluginPrivate()
     {
@@ -1089,8 +1089,8 @@
     if (!hasDirs) { // Only files [and symlinks]
         d->m_sizeLabel->setText(QStringLiteral("%1 (%2)").arg(KIO::convertSize(totalSize),
            QLocale().toString(totalSize)));
-        d->m_sizeDetermineButton = 0L;
-        d->m_sizeStopButton = 0L;
+        d->m_sizeDetermineButton = nullptr;
+        d->m_sizeStopButton = nullptr;
     } else { // Directory
         QHBoxLayout *sizelay = new QHBoxLayout();
         grid->addLayout(sizelay, curRow++, 2);
@@ -1307,9 +1307,9 @@
     // just in case you change something and try again :)
     d->m_sizeDetermineButton->setText(i18n("Refresh"));
     d->m_sizeDetermineButton->setEnabled(true);
-    d->dirSizeJob = 0;
+    d->dirSizeJob = nullptr;
     delete d->dirSizeUpdateTimer;
-    d->dirSizeUpdateTimer = 0;
+    d->dirSizeUpdateTimer = nullptr;
 }
 
 void KFilePropsPlugin::slotSizeDetermine()
@@ -1342,7 +1342,7 @@
         d->m_sizeLabel->setText(i18n("At least %1",
                                      KIO::convertSize(totalSize)));
         d->dirSizeJob->kill();
-        d->dirSizeJob = 0;
+        d->dirSizeJob = nullptr;
     }
     if (d->dirSizeUpdateTimer) {
         d->dirSizeUpdateTimer->stop();
@@ -1386,7 +1386,7 @@
         // qDebug() << "oldname = " << d->oldName;
         // qDebug() << "newname = " << n;
         if (d->oldName != n || d->m_bFromTemplate) {   // true for any from-template file
-            KIO::Job *job = 0L;
+            KIO::Job *job = nullptr;
             QUrl oldurl = properties->url();
 
             QString newFileName = KIO::encodeFileName(n);
@@ -1432,7 +1432,7 @@
     }
 
     // No job, keep going
-    slotCopyFinished(0L);
+    slotCopyFinished(nullptr);
 }
 
 void KFilePropsPlugin::slotCopyFinished(KJob *job)
@@ -1560,7 +1560,7 @@
 
             cfg.reparseConfiguration();
             if (cfg.desktopGroup().readEntry("Icon") != sIcon) {
-                KMessageBox::sorry(0, i18n("<qt>Could not save properties. You do not "
+                KMessageBox::sorry(nullptr, i18n("<qt>Could not save properties. You do not "
                                            "have sufficient access to write to <b>%1</b>.</qt>", path));
             }
         }
@@ -1639,29 +1639,29 @@
         I18N_NOOP("Forbidden"),
         I18N_NOOP("Can Read"),
         I18N_NOOP("Can Read & Write"),
-        0
+        nullptr
     },
     {
         I18N_NOOP("Forbidden"),
         I18N_NOOP("Can View Content"),
         I18N_NOOP("Can View & Modify Content"),
-        0
+        nullptr
     },
-    { 0, 0, 0, 0}, // no texts for links
+    { nullptr, nullptr, nullptr, nullptr}, // no texts for links
     {
         I18N_NOOP("Forbidden"),
         I18N_NOOP("Can View Content & Read"),
         I18N_NOOP("Can View/Read & Modify/Write"),
-        0
+        nullptr
     }
 };
 
 KFilePermissionsPropsPlugin::KFilePermissionsPropsPlugin(KPropertiesDialog *_props)
     : KPropertiesDialogPlugin(_props), d(new KFilePermissionsPropsPluginPrivate)
 {
-    d->cbRecursive = 0L;
-    d->grpCombo = 0L; d->grpEdit = 0;
-    d->usrEdit = 0L;
+    d->cbRecursive = nullptr;
+    d->grpCombo = nullptr; d->grpEdit = nullptr;
+    d->usrEdit = nullptr;
     QString path = properties->url().path();
     QString fname = properties->url().fileName();
     bool isLocal = properties->url().isLocalFile();
@@ -1757,7 +1757,7 @@
     QLabel *lbl;
     QGroupBox *gb;
     QGridLayout *gl;
-    QPushButton *pbAdvancedPerm = 0;
+    QPushButton *pbAdvancedPerm = nullptr;
 
     /* Group: Access Permissions */
     gb = new QGroupBox(i18n("Access Permissions"), d->m_frame);
@@ -1823,7 +1823,7 @@
         gl->addWidget(pbAdvancedPerm, 6, 0, 1, 2, Qt::AlignRight);
         connect(pbAdvancedPerm, SIGNAL(clicked()), this, SLOT(slotShowAdvancedPermissions()));
     } else {
-        d->extraCheckbox = 0;
+        d->extraCheckbox = nullptr;
     }
 
