diff --git a/app/main.cpp b/app/main.cpp
--- a/app/main.cpp
+++ b/app/main.cpp
@@ -179,7 +179,7 @@
     // We won't search a session without input data, since that could lead to false-positives
     // with unnamed sessions
     if( data.isEmpty() )
-        return 0;
+        return nullptr;
 
     for( auto it = sessions.constBegin(); it != sessions.constEnd(); ++it ) {
         if ( ( it->name == data ) || ( it->uuid.toString() == data ) ) {
@@ -187,7 +187,7 @@
             return &sessionRef;
         }
     }
-    return 0;
+    return nullptr;
 }
 
 /// Performs a DBus call to open the given @p files in the running kdev instance identified by @p pid
@@ -686,7 +686,7 @@
         Q_ASSERT( !debugeeName.isEmpty() );
         QString launchName = debugeeName;
 
-        KDevelop::LaunchConfiguration* launch = 0;
+        KDevelop::LaunchConfiguration* launch = nullptr;
         qCDebug(APP) << launchName;
         foreach (KDevelop::LaunchConfiguration *l, core->runControllerInternal()->launchConfigurationsInternal()) {
             qCDebug(APP) << l->name();
@@ -695,7 +695,7 @@
             }
         }
 
-        KDevelop::LaunchConfigurationType *type = 0;
+        KDevelop::LaunchConfigurationType *type = nullptr;
         foreach (KDevelop::LaunchConfigurationType *t, core->runController()->launchConfigurationTypes()) {
             qCDebug(APP) << t->id();
             if (t->id() == "Native Application") {
@@ -709,8 +709,8 @@
             return 1;
         }
 
-        if (launch && launch->type()->id() != "Native Application") launch = 0;
-        if (launch && launch->launcherForMode("debug") != parser.value("debug")) launch = 0;
+        if (launch && launch->type()->id() != "Native Application") launch = nullptr;
+        if (launch && launch->launcherForMode("debug") != parser.value("debug")) launch = nullptr;
         if (!launch) {
             qCDebug(APP) << launchName << "not found, creating a new one";
             QPair<QString,QString> launcher;
@@ -727,7 +727,7 @@
                 qerr << endl << i18n("Cannot find launcher %1", parser.value("debug")) << endl;
                 return 1;
             }
-            KDevelop::ILaunchConfiguration* ilaunch = core->runController()->createLaunchConfiguration(type, launcher, 0, launchName);
+            KDevelop::ILaunchConfiguration* ilaunch = core->runController()->createLaunchConfiguration(type, launcher, nullptr, launchName);
             launch = dynamic_cast<KDevelop::LaunchConfiguration*>(ilaunch);
         }
 
diff --git a/app/plasma/dataengine/kdevelopsessionsengine.cpp b/app/plasma/dataengine/kdevelopsessionsengine.cpp
--- a/app/plasma/dataengine/kdevelopsessionsengine.cpp
+++ b/app/plasma/dataengine/kdevelopsessionsengine.cpp
@@ -30,7 +30,7 @@
 
 KDevelopSessionsEngine::KDevelopSessionsEngine(QObject *parent, const QVariantList &args)
     : Plasma::DataEngine(parent, args),
-      m_dirWatch(0)
+      m_dirWatch(nullptr)
 {
     init();
 }
diff --git a/debuggers/common/dialogs/processselection.h b/debuggers/common/dialogs/processselection.h
--- a/debuggers/common/dialogs/processselection.h
+++ b/debuggers/common/dialogs/processselection.h
@@ -32,7 +32,7 @@
 {
     Q_OBJECT
     public:
-        ProcessSelectionDialog( QWidget *parent=0 );
+        ProcessSelectionDialog( QWidget *parent=nullptr );
         ~ProcessSelectionDialog() override;
         long int pidSelected();
         QSize sizeHint() const override;
diff --git a/debuggers/common/mi/micommand.cpp b/debuggers/common/mi/micommand.cpp
--- a/debuggers/common/mi/micommand.cpp
+++ b/debuggers/common/mi/micommand.cpp
@@ -112,7 +112,7 @@
         if (autoDelete) {
             delete commandHandler_;
         }
-        commandHandler_ = 0;
+        commandHandler_ = nullptr;
         return true;
     } else {
         return false;
diff --git a/debuggers/common/mi/miparser.cpp b/debuggers/common/mi/miparser.cpp
--- a/debuggers/common/mi/miparser.cpp
+++ b/debuggers/common/mi/miparser.cpp
@@ -49,7 +49,7 @@
   } while (0)
 
 MIParser::MIParser()
-    : m_lex(0)
+    : m_lex(nullptr)
 {
 }
 
@@ -59,11 +59,11 @@
 
 std::unique_ptr<Record> MIParser::parse(FileSymbol *file)
 {
-    m_lex = 0;
+    m_lex = nullptr;
 
     TokenStream *tokenStream = m_lexer.tokenize(file);
     if (!tokenStream)
-        return 0;
+        return nullptr;
 
     m_lex = file->tokenStream = tokenStream;
 
@@ -192,7 +192,7 @@
         m_lex->nextToken();
     }
 
-    Value *value = 0;
+    Value *value = nullptr;
     if (!parseValue(value))
         return false;
 
@@ -204,7 +204,7 @@
 
 bool MIParser::parseValue(Value *&value)
 {
-    value = 0;
+    value = nullptr;
 
     switch (m_lex->lookAhead()) {
         case Token_string_literal: {
@@ -247,8 +247,8 @@
     // that out too using function pointers.
     int tok = m_lex->lookAhead();
     while (tok && tok != ']') {
-        Result *result = 0;
-        Value *val = 0;
+        Result *result = nullptr;
+        Value *val = nullptr;
 
         if (tok == Token_identifier)
         {
diff --git a/debuggers/common/mibreakpointcontroller.cpp b/debuggers/common/mibreakpointcontroller.cpp
--- a/debuggers/common/mibreakpointcontroller.cpp
+++ b/debuggers/common/mibreakpointcontroller.cpp
@@ -158,7 +158,7 @@
 
 struct MIBreakpointController::DeleteHandler : MIBreakpointController::Handler {
     DeleteHandler(MIBreakpointController* c, const BreakpointDataPtr& b)
-        : Handler(c, b, 0) {}
+        : Handler(c, b, nullptr) {}
 
     void handle(const ResultRecord&) override
     {
diff --git a/debuggers/common/midebugger.h b/debuggers/common/midebugger.h
--- a/debuggers/common/midebugger.h
+++ b/debuggers/common/midebugger.h
@@ -45,7 +45,7 @@
 {
     Q_OBJECT
 public:
-    explicit MIDebugger(QObject* parent = 0);
+    explicit MIDebugger(QObject* parent = nullptr);
     ~MIDebugger() override;
 
     /** Starts the debugger.  This should be done after connecting to all
diff --git a/debuggers/common/midebugger.cpp b/debuggers/common/midebugger.cpp
--- a/debuggers/common/midebugger.cpp
+++ b/debuggers/common/midebugger.cpp
@@ -95,7 +95,7 @@
 
 bool MIDebugger::isReady() const
 {
-    return currentCmd_ == 0;
+    return currentCmd_ == nullptr;
 }
 
 void MIDebugger::interrupt()
diff --git a/debuggers/common/midebuggerplugin.h b/debuggers/common/midebuggerplugin.h
--- a/debuggers/common/midebuggerplugin.h
+++ b/debuggers/common/midebuggerplugin.h
@@ -124,7 +124,7 @@
     : m_plugin(plugin), m_id(id), m_defaultArea(defaultArea)
     {}
 
-    QWidget* create(QWidget *parent = 0) override
+    QWidget* create(QWidget *parent = nullptr) override
     {
         return new T(m_plugin, parent);
     }
diff --git a/debuggers/common/midebugjobs.h b/debuggers/common/midebugjobs.h
--- a/debuggers/common/midebugjobs.h
+++ b/debuggers/common/midebugjobs.h
@@ -43,7 +43,7 @@
     Q_OBJECT
 public:
     MIDebugJob(MIDebuggerPlugin* p, KDevelop::ILaunchConfiguration* launchcfg, IExecutePlugin* plugin,
-             QObject* parent = 0);
+             QObject* parent = nullptr);
     void start() override;
 
 protected:
diff --git a/debuggers/common/midebugsession.h b/debuggers/common/midebugsession.h
--- a/debuggers/common/midebugsession.h
+++ b/debuggers/common/midebugsession.h
@@ -188,7 +188,7 @@
 
 public:
     virtual MI::MICommand *createCommand(MI::CommandType type, const QString& arguments,
-                                         MI::CommandFlags flags = 0) const;
+                                         MI::CommandFlags flags = nullptr) const;
     virtual MI::MICommand *createUserCommand(const QString &cmd) const;
     /** Adds a command to the end of queue of commands to be executed
         by debugger. The command will be actually sent to debugger only when
@@ -205,21 +205,21 @@
 
     /** Same as above, but internally constructs MICommand using createCommand() */
     void addCommand(MI::CommandType type, const QString& arguments = QString(),
-                    MI::CommandFlags flags = 0);
+                    MI::CommandFlags flags = nullptr);
 
     void addCommand(MI::CommandType type, const QString& arguments,
                     MI::MICommandHandler* handler,
-                    MI::CommandFlags flags = 0);
+                    MI::CommandFlags flags = nullptr);
 
     void addCommand(MI::CommandType type, const QString& arguments,
                     const MI::FunctionCommandHandler::Function& callback,
-                    MI::CommandFlags flags = 0);
+                    MI::CommandFlags flags = nullptr);
 
     template<class Handler>
     void addCommand(MI::CommandType type, const QString& arguments,
                     Handler* handler_this,
                     void (Handler::* handler_method)(const MI::ResultRecord&),
-                    MI::CommandFlags flags = 0);
+                    MI::CommandFlags flags = nullptr);
 