     /**** Group: Ownership ****/
@@ -1942,7 +1942,7 @@
     fileSystemSupportsACLs = (statfs(path.data(), &buf) == 0) && (buf.f_flags & MNT_ACLS);
 #else
     fileSystemSupportsACLs =
-        getxattr(path.data(), "system.posix_acl_access", NULL, 0) >= 0 || errno == ENODATA;
+        getxattr(path.data(), "system.posix_acl_access", nullptr, 0) >= 0 || errno == ENODATA;
 #endif
     return fileSystemSupportsACLs;
 }
@@ -2140,7 +2140,7 @@
     gl->setColumnStretch(6, 10);
 
 #if HAVE_POSIX_ACL
-    KACLEditWidget *extendedACLs = 0;
+    KACLEditWidget *extendedACLs = nullptr;
 
     // FIXME make it work with partial entries
     if (properties->items().count() == 1) {
@@ -3101,7 +3101,7 @@
     QString path = url.toLocalFile();
     QFile f(path);
     if (!f.open(QIODevice::ReadWrite)) {
-        KMessageBox::sorry(0, i18n("<qt>Could not save properties. You do not have "
+        KMessageBox::sorry(nullptr, i18n("<qt>Could not save properties. You do not have "
                                    "sufficient access to write to <b>%1</b>.</qt>", path));
         return;
     }
@@ -3402,7 +3402,7 @@
     const QString path = url.toLocalFile();
     QFile f(path);
     if (!f.open(QIODevice::ReadWrite)) {
-        KMessageBox::sorry(0, i18n("<qt>Could not save properties. You do not have sufficient "
+        KMessageBox::sorry(nullptr, i18n("<qt>Could not save properties. You do not have sufficient "
                                    "access to write to <b>%1</b>.</qt>", path));
         return;
     }
@@ -3668,7 +3668,7 @@
     const QUrl url = job->mostLocalUrl();
 
     if (!url.isLocalFile()) {
-        KMessageBox::sorry(0, i18n("Could not save properties. Only entries on local file systems are supported."));
+        KMessageBox::sorry(nullptr, i18n("Could not save properties. Only entries on local file systems are supported."));
         return;
     }
 
@@ -3676,7 +3676,7 @@
 
     QFile f(path);
     if (!f.open(QIODevice::ReadWrite)) {
-        KMessageBox::sorry(0, i18n("<qt>Could not save properties. You do not have "
+        KMessageBox::sorry(nullptr, i18n("<qt>Could not save properties. You do not have "
                                    "sufficient access to write to <b>%1</b>.</qt>", path));
         return;
     }
Index: src/widgets/krun.cpp
===================================================================
--- src/widgets/krun.cpp
+++ src/widgets/krun.cpp
@@ -503,7 +503,7 @@
 {
     Q_OBJECT
 public:
-    SecureMessageDialog(QWidget *parent) : QDialog(parent), m_textEdit(0)
+    SecureMessageDialog(QWidget *parent) : QDialog(parent), m_textEdit(nullptr)
     {
     }
 
@@ -809,7 +809,7 @@
     }
 
     int i = KToolInvocation::startServiceByDesktopPath(
-                _service.entryPath(), QUrl::toStringList(urls), &error, 0L, &pid, myasn
+                _service.entryPath(), QUrl::toStringList(urls), &error, nullptr, &pid, myasn
             );
 
     if (i != 0) {
@@ -886,7 +886,7 @@
     m_bAutoDelete = true;
     m_bProgressInfo = showProgressInfo;
     m_bFinished = false;
-    m_job = 0L;
+    m_job = nullptr;
     m_strURL = url;
     m_bScanFile = false;
     m_bIsDirectory = false;
@@ -1180,7 +1180,7 @@
 
 void KRun::slotStatResult(KJob *job)
 {
-    d->m_job = 0L;
+    d->m_job = nullptr;
     const int errCode = job->error();
     if (errCode) {
         // ERR_NO_CONTENT is not an error, but an indication no further
@@ -1241,12 +1241,12 @@
         qCWarning(KIO_WIDGETS) << "get() didn't emit a mimetype! Probably a kioslave bug, please check the implementation of" << url().scheme();
     }
     mimeTypeDetermined(mimetype);
-    d->m_job = 0;
+    d->m_job = nullptr;
 }
 
 void KRun::slotScanFinished(KJob *job)
 {
-    d->m_job = 0;
+    d->m_job = nullptr;
     const int errCode = job->error();
     if (errCode) {
         // ERR_NO_CONTENT is not an error, but an indication no further
@@ -1292,7 +1292,7 @@
 
         job->putOnHold();
         KIO::Scheduler::publishSlaveOnHold();
-        d->m_job = 0;
+        d->m_job = nullptr;
     }
 
     Q_ASSERT(!d->m_bFinished);
@@ -1334,7 +1334,7 @@
     if (d->m_job) {
         //qDebug() << this << "m_job=" << d->m_job;
         d->m_job->kill();
-        d->m_job = 0L;
+        d->m_job = nullptr;
     }
 }
 
@@ -1587,7 +1587,7 @@
         // (or with a full path, if m_executable is absolute), and then in the PATH.
         if (!QFile(m_executable).exists() && QStandardPaths::findExecutable(m_executable).isEmpty()) {
             QEventLoopLocker locker;
-            KMessageBox::sorry(0L, i18n("Could not find the program '%1'", m_executable));
+            KMessageBox::sorry(nullptr, i18n("Could not find the program '%1'", m_executable));
         } else {
             //qDebug() << process->readAllStandardError();
         }
Index: src/widgets/ksslcertificatebox.h
===================================================================
--- src/widgets/ksslcertificatebox.h
+++ src/widgets/ksslcertificatebox.h
@@ -38,7 +38,7 @@
         Issuer
     };
 
-    explicit KSslCertificateBox(QWidget *parent = 0);
+    explicit KSslCertificateBox(QWidget *parent = nullptr);
     ~KSslCertificateBox();
 
     void setCertificate(const QSslCertificate &cert, CertificateParty party);
Index: src/widgets/ksslinfodialog.h
===================================================================
--- src/widgets/ksslinfodialog.h
+++ src/widgets/ksslinfodialog.h
@@ -49,7 +49,7 @@
      *
      *  @param parent the parent widget
      */
-    explicit KSslInfoDialog(QWidget *parent = 0);
+    explicit KSslInfoDialog(QWidget *parent = nullptr);
 
     /**
      *  Destroy this dialog
Index: src/widgets/kurifilter.h
===================================================================
--- src/widgets/kurifilter.h
+++ src/widgets/kurifilter.h
@@ -655,7 +655,7 @@
      * @param parent the parent object, or 0 for no parent
      * @param name the name of the plugin, mandatory
      */
-    explicit KUriFilterPlugin(const QString &name, QObject *parent = 0);
+    explicit KUriFilterPlugin(const QString &name, QObject *parent = nullptr);
 
     /**
      * Filters a URI.
Index: src/widgets/kurifilter.cpp
===================================================================
--- src/widgets/kurifilter.cpp
+++ src/widgets/kurifilter.cpp
@@ -474,14 +474,14 @@
 /*************************  KUriFilterPlugin ******************************/
 
 KUriFilterPlugin::KUriFilterPlugin(const QString &name, QObject *parent)
-    : QObject(parent), d(0)
+    : QObject(parent), d(nullptr)
 {
     setObjectName(name);
 }
 
 KCModule *KUriFilterPlugin::configModule(QWidget *, const char *) const
 {
-    return 0;
+    return nullptr;
 }
 
 QString KUriFilterPlugin::configName() const
Index: src/widgets/kurlcombobox.h
===================================================================
--- src/widgets/kurlcombobox.h
+++ src/widgets/kurlcombobox.h
@@ -79,8 +79,8 @@
      * @li Both  Don't mess with anything, just show the url as given.
      * @param parent The parent object of this widget.
      */
-    explicit KUrlComboBox(Mode mode, QWidget *parent = 0);
-    KUrlComboBox(Mode mode, bool rw, QWidget *parent = 0);
+    explicit KUrlComboBox(Mode mode, QWidget *parent = nullptr);
+    KUrlComboBox(Mode mode, bool rw, QWidget *parent = nullptr);
     /**
      * Destructs the combo box.
      */
Index: src/widgets/kurlcombobox.cpp
===================================================================
--- src/widgets/kurlcombobox.cpp
+++ src/widgets/kurlcombobox.cpp
@@ -217,7 +217,7 @@
 
     it = urls.constBegin();
 
-    KUrlComboBoxPrivate::KUrlComboItem *item = 0L;
+    KUrlComboBoxPrivate::KUrlComboItem *item = nullptr;
 
     while (it != urls.constEnd()) {
         if ((*it).isEmpty()) {
Index: src/widgets/kurlcompletion.cpp
===================================================================
--- src/widgets/kurlcompletion.cpp
+++ src/widgets/kurlcompletion.cpp
@@ -115,8 +115,8 @@
     KUrlCompletionPrivate(KUrlCompletion *parent)
         : q(parent),
           url_auto_completion(true),
-          userListThread(0),
-          dirListThread(0)
+          userListThread(nullptr),
+          dirListThread(nullptr)
     {
     }
 
@@ -547,7 +547,7 @@
     replace_env = true;
     last_no_hidden = false;
     last_compl_type = CTNone;
-    list_job = 0L;
+    list_job = nullptr;
     mode = KUrlCompletion::FileCompletion;
 
     // Read settings
@@ -716,19 +716,19 @@
 {
     if (d->list_job) {
         d->list_job->kill();
-        d->list_job = 0L;
+        d->list_job = nullptr;
     }
 
     if (d->dirListThread) {
         d->dirListThread->requestTermination();
         delete d->dirListThread;
-        d->dirListThread = 0;
+        d->dirListThread = nullptr;
     }
 
     if (d->userListThread) {
         d->userListThread->requestTermination();
         delete d->userListThread;
-        d->userListThread = 0;
+        d->userListThread = nullptr;
     }
 }
 
@@ -1159,7 +1159,7 @@
     bool no_hidden)
 {
     assert(list_urls.isEmpty());
-    assert(list_job == 0L);
+    assert(list_job == nullptr);
 
     list_urls = urls;
     list_urls_filter = filter;
@@ -1173,7 +1173,7 @@
     // This will start a new list job as long as there
     // are urls in d->list_urls
     //
-    _k_slotIOFinished(0);
+    _k_slotIOFinished(nullptr);
 }
 