     QMap<QString, MIVariable*> & variableMapping();
     MIVariable* findVariableByVarobjName(const QString &varobjName) const;
diff --git a/debuggers/common/midebugsession.cpp b/debuggers/common/midebugsession.cpp
--- a/debuggers/common/midebugsession.cpp
+++ b/debuggers/common/midebugsession.cpp
@@ -1252,7 +1252,7 @@
         // will continiously bomd STTY with signals, so we need to either disable
         // QSocketNotifier, or delete STTY. The latter is simpler, since we can't
         // reuse it for future debug sessions anyway.
-        m_tty.reset(0);
+        m_tty.reset(nullptr);
     }
 
     stopDebugger();
diff --git a/debuggers/common/registers/modelsmanager.h b/debuggers/common/registers/modelsmanager.h
--- a/debuggers/common/registers/modelsmanager.h
+++ b/debuggers/common/registers/modelsmanager.h
@@ -47,7 +47,7 @@
     Q_OBJECT
 
 public:
-    explicit ModelsManager(QObject* parent = 0);
+    explicit ModelsManager(QObject* parent = nullptr);
 
     ~ModelsManager() override;
 
diff --git a/debuggers/common/registers/modelsmanager.cpp b/debuggers/common/registers/modelsmanager.cpp
--- a/debuggers/common/registers/modelsmanager.cpp
+++ b/debuggers/common/registers/modelsmanager.cpp
@@ -65,7 +65,7 @@
 
 using namespace KDevMI;
 
-ModelsManager::ModelsManager(QObject* parent) : QObject(parent), m_models(new Models), m_controller(0), m_config(KSharedConfig::openConfig()->group("Register models")) {}
+ModelsManager::ModelsManager(QObject* parent) : QObject(parent), m_models(new Models), m_controller(nullptr), m_config(KSharedConfig::openConfig()->group("Register models")) {}
 
 ModelsManager::~ModelsManager() {}
 
@@ -166,7 +166,7 @@
         m_models.append(m);
         return m.model.data();
     }
-    return 0;
+    return nullptr;
 }
 
 bool Models::contains(const QString& name) const
@@ -206,7 +206,7 @@
             return m.model.data();
         }
     }
-    return 0;
+    return nullptr;
 }
 
 QStandardItemModel* Models::modelForView(QAbstractItemView* view) const
@@ -216,7 +216,7 @@
             return m.model.data();
         }
     }
-    return 0;
+    return nullptr;
 }
 
 void ModelsManager::itemChanged(QStandardItem* i)
diff --git a/debuggers/common/registers/registercontroller.h b/debuggers/common/registers/registercontroller.h
--- a/debuggers/common/registers/registercontroller.h
+++ b/debuggers/common/registers/registercontroller.h
@@ -157,7 +157,7 @@
     virtual void setRegisterValue(const Register& reg);
 
 protected:
-    IRegisterController(MIDebugSession* debugSession = 0, QObject* parent = 0);
+    IRegisterController(MIDebugSession* debugSession = nullptr, QObject* parent = nullptr);
 
     ///Returns registers from the @p group, or empty registers group if @p group is invalid.
     virtual RegistersGroup registersFromGroup(const GroupsName& group) const = 0;
diff --git a/debuggers/common/registers/registercontroller.cpp b/debuggers/common/registers/registercontroller.cpp
--- a/debuggers/common/registers/registercontroller.cpp
+++ b/debuggers/common/registers/registercontroller.cpp
@@ -218,7 +218,7 @@
 
 void IRegisterController::setFlagRegister(const Register& reg, const FlagRegister& flag)
 {
-    quint32 flagsValue = registerValue(flag.registerName).toUInt(0, 16);
+    quint32 flagsValue = registerValue(flag.registerName).toUInt(nullptr, 16);
 
     const int idx = flag.flags.indexOf(reg.name);
 
@@ -251,7 +251,7 @@
 
 void IRegisterController::updateFlagValues(RegistersGroup* flagsGroup, const FlagRegister& flagRegister) const
 {
-    const quint32 flagsValue = registerValue(flagRegister.registerName).toUInt(0, 16);
+    const quint32 flagsValue = registerValue(flagRegister.registerName).toUInt(nullptr, 16);
 
     for (int idx = 0; idx < flagRegister.flags.count(); idx++) {
         flagsGroup->registers[idx].value = ((flagsValue >> flagRegister.bits[idx].toInt()) & 1) ? "1" : "0";
diff --git a/debuggers/common/registers/registersmanager.cpp b/debuggers/common/registers/registersmanager.cpp
--- a/debuggers/common/registers/registersmanager.cpp
+++ b/debuggers/common/registers/registersmanager.cpp
@@ -78,12 +78,12 @@
 }
 
 RegistersManager::RegistersManager(QWidget* parent)
-: QObject(parent), m_registersView(new RegistersView(parent)), m_registerController(0), m_architectureParser(new ArchitectureParser(this)), m_debugSession(0), m_modelsManager(new ModelsManager(this)), m_currentArchitecture(undefined), m_needToCheckArch(false)
+: QObject(parent), m_registersView(new RegistersView(parent)), m_registerController(nullptr), m_architectureParser(new ArchitectureParser(this)), m_debugSession(nullptr), m_modelsManager(new ModelsManager(this)), m_currentArchitecture(undefined), m_needToCheckArch(false)
 {
     connect(m_architectureParser, &ArchitectureParser::architectureParsed, this, &RegistersManager::architectureParsedSlot);
 
     m_registersView->setModel(m_modelsManager);
-    setController(0);
+    setController(nullptr);
 }
 
 void RegistersManager::architectureParsedSlot(Architecture arch)
@@ -132,7 +132,7 @@
     if (!m_debugSession) {
         qCDebug(DEBUGGERCOMMON) << "Will reparse arch";
         m_needToCheckArch = true;
-        setController(0);
+        setController(nullptr);
     }
 }
 