 /*
@@ -1260,7 +1260,7 @@
 
     if (list_urls.isEmpty()) {
 
-        list_job = 0L;
+        list_job = nullptr;
 
         finished(); // will call KCompletion::makeCompletion()
 
@@ -1364,13 +1364,13 @@
     if (userListThread == thread) {
         thread->wait();
         delete thread;
-        userListThread = 0;
+        userListThread = nullptr;
     }
 
     if (dirListThread == thread) {
         thread->wait();
         delete thread;
-        dirListThread = 0;
+        dirListThread = nullptr;
     }
     finished(); // will call KCompletion::makeCompletion()
 }
Index: src/widgets/kurlpixmapprovider.cpp
===================================================================
--- src/widgets/kurlpixmapprovider.cpp
+++ src/widgets/kurlpixmapprovider.cpp
@@ -24,7 +24,7 @@
 #include <pixmaploader.h>
 
 KUrlPixmapProvider::KUrlPixmapProvider()
-    : d(0)
+    : d(nullptr)
 {
 }
 
Index: src/widgets/kurlrequester.h
===================================================================
--- src/widgets/kurlrequester.h
+++ src/widgets/kurlrequester.h
@@ -72,12 +72,12 @@
     /**
      * Constructs a KUrlRequester widget.
      */
-    explicit KUrlRequester(QWidget *parent = 0);
+    explicit KUrlRequester(QWidget *parent = nullptr);
 
     /**
      * Constructs a KUrlRequester widget with the initial URL @p url.
      */
-    explicit KUrlRequester(const QUrl &url, QWidget *parent = 0);
+    explicit KUrlRequester(const QUrl &url, QWidget *parent = nullptr);
 
     /**
      * Special constructor, which creates a KUrlRequester widget with a custom
@@ -346,7 +346,7 @@
     /**
      * Constructs a KUrlRequester widget with a combobox.
      */
-    explicit KUrlComboRequester(QWidget *parent = 0);
+    explicit KUrlComboRequester(QWidget *parent = nullptr);
 
 private:
     class Private;
Index: src/widgets/kurlrequester.cpp
===================================================================
--- src/widgets/kurlrequester.cpp
+++ src/widgets/kurlrequester.cpp
@@ -65,7 +65,7 @@
         QDrag *dragObject() Q_DECL_OVERRIDE
         {
             if (m_button->m_urls.isEmpty()) {
-                return 0;
+                return nullptr;
             }
 
             QDrag *drag = new QDrag(m_button);
@@ -87,8 +87,8 @@
 public:
     KUrlRequesterPrivate(KUrlRequester *parent)
         : m_parent(parent),
-          edit(0),
-          combo(0),
+          edit(nullptr),
+          combo(nullptr),
           fileDialogMode(KFile::File | KFile::ExistingOnly | KFile::LocalOnly)
     {
     }
@@ -290,7 +290,7 @@
 
 void KUrlRequester::KUrlRequesterPrivate::init()
 {
-    myFileDialog = 0L;
+    myFileDialog = nullptr;
     fileDialogModality = Qt::ApplicationModal;
 
     if (!combo && !edit) {
@@ -618,7 +618,7 @@
 }
 
 KUrlComboRequester::KUrlComboRequester(QWidget *parent)
-    : KUrlRequester(new KComboBox(false), parent), d(0)
+    : KUrlRequester(new KComboBox(false), parent), d(nullptr)
 {
 }
 
Index: src/widgets/kurlrequesterdialog.h
===================================================================
--- src/widgets/kurlrequesterdialog.h
+++ src/widgets/kurlrequesterdialog.h
@@ -48,7 +48,7 @@
      *               directory where a file has been selected.
      * @param parent The parent object of this widget.
      */
-    explicit KUrlRequesterDialog(const QUrl &url, QWidget *parent = 0);
+    explicit KUrlRequesterDialog(const QUrl &url, QWidget *parent = nullptr);
 
     /**
      * Constructs a KUrlRequesterDialog.
@@ -79,7 +79,7 @@
      * @param caption The caption to use for the dialog.
      */
     static QUrl getUrl(const QUrl &url = QUrl(),
-                       QWidget *parent = 0, const QString &caption = QString());
+                       QWidget *parent = nullptr, const QString &caption = QString());
 