@@ -146,7 +146,7 @@
     if (m_needToCheckArch) {
         m_needToCheckArch = false;
         m_currentArchitecture = undefined;
-        setController(0);
+        setController(nullptr);
     }
     if (m_currentArchitecture == undefined) {
         m_architectureParser->determineArchitecture(m_debugSession);
diff --git a/debuggers/common/registers/registersview.h b/debuggers/common/registers/registersview.h
--- a/debuggers/common/registers/registersview.h
+++ b/debuggers/common/registers/registersview.h
@@ -38,7 +38,7 @@
     Q_OBJECT
 
 public:
-    RegistersView(QWidget* p = 0);
+    RegistersView(QWidget* p = nullptr);
 
     void enable(bool enabled);
 
diff --git a/debuggers/common/registers/registersview.cpp b/debuggers/common/registers/registersview.cpp
--- a/debuggers/common/registers/registersview.cpp
+++ b/debuggers/common/registers/registersview.cpp
@@ -38,7 +38,7 @@
 }
 
 RegistersView::RegistersView(QWidget* p)
-    : QWidget(p), m_menu(new QMenu(this)), m_mapper(new QSignalMapper(this)), m_modelsManager(0)
+    : QWidget(p), m_menu(new QMenu(this)), m_mapper(new QSignalMapper(this)), m_modelsManager(nullptr)
 {
     setupUi(this);
 
@@ -145,7 +145,7 @@
             return a;
         }
     }
-    return 0;
+    return nullptr;
 }
 
 void RegistersView::addView(QTableView* view, int idx)
diff --git a/debuggers/common/stty.cpp b/debuggers/common/stty.cpp
--- a/debuggers/common/stty.cpp
+++ b/debuggers/common/stty.cpp
@@ -97,7 +97,7 @@
             ::exit(1);
 
         QString path = QStandardPaths::findExecutable(BASE_CHOWN);
-        execle(QFile::encodeName(path), BASE_CHOWN, grant?"--grant":"--revoke", (void *)0, NULL);
+        execle(QFile::encodeName(path), BASE_CHOWN, grant?"--grant":"--revoke", (void *)nullptr, NULL);
         ::exit(1); // should not be reached
     }
     if (pid > 0) {
@@ -124,9 +124,9 @@
 
 STTY::STTY(bool ext, const QString &termAppName)
     : QObject(),
-      out(0),
+      out(nullptr),
       ttySlave(""),
-      m_externalTerminal(0),
+      m_externalTerminal(nullptr),
       external_(ext)
 {
     if (ext) {
diff --git a/debuggers/common/widgets/disassemblewidget.h b/debuggers/common/widgets/disassemblewidget.h
--- a/debuggers/common/widgets/disassemblewidget.h
+++ b/debuggers/common/widgets/disassemblewidget.h
@@ -51,7 +51,7 @@
 {
     Q_OBJECT
 public:
-    SelectAddressDialog(QWidget *parent = 0);
+    SelectAddressDialog(QWidget *parent = nullptr);
 
     QString address() const;
     void setAddress(const QString& address);
@@ -109,7 +109,7 @@
         ColumnCount
     };
 
-    DisassembleWidget( MIDebuggerPlugin* plugin, QWidget *parent=0 );
+    DisassembleWidget( MIDebuggerPlugin* plugin, QWidget *parent=nullptr );
     ~DisassembleWidget() override;
 
 Q_SIGNALS:
diff --git a/debuggers/common/widgets/disassemblewidget.cpp b/debuggers/common/widgets/disassemblewidget.cpp
--- a/debuggers/common/widgets/disassemblewidget.cpp
+++ b/debuggers/common/widgets/disassemblewidget.cpp
@@ -265,7 +265,7 @@
 {
     MIDebugSession *session = qobject_cast<MIDebugSession*>(s);
 
-    enableControls( session != NULL ); // disable if session closed
+    enableControls( session != nullptr ); // disable if session closed
 
     m_registersManager->setSession(session);
 
diff --git a/debuggers/gdb/gdb.h b/debuggers/gdb/gdb.h
--- a/debuggers/gdb/gdb.h
+++ b/debuggers/gdb/gdb.h
@@ -31,7 +31,7 @@
 {
     Q_OBJECT
 public:
-    explicit GdbDebugger(QObject* parent = 0);
+    explicit GdbDebugger(QObject* parent = nullptr);
     ~GdbDebugger() override;
 