     /**
      * Returns a pointer to the file dialog used by the KUrlRequester.
Index: src/widgets/paste.cpp
===================================================================
--- src/widgets/paste.cpp
+++ src/widgets/paste.cpp
@@ -61,7 +61,7 @@
     const QList<QUrl> urls = KUrlMimeData::urlsFromMimeData(mimeData, KUrlMimeData::PreferLocalUrls);
     if (!urls.isEmpty()) {
         const bool move = KIO::isClipboardDataCut(mimeData);
-        KIO::Job *job = 0;
+        KIO::Job *job = nullptr;
         if (move) {
             job = KIO::move(urls, destDir, flags);
         } else {
@@ -69,7 +69,7 @@
         }
         return job;
     }
-    return 0;
+    return nullptr;
 }
 
 static QUrl getNewFileName(const QUrl &u, const QString &text, const QString &suggestedFileName, QWidget *widget)
@@ -227,24 +227,24 @@
     } else {
         const QStringList formats = extractFormats(mimeData);
         if (formats.isEmpty()) {
-            return 0;
+            return nullptr;
         } else if (formats.size() > 1) {
             QUrl newUrl;
             ba = chooseFormatAndUrl(destUrl, mimeData, formats, dialogText, suggestedFilename, widget, clipboard, &newUrl);
             if (ba.isEmpty()) {
-                return 0;
+                return nullptr;
             }
             return putDataAsyncTo(newUrl, ba, widget, KIO::Overwrite);
         }
         ba = mimeData->data(formats.first());
     }
     if (ba.isEmpty()) {
-        return 0;
+        return nullptr;
     }
 
     const QUrl newUrl = getNewFileName(destUrl, dialogText, suggestedFilename, widget);
     if (newUrl.isEmpty()) {
-        return 0;
+        return nullptr;
     }
 
     return putDataAsyncTo(newUrl, ba, widget, KIO::Overwrite);
@@ -258,7 +258,7 @@
     if (!destUrl.isValid()) {
         KMessageBox::error(widget, i18n("Malformed URL\n%1", destUrl.errorString()));
         qCWarning(KIO_WIDGETS) << destUrl.errorString();
-        return 0;
+        return nullptr;
     }
 
     // TODO: if we passed mimeData as argument, we could write unittests that don't
Index: src/widgets/pastejob.cpp
===================================================================
--- src/widgets/pastejob.cpp
+++ src/widgets/pastejob.cpp
@@ -53,7 +53,7 @@
 {
     Q_Q(PasteJob);
     const bool move = KIO::isClipboardDataCut(m_mimeData);
-    KIO::Job *job = 0;
+    KIO::Job *job = nullptr;
     if (m_mimeData->hasUrls()) {
         const QList<QUrl> urls = KUrlMimeData::urlsFromMimeData(m_mimeData, KUrlMimeData::PreferLocalUrls);
         if (!urls.isEmpty()) {
Index: src/widgets/pixmaploader.h
===================================================================
--- src/widgets/pixmaploader.h
+++ src/widgets/pixmaploader.h
@@ -45,7 +45,7 @@
  * @return the pixmap of the URL, can be a default icon if not found
  */
 KIOWIDGETS_EXPORT QPixmap pixmapForUrl(const QUrl &url, int dummy = 0, KIconLoader::Group group = KIconLoader::Desktop,
-                                       int force_size = 0, int state = 0, QString *path = 0);
+                                       int force_size = 0, int state = 0, QString *path = nullptr);
 
 }
 
Index: src/widgets/previewjob.h
===================================================================
--- src/widgets/previewjob.h
+++ src/widgets/previewjob.h
@@ -100,7 +100,7 @@
      */
     PreviewJob(const KFileItemList &items,
                const QSize &size,
-               const QStringList *enabledPlugins = 0);
+               const QStringList *enabledPlugins = nullptr);
 
     virtual ~PreviewJob();
 
@@ -258,7 +258,7 @@
  *             with the setter-methods instead. Note that the semantics of
  *             \p enabledPlugins has been slightly changed.
  */
-KIOWIDGETS_DEPRECATED_EXPORT PreviewJob *filePreview(const KFileItemList &items, int width, int height = 0, int iconSize = 0, int iconAlpha = 70, bool scale = true, bool save = true, const QStringList *enabledPlugins = 0);   // KDE5: use enums instead of bool scale + bool save
+KIOWIDGETS_DEPRECATED_EXPORT PreviewJob *filePreview(const KFileItemList &items, int width, int height = 0, int iconSize = 0, int iconAlpha = 70, bool scale = true, bool save = true, const QStringList *enabledPlugins = nullptr);   // KDE5: use enums instead of bool scale + bool save
 
 /**
  * Creates a PreviewJob to generate or retrieve a preview image
@@ -283,7 +283,7 @@
  *             with the setter-methods instead. Note that the semantics of
  *             \p enabledPlugins has been slightly changed.
  */
-KIOWIDGETS_DEPRECATED_EXPORT PreviewJob *filePreview(const QList<QUrl> &items, int width, int height = 0, int iconSize = 0, int iconAlpha = 70, bool scale = true, bool save = true, const QStringList *enabledPlugins = 0);
+KIOWIDGETS_DEPRECATED_EXPORT PreviewJob *filePreview(const QList<QUrl> &items, int width, int height = 0, int iconSize = 0, int iconAlpha = 70, bool scale = true, bool save = true, const QStringList *enabledPlugins = nullptr);
 #endif
 
 /**
@@ -296,7 +296,7 @@
  *                       KConfigGroup "PreviewSettings" are used.
  * @since 4.7
  */
-KIOWIDGETS_EXPORT PreviewJob *filePreview(const KFileItemList &items, const QSize &size, const QStringList *enabledPlugins = 0);
+KIOWIDGETS_EXPORT PreviewJob *filePreview(const KFileItemList &items, const QSize &size, const QStringList *enabledPlugins = nullptr);
 }
 