     bool start(KConfigGroup& config, const QStringList& extraArguments = {}) override;
diff --git a/debuggers/gdb/gdbconfigpage.h b/debuggers/gdb/gdbconfigpage.h
--- a/debuggers/gdb/gdbconfigpage.h
+++ b/debuggers/gdb/gdbconfigpage.h
@@ -58,11 +58,11 @@
 {
 Q_OBJECT
 public:
-    GdbConfigPage( QWidget* parent = 0 );
+    GdbConfigPage( QWidget* parent = nullptr );
     ~GdbConfigPage() override;
     QIcon icon() const override;
-    void loadFromConfiguration(const KConfigGroup& cfg, KDevelop::IProject* = 0) override;
-    void saveToConfiguration(KConfigGroup, KDevelop::IProject* = 0 ) const override;
+    void loadFromConfiguration(const KConfigGroup& cfg, KDevelop::IProject* = nullptr) override;
+    void saveToConfiguration(KConfigGroup, KDevelop::IProject* = nullptr ) const override;
     QString title() const override;
 private:
     Ui::GdbConfigPage* ui;
diff --git a/debuggers/gdb/gdbconfigpage.cpp b/debuggers/gdb/gdbconfigpage.cpp
--- a/debuggers/gdb/gdbconfigpage.cpp
+++ b/debuggers/gdb/gdbconfigpage.cpp
@@ -146,7 +146,7 @@
     Q_ASSERT(cfg);
     if( !cfg )
     {
-        return 0;
+        return nullptr;
     }
     if( launchMode == "debug" )
     {
@@ -172,7 +172,7 @@
         return new KDevelop::ExecuteCompositeJob( KDevelop::ICore::self()->runController(), l );
     }
     qWarning() << "Unknown launch mode" << launchMode << "for config:" << cfg->name();
-    return 0;
+    return nullptr;
 }
 
 QStringList GdbLauncher::supportedModes() const
diff --git a/debuggers/gdb/gdboutputwidget.h b/debuggers/gdb/gdboutputwidget.h
--- a/debuggers/gdb/gdboutputwidget.h
+++ b/debuggers/gdb/gdboutputwidget.h
@@ -52,7 +52,7 @@
     Q_OBJECT
 
 public:
-    GDBOutputWidget(CppDebuggerPlugin* plugin, QWidget *parent=0 );
+    GDBOutputWidget(CppDebuggerPlugin* plugin, QWidget *parent=nullptr );
     ~GDBOutputWidget() override;
 
     void savePartialProjectSession();
diff --git a/debuggers/gdb/gdboutputwidget.cpp b/debuggers/gdb/gdboutputwidget.cpp
--- a/debuggers/gdb/gdboutputwidget.cpp
+++ b/debuggers/gdb/gdboutputwidget.cpp
@@ -53,9 +53,9 @@
 
 GDBOutputWidget::GDBOutputWidget(CppDebuggerPlugin* plugin, QWidget *parent) :
     QWidget(parent),
-    m_userGDBCmdEditor(0),
-    m_Interrupt(0),
-    m_gdbView(0),
+    m_userGDBCmdEditor(nullptr),
+    m_Interrupt(nullptr),
+    m_gdbView(nullptr),
     showInternalCommands_(false),
     maxLines_(5000)
 {
diff --git a/debuggers/gdb/unittests/debugeecrash.cpp b/debuggers/gdb/unittests/debugeecrash.cpp
--- a/debuggers/gdb/unittests/debugeecrash.cpp
+++ b/debuggers/gdb/unittests/debugeecrash.cpp
@@ -21,7 +21,7 @@
     int j = 0;
     j++;
     j++;
-    int *i=0;
+    int *i=nullptr;
     *i = 0;
 }
 int main() {
diff --git a/debuggers/gdb/unittests/test_gdb.cpp b/debuggers/gdb/unittests/test_gdb.cpp
--- a/debuggers/gdb/unittests/test_gdb.cpp
+++ b/debuggers/gdb/unittests/test_gdb.cpp
@@ -156,8 +156,8 @@
     const KConfigGroup config() const override { return cfg; }
     KConfigGroup config() override { return cfg; };
     QString name() const override { return QString("Test-Launch"); }
-    KDevelop::IProject* project() const override { return 0; }
-    KDevelop::LaunchConfigurationType* type() const override { return 0; }
+    KDevelop::IProject* project() const override { return nullptr; }
+    KDevelop::LaunchConfigurationType* type() const override { return nullptr; }
 
     KConfig *rootConfig() { return c; }
 private:
@@ -2028,7 +2028,7 @@
 
     foreach (const QString & console, QStringList() << "konsole" << "xterm" << "xfce4-terminal" << "gnome-terminal") {
 
-        TestDebugSession* session = 0;
+        TestDebugSession* session = nullptr;
         if (QStandardPaths::findExecutable(console).isEmpty()) {
             continue;
         }
diff --git a/debuggers/lldb/lldbdebugger.h b/debuggers/lldb/lldbdebugger.h
--- a/debuggers/lldb/lldbdebugger.h
+++ b/debuggers/lldb/lldbdebugger.h
@@ -31,7 +31,7 @@
 {
     Q_OBJECT
 public:
-    explicit LldbDebugger(QObject* parent = 0);
+    explicit LldbDebugger(QObject* parent = nullptr);
     ~LldbDebugger() override;
 