 #endif
Index: src/widgets/previewjob.cpp
===================================================================
--- src/widgets/previewjob.cpp
+++ src/widgets/previewjob.cpp
@@ -80,7 +80,7 @@
           iconSize(0),
           iconAlpha(70),
           shmid(-1),
-          shmaddr(0)
+          shmaddr(nullptr)
     {
         // http://specifications.freedesktop.org/thumbnail-spec/thumbnail-spec-latest.html#DIRECTORY
         thumbRoot = QStandardPaths::writableLocation(QStandardPaths::GenericCacheLocation) + QLatin1String("/thumbnails/");
@@ -195,7 +195,7 @@
     Q_D(PreviewJob);
     if (d->shmaddr) {
         shmdt((char *)d->shmaddr);
-        shmctl(d->shmid, IPC_RMID, 0);
+        shmctl(d->shmid, IPC_RMID, nullptr);
     }
 #endif
 }
@@ -299,7 +299,7 @@
         PreviewItem item;
         item.item = *kit;
         const QString mimeType = item.item.mimetype();
-        KService::Ptr plugin(0);
+        KService::Ptr plugin(nullptr);
 
         // look for protocol-specific thumbnail plugins first
         QHash<QString, QHash<QString, KService::Ptr> >::const_iterator it = protocolMap.constFind(item.item.url().scheme());
@@ -627,18 +627,18 @@
     if (shmid == -1) {
         if (shmaddr) {
             shmdt((char *)shmaddr);
-            shmctl(shmid, IPC_RMID, 0);
+            shmctl(shmid, IPC_RMID, nullptr);
         }
         shmid = shmget(IPC_PRIVATE, cacheWidth * cacheHeight * 4, IPC_CREAT | 0600);
         if (shmid != -1) {
-            shmaddr = (uchar *)(shmat(shmid, 0, SHM_RDONLY));
+            shmaddr = (uchar *)(shmat(shmid, nullptr, SHM_RDONLY));
             if (shmaddr == (uchar *) - 1) {
-                shmctl(shmid, IPC_RMID, 0);
-                shmaddr = 0;
+                shmctl(shmid, IPC_RMID, nullptr);
+                shmaddr = nullptr;
                 shmid = -1;
             }
         } else {
-            shmaddr = 0;
+            shmaddr = nullptr;
         }
     }
     if (shmid != -1) {
Index: src/widgets/renamedialog.cpp
===================================================================
--- src/widgets/renamedialog.cpp
+++ src/widgets/renamedialog.cpp
@@ -97,15 +97,15 @@
 public:
     RenameDialogPrivate()
     {
-        bCancel = 0;
-        bRename = bSkip = bOverwrite = 0;
-        bResume = bSuggestNewName = 0;
-        bApplyAll = 0;
-        m_pLineEdit = 0;
+        bCancel = nullptr;
+        bRename = bSkip = bOverwrite = nullptr;
+        bResume = bSuggestNewName = nullptr;
+        bApplyAll = nullptr;
+        m_pLineEdit = nullptr;
         m_srcPendingPreview = false;
         m_destPendingPreview = false;
-        m_srcPreview = 0;
-        m_destPreview = 0;
+        m_srcPreview = nullptr;
+        m_destPreview = nullptr;
         m_srcArea = Q_NULLPTR;
         m_destArea = Q_NULLPTR;
     }
Index: src/widgets/skipdialog.cpp
===================================================================
--- src/widgets/skipdialog.cpp
+++ src/widgets/skipdialog.cpp
@@ -33,7 +33,7 @@
 using namespace KIO;
 
 SkipDialog::SkipDialog(QWidget *parent, KIO::SkipDialog_Options options, const QString &_error_text)
-    : QDialog(parent), d(0)
+    : QDialog(parent), d(nullptr)
 {
     setWindowTitle(i18n("Information"));
 
Index: src/widgets/sslui.cpp
===================================================================
--- src/widgets/sslui.cpp
+++ src/widgets/sslui.cpp
@@ -46,7 +46,7 @@
     }
     if (ud->certificateChain.isEmpty()) {
         // SSL without certificates is quite useless and should never happen
-        KMessageBox::sorry(0, i18n("The remote host did not send any SSL certificates.\n"
+        KMessageBox::sorry(nullptr, i18n("The remote host did not send any SSL certificates.\n"
                                    "Aborting because the identity of the host cannot be established."));
         return false;
     }
@@ -74,7 +74,7 @@
 
     int msgResult;
     do {
-        msgResult = KMessageBox::warningYesNoCancel(0, message, i18n("Server Authentication"),
+        msgResult = KMessageBox::warningYesNoCancel(nullptr, message, i18n("Server Authentication"),
                     KGuiItem(i18n("&Details"), QStringLiteral("help-about")),
                     KGuiItem(i18n("Co&ntinue"), QStringLiteral("arrow-right")));
         if (msgResult == KMessageBox::Yes) {
@@ -106,7 +106,7 @@
     if (storedRules & StoreRules) {
         //Save the user's choice to ignore the SSL errors.
 