     bool start(KConfigGroup& config, const QStringList& extraArguments = {}) override;
diff --git a/debuggers/lldb/unittests/debugees/debugeecrash.cpp b/debuggers/lldb/unittests/debugees/debugeecrash.cpp
--- a/debuggers/lldb/unittests/debugees/debugeecrash.cpp
+++ b/debuggers/lldb/unittests/debugees/debugeecrash.cpp
@@ -21,7 +21,7 @@
     int j = 0;
     j++;
     j++;
-    int *i=0;
+    int *i=nullptr;
     *i = 0;
 }
 int main() {
diff --git a/debuggers/lldb/unittests/test_lldb.cpp b/debuggers/lldb/unittests/test_lldb.cpp
--- a/debuggers/lldb/unittests/test_lldb.cpp
+++ b/debuggers/lldb/unittests/test_lldb.cpp
@@ -111,8 +111,8 @@
     const KConfigGroup config() const override { return cfg; }
     KConfigGroup config() override { return cfg; };
     QString name() const override { return QString("Test-Launch"); }
-    KDevelop::IProject* project() const override { return 0; }
-    KDevelop::LaunchConfigurationType* type() const override { return 0; }
+    KDevelop::IProject* project() const override { return nullptr; }
+    KDevelop::LaunchConfigurationType* type() const override { return nullptr; }
 
     KConfig *rootConfig() { return c; }
 private:
diff --git a/debuggers/lldb/unittests/test_lldbformatters.cpp b/debuggers/lldb/unittests/test_lldbformatters.cpp
--- a/debuggers/lldb/unittests/test_lldbformatters.cpp
+++ b/debuggers/lldb/unittests/test_lldbformatters.cpp
@@ -91,8 +91,8 @@
     const KConfigGroup config() const override { return cfg; }
     KConfigGroup config() override { return cfg; };
     QString name() const override { return QString("Test-Launch"); }
-    KDevelop::IProject* project() const override { return 0; }
-    KDevelop::LaunchConfigurationType* type() const override { return 0; }
+    KDevelop::IProject* project() const override { return nullptr; }
+    KDevelop::LaunchConfigurationType* type() const override { return nullptr; }
 
     KConfig *rootConfig() { return c; }
 private:
diff --git a/debuggers/lldb/widgets/lldbconfigpage.h b/debuggers/lldb/widgets/lldbconfigpage.h
--- a/debuggers/lldb/widgets/lldbconfigpage.h
+++ b/debuggers/lldb/widgets/lldbconfigpage.h
@@ -34,7 +34,7 @@
 {
     Q_OBJECT
 public:
-    LldbConfigPage( QWidget* parent = 0 );
+    LldbConfigPage( QWidget* parent = nullptr );
     ~LldbConfigPage() override;
 
     QIcon icon() const override;
diff --git a/documentation/manpage/manpagedocumentation.h b/documentation/manpage/manpagedocumentation.h
--- a/documentation/manpage/manpagedocumentation.h
+++ b/documentation/manpage/manpagedocumentation.h
@@ -44,7 +44,7 @@
         QString name() const override { return m_name; }
         QString description() const override;
         virtual bool providesWidget() const;
-        QWidget* documentationWidget(KDevelop::DocumentationFindWidget* findWidget, QWidget* parent = 0) override;
+        QWidget* documentationWidget(KDevelop::DocumentationFindWidget* findWidget, QWidget* parent = nullptr) override;
         KDevelop::IDocumentationProvider* provider() const override;
         static ManPagePlugin* s_provider;
 
@@ -65,7 +65,7 @@
         KDevelop::IDocumentationProvider* provider() const override;
         QString name() const override;
         QString description() const override { return name(); }
-        QWidget* documentationWidget ( KDevelop::DocumentationFindWidget* findWidget, QWidget* parent = 0 ) override;
+        QWidget* documentationWidget ( KDevelop::DocumentationFindWidget* findWidget, QWidget* parent = nullptr ) override;
 };
 
 
diff --git a/documentation/manpage/manpagedocumentation.cpp b/documentation/manpage/manpagedocumentation.cpp
--- a/documentation/manpage/manpagedocumentation.cpp
+++ b/documentation/manpage/manpagedocumentation.cpp
@@ -36,7 +36,7 @@
 #include <kio/jobclasses.h>
 #include <documentation/standarddocumentationview.h>
 
-ManPagePlugin* ManPageDocumentation::s_provider=0;
+ManPagePlugin* ManPageDocumentation::s_provider=nullptr;
 
 
 ManPageDocumentation::ManPageDocumentation(const QString& name, const QUrl& url)
diff --git a/documentation/manpage/manpagedocumentationwidget.h b/documentation/manpage/manpagedocumentationwidget.h
--- a/documentation/manpage/manpagedocumentationwidget.h
+++ b/documentation/manpage/manpagedocumentationwidget.h
@@ -32,7 +32,7 @@
 {
     Q_OBJECT
 public:
-    explicit ManPageDocumentationWidget(QWidget *parent = 0);
+    explicit ManPageDocumentationWidget(QWidget *parent = nullptr);
 public slots:
     void manIndexLoaded();
     void sectionListUpdated();
diff --git a/documentation/manpage/manpagedocumentationwidget.cpp b/documentation/manpage/manpagedocumentationwidget.cpp
--- a/documentation/manpage/manpagedocumentationwidget.cpp
+++ b/documentation/manpage/manpagedocumentationwidget.cpp
@@ -30,7 +30,7 @@
 
 ManPageDocumentationWidget::ManPageDocumentationWidget(QWidget *parent)
     : QStackedWidget(parent)
-    , m_loadingWidget(0)
+    , m_loadingWidget(nullptr)
 {
     ManPageModel* model = ManPageDocumentation::s_provider->model();
     m_treeView = new QTreeView(this);
@@ -73,7 +73,7 @@
     if(m_loadingWidget){
         removeWidget(m_loadingWidget);
         delete m_loadingWidget;
-        m_loadingWidget = 0;
+        m_loadingWidget = nullptr;
     }
 }
 
diff --git a/documentation/manpage/manpagemodel.h b/documentation/manpage/manpagemodel.h
--- a/documentation/manpage/manpagemodel.h
+++ b/documentation/manpage/manpagemodel.h
@@ -37,7 +37,7 @@
     Q_OBJECT
 
 public:
-    ManPageModel(QObject* parent = 0);
+    ManPageModel(QObject* parent = nullptr);
     ~ManPageModel() override;
 
     /**
diff --git a/documentation/qthelp/qthelpconfig.h b/documentation/qthelp/qthelpconfig.h
--- a/documentation/qthelp/qthelpconfig.h
+++ b/documentation/qthelp/qthelpconfig.h
@@ -40,7 +40,7 @@
     Q_OBJECT
 
     public:
-      explicit QtHelpConfig(QtHelpPlugin* plugin, QWidget *parent = 0);
+      explicit QtHelpConfig(QtHelpPlugin* plugin, QWidget *parent = nullptr);
       ~QtHelpConfig() override;
 
       bool checkNamespace(const QString &filename, QTreeWidgetItem* modifiedItem);
diff --git a/documentation/qthelp/qthelpconfig.cpp b/documentation/qthelp/qthelpconfig.cpp
--- a/documentation/qthelp/qthelpconfig.cpp
+++ b/documentation/qthelp/qthelpconfig.cpp
@@ -50,8 +50,8 @@
 class QtHelpConfigEditDialog : public QDialog, public Ui_QtHelpConfigEditDialog
 {
 public:
-    explicit QtHelpConfigEditDialog(QTreeWidgetItem* modifiedItem, QtHelpConfig* parent = 0,
-                                    Qt::WindowFlags f = 0)
+    explicit QtHelpConfigEditDialog(QTreeWidgetItem* modifiedItem, QtHelpConfig* parent = nullptr,
+                                    Qt::WindowFlags f = nullptr)
         : QDialog(parent, f)
         , m_modifiedItem(modifiedItem)
         , m_config(parent)
@@ -197,7 +197,7 @@
 
 void QtHelpConfig::add()
 {
-    QtHelpConfigEditDialog dialog(0, this);
+    QtHelpConfigEditDialog dialog(nullptr, this);
     if (!dialog.exec())
         return;
 
diff --git a/documentation/qthelp/qthelpdocumentation.h b/documentation/qthelp/qthelpdocumentation.h
--- a/documentation/qthelp/qthelpdocumentation.h
+++ b/documentation/qthelp/qthelpdocumentation.h
@@ -79,7 +79,7 @@
     Q_OBJECT
     public:
         HomeDocumentation();
-        QWidget* documentationWidget(KDevelop::DocumentationFindWidget* findWidget, QWidget* parent = 0) override;
+        QWidget* documentationWidget(KDevelop::DocumentationFindWidget* findWidget, QWidget* parent = nullptr) override;
         QString description() const override { return QString(); }
         QString name() const override;
         KDevelop::IDocumentationProvider* provider() const override;
diff --git a/documentation/qthelp/qthelpdocumentation.cpp b/documentation/qthelp/qthelpdocumentation.cpp
--- a/documentation/qthelp/qthelpdocumentation.cpp
+++ b/documentation/qthelp/qthelpdocumentation.cpp
@@ -98,14 +98,14 @@
 
 }
 
-QtHelpProviderAbstract* QtHelpDocumentation::s_provider=0;
+QtHelpProviderAbstract* QtHelpDocumentation::s_provider=nullptr;
 
 QtHelpDocumentation::QtHelpDocumentation(const QString& name, const QMap<QString, QUrl>& info)
-    : m_provider(s_provider), m_name(name), m_info(info), m_current(info.constBegin()), lastView(0)
+    : m_provider(s_provider), m_name(name), m_info(info), m_current(info.constBegin()), lastView(nullptr)
 {}
 
 QtHelpDocumentation::QtHelpDocumentation(const QString& name, const QMap<QString, QUrl>& info, const QString& key)
-    : m_provider(s_provider), m_name(name), m_info(info), m_current(m_info.find(key)), lastView(0)
+    : m_provider(s_provider), m_name(name), m_info(info), m_current(m_info.find(key)), lastView(nullptr)
 { Q_ASSERT(m_current!=m_info.constEnd()); }
 