-        msgResult = KMessageBox::warningYesNo(0,
+        msgResult = KMessageBox::warningYesNo(nullptr,
                                               i18n("Would you like to accept this "
                                                       "certificate forever without "
                                                       "being prompted?"),
Index: src/widgets/thumbcreator.cpp
===================================================================
--- src/widgets/thumbcreator.cpp
+++ src/widgets/thumbcreator.cpp
@@ -36,7 +36,7 @@
 
 QWidget *ThumbCreator::createConfigurationWidget()
 {
-    return 0;
+    return nullptr;
 }
 
 void ThumbCreator::writeConfiguration(const QWidget *configurationWidget)
Index: tests/kdirlistertest_gui.h
===================================================================
--- tests/kdirlistertest_gui.h
+++ tests/kdirlistertest_gui.h
@@ -124,7 +124,7 @@
 {
     Q_OBJECT
 public:
-    KDirListerTest(QWidget *parent = 0);
+    KDirListerTest(QWidget *parent = nullptr);
     ~KDirListerTest();
 
 public Q_SLOTS:
Index: tests/kdirlistertest_gui.cpp
===================================================================
--- tests/kdirlistertest_gui.cpp
+++ tests/kdirlistertest_gui.cpp
@@ -157,7 +157,7 @@
     QApplication::setApplicationName(QStringLiteral("kdirlistertest"));
     QApplication app(argc, argv);
 
-    KDirListerTest *test = new KDirListerTest(0);
+    KDirListerTest *test = new KDirListerTest(nullptr);
     test->show();
     return app.exec();
 }
Index: tests/kdirmodeltest_gui.cpp
===================================================================
--- tests/kdirmodeltest_gui.cpp
+++ tests/kdirmodeltest_gui.cpp
@@ -60,11 +60,11 @@
 
     QApplication a(argc, argv);
 
-    KDirModel *dirmodel = new KDirModel(0);
+    KDirModel *dirmodel = new KDirModel(nullptr);
     dirmodel->dirLister()->setDelayedMimeTypes(true);
 
 #if 1
-    QTreeView *treeView = new QTreeView(0);
+    QTreeView *treeView = new QTreeView(nullptr);
     treeView->setModel(dirmodel);
     treeView->setUniformRowHeights(true); // makes visualRect() much faster
     treeView->resize(500, 500);
@@ -81,7 +81,7 @@
 #endif
 
 #if 1
-    QListView *iconView = new QListView(0);
+    QListView *iconView = new QListView(nullptr);
     iconView->setModel(dirmodel);
     iconView->setSelectionMode(QListView::ExtendedSelection);
     iconView->setViewMode(QListView::IconMode);
Index: tests/kioslavetest.cpp
===================================================================
--- tests/kioslavetest.cpp
+++ tests/kioslavetest.cpp
@@ -36,10 +36,10 @@
 using namespace KIO;
 
 KioslaveTest::KioslaveTest(QString src, QString dest, uint op, uint pr)
-    : KMainWindow(0)
+    : KMainWindow(nullptr)
 {
 
-    job = 0L;
+    job = nullptr;
 
     main_widget = new QWidget(this);
     QBoxLayout *topLayout = new QVBoxLayout(main_widget);
@@ -172,7 +172,7 @@
     main_widget->setMinimumSize(main_widget->sizeHint());
     setCentralWidget(main_widget);
 
-    slave = 0;
+    slave = nullptr;
 //  slave = KIO::Scheduler::getConnectedSlave(QUrl("ftp://ftp.kde.org"));
     KIO::Scheduler::connect(SIGNAL(slaveConnected(KIO::Slave*)),
                             this, SLOT(slotSlaveConnected()));
@@ -234,7 +234,7 @@
         observe = HideProgressInfo;
     }
 
-    SimpleJob *myJob = 0;
+    SimpleJob *myJob = nullptr;
 
     switch (selectedOperation) {
     case List:
@@ -323,7 +323,7 @@
     }
 
     if (job == _job) {
-        job = 0L;
+        job = nullptr;
     }
 
     pbStart->setEnabled(true);
@@ -340,7 +340,7 @@
 void KioslaveTest::slotSlaveError()
 {
     qDebug() << "Error connected.";
-    slave = 0;
+    slave = nullptr;
 }
 
 void KioslaveTest::printUDSEntry(const KIO::UDSEntry &entry)
@@ -439,7 +439,7 @@
         "BIG3\n",
         "BIG4\n",
         "BIG5\n",
-        0
+        nullptr
     };
     const char *fileData = fileDataArray[putBuffer++];
 
@@ -460,7 +460,7 @@
 {
     qDebug() << "KioslaveTest::stopJob()";
     job->kill();
-    job = 0L;
+    job = nullptr;
 
     pbStop->setEnabled(false);
     pbStart->setEnabled(true);
Index: tests/kopenwithtest.cpp
===================================================================
--- tests/kopenwithtest.cpp
+++ tests/kopenwithtest.cpp
@@ -45,7 +45,7 @@
 
     // Test with two URLs
     list += QUrl(QStringLiteral("http://www.kde.org/index.html"));
-    dlg = new KOpenWithDialog(list, QString(), QString(), 0);
+    dlg = new KOpenWithDialog(list, QString(), QString(), nullptr);
     if (dlg->exec()) {
         qDebug() << "Dialog ended successfully\ntext: " << dlg->text();
     } else {
@@ -55,7 +55,7 @@
 
     // Test with a mimetype
     QString mimetype = QStringLiteral("text/plain");
-    dlg = new KOpenWithDialog(mimetype, QStringLiteral("kedit"), 0);
+    dlg = new KOpenWithDialog(mimetype, QStringLiteral("kedit"), nullptr);
     if (dlg->exec()) {
         qDebug() << "Dialog ended successfully\ntext: " << dlg->text();
     } else {
Index: tests/kruntest.cpp
===================================================================
--- tests/kruntest.cpp
+++ tests/kruntest.cpp
@@ -48,13 +48,13 @@
     const char *exec;
     const char *url;
 } s_tests[] = {
-    { "run(kwrite, no url)", "should work normally", "kwrite", 0 },
+    { "run(kwrite, no url)", "should work normally", "kwrite", nullptr },
     { "run(kwrite, file url)", "should work normally", "kwrite", testFile },
     { "run(kwrite, remote url)", "should work normally", "kwrite", "http://www.kde.org" },
-    { "run(doesnotexit, no url)", "should show error message", "doesnotexist", 0 },
+    { "run(doesnotexit, no url)", "should show error message", "doesnotexist", nullptr },
     { "run(doesnotexit, file url)", "should show error message", "doesnotexist", testFile },
     { "run(doesnotexit, remote url)", "should use kioexec and show error message", "doesnotexist", "http://www.kde.org" },
-    { "run(missing lib, no url)", "should show error message (remove libqca.so.2 for this, e.g. by editing LD_LIBRARY_PATH if qca is in its own prefix)", "qcatool", 0 },
+    { "run(missing lib, no url)", "should show error message (remove libqca.so.2 for this, e.g. by editing LD_LIBRARY_PATH if qca is in its own prefix)", "qcatool", nullptr },
     { "run(missing lib, file url)", "should show error message (remove libqca.so.2 for this, e.g. by editing LD_LIBRARY_PATH if qca is in its own prefix)", "qcatool", testFile },
     { "run(missing lib, remote url)", "should show error message (remove libqca.so.2 for this, e.g. by editing LD_LIBRARY_PATH if qca is in its own prefix)", "qcatool", "http://www.kde.org" },
     { "runCommand(empty)", "should error", "", "" }, // #186036
Index: tests/ksycocaupdatetest.cpp
===================================================================
--- tests/ksycocaupdatetest.cpp
+++ tests/ksycocaupdatetest.cpp
@@ -7,6 +7,6 @@
     QApplication::setApplicationName(QStringLiteral("whatever"));
     QApplication k(argc, argv);
 
-    KBuildSycocaProgressDialog::rebuildKSycoca(0);
+    KBuildSycocaProgressDialog::rebuildKSycoca(nullptr);
     return 0;
 }
Index: tests/kurlnavigatortest_gui.cpp
===================================================================
--- tests/kurlnavigatortest_gui.cpp
+++ tests/kurlnavigatortest_gui.cpp
@@ -31,7 +31,7 @@
     QApplication::setAttribute(Qt::AA_UseHighDpiPixmaps, true);
     QApplication app(argc, argv);
 
-    KUrlNavigator urlNavigator(new KFilePlacesModel, QUrl::fromLocalFile(QDir::homePath()), 0);
+    KUrlNavigator urlNavigator(new KFilePlacesModel, QUrl::fromLocalFile(QDir::homePath()), nullptr);
     urlNavigator.show();
 
     return app.exec();
Index: tests/listjobtest.cpp
===================================================================
--- tests/listjobtest.cpp
+++ tests/listjobtest.cpp
@@ -61,7 +61,7 @@
     timer.start();
 
     KIO::ListJob *job = KIO::listDir(url, KIO::HideProgressInfo);
-    job->setUiDelegate(0);
+    job->setUiDelegate(nullptr);
     job->addMetaData(QStringLiteral("details"), QStringLiteral("2")); // Default is 2 which means all details. 0 means just a few essential fields (KIO::UDSEntry::UDS_NAME, KIO::UDSEntry::UDS_FILE_TYPE and KIO::UDSEntry::UDS_LINK_DEST if it is a symbolic link. Not provided otherwise.
 
     QObject::connect(job, SIGNAL(entries(KIO::Job*,KIO::UDSEntryList)), &testObject, SLOT(slotEntries(KIO::Job*,KIO::UDSEntryList)));
Index: tests/listrecursivetest.cpp
===================================================================
--- tests/listrecursivetest.cpp
+++ tests/listrecursivetest.cpp
@@ -47,7 +47,7 @@
 using namespace KIO;
 
 SpeedTest::SpeedTest(const QUrl &url)
-    : QObject(0)
+    : QObject(nullptr)
 {
     Job *job = listRecursive(url);
     connect(job, SIGNAL(result(KJob*)),