 QtHelpDocumentation::~QtHelpDocumentation()
diff --git a/documentation/qthelp/qthelpplugin.cpp b/documentation/qthelp/qthelpplugin.cpp
--- a/documentation/qthelp/qthelpplugin.cpp
+++ b/documentation/qthelp/qthelpplugin.cpp
@@ -31,7 +31,7 @@
 #include "debug.h"
 #include "qthelpconfig.h"
 
-QtHelpPlugin *QtHelpPlugin::s_plugin = 0;
+QtHelpPlugin *QtHelpPlugin::s_plugin = nullptr;
 
 K_PLUGIN_FACTORY_WITH_JSON(QtHelpPluginFactory, "kdevqthelp.json", registerPlugin<QtHelpPlugin>(); )
 
@@ -107,7 +107,7 @@
         QString iconName = iconList.at(i);
         QString nameSpace = QHelpEngineCore::namespaceName(fileName);
         if(!nameSpace.isEmpty()){
-            QtHelpProvider *provider = 0;
+            QtHelpProvider *provider = nullptr;
             foreach(QtHelpProvider* oldProvider, oldList){
                 if(QHelpEngineCore::namespaceName(oldProvider->fileName()) == nameSpace){
                     provider = oldProvider;
diff --git a/documentation/qthelp/tests/test_qthelpplugin.cpp b/documentation/qthelp/tests/test_qthelpplugin.cpp
--- a/documentation/qthelp/tests/test_qthelpplugin.cpp
+++ b/documentation/qthelp/tests/test_qthelpplugin.cpp
@@ -185,7 +185,7 @@
     QVERIFY(ctx);
     auto decl = ctx->findDeclarations(QualifiedIdentifier("o")).first();
     QVERIFY(decl);
-    auto typeDecl = dynamic_cast<const IdentifiedType*>(decl->type<PointerType>()->baseType().data())->declaration(0);
+    auto typeDecl = dynamic_cast<const IdentifiedType*>(decl->type<PointerType>()->baseType().data())->declaration(nullptr);
     QVERIFY(typeDecl);
 
     auto provider = dynamic_cast<QtHelpProviderAbstract*>(m_plugin->providers().at(0));
diff --git a/formatters/astyle/astyle_formatter.cpp b/formatters/astyle/astyle_formatter.cpp
--- a/formatters/astyle/astyle_formatter.cpp
+++ b/formatters/astyle/astyle_formatter.cpp
@@ -51,7 +51,7 @@
     while(hasMoreLines())
         os << QString::fromUtf8(nextLine().c_str()) << endl;
 
-    init(0);
+    init(nullptr);
 
     return extractFormattedTextFromContext(output, text, leftContext, rightContext, m_options["FillCount"].toInt());
 }
diff --git a/formatters/astyle/astyle_preferences.h b/formatters/astyle/astyle_preferences.h
--- a/formatters/astyle/astyle_preferences.h
+++ b/formatters/astyle/astyle_preferences.h
@@ -33,7 +33,7 @@
 public:
     enum Language { CPP, Java, CSharp};
 
-    AStylePreferences(Language lang=CPP, QWidget *parent=0);
+    AStylePreferences(Language lang=CPP, QWidget *parent=nullptr);
     ~AStylePreferences() override;
 
     void load(const KDevelop::SourceFormatterStyle &style) override;
diff --git a/kdeintegration/executeplasmoid/executeplasmoidplugin.cpp b/kdeintegration/executeplasmoid/executeplasmoidplugin.cpp
--- a/kdeintegration/executeplasmoid/executeplasmoidplugin.cpp
+++ b/kdeintegration/executeplasmoid/executeplasmoidplugin.cpp
@@ -51,7 +51,7 @@
 {
     core()->runController()->removeConfigurationType( m_configType );
     delete m_configType;
-    m_configType = 0;
+    m_configType = nullptr;
 }
 
 QUrl ExecutePlasmoidPlugin::executable(ILaunchConfiguration* config, QString& /*error*/) const
diff --git a/kdeintegration/executeplasmoid/plasmoidexecutionconfig.h b/kdeintegration/executeplasmoid/plasmoidexecutionconfig.h
--- a/kdeintegration/executeplasmoid/plasmoidexecutionconfig.h
+++ b/kdeintegration/executeplasmoid/plasmoidexecutionconfig.h
@@ -35,8 +35,8 @@
 Q_OBJECT
 public:
     PlasmoidExecutionConfig( QWidget* parent );
-    void loadFromConfiguration( const KConfigGroup& cfg, KDevelop::IProject* project = 0 ) override;
-    void saveToConfiguration( KConfigGroup cfg, KDevelop::IProject* project = 0 ) const override;
+    void loadFromConfiguration( const KConfigGroup& cfg, KDevelop::IProject* project = nullptr ) override;
+    void saveToConfiguration( KConfigGroup cfg, KDevelop::IProject* project = nullptr ) const override;
     QString title() const override;
     QIcon icon() const override;
 };
diff --git a/kdeintegration/executeplasmoid/plasmoidexecutionconfig.cpp b/kdeintegration/executeplasmoid/plasmoidexecutionconfig.cpp
--- a/kdeintegration/executeplasmoid/plasmoidexecutionconfig.cpp
+++ b/kdeintegration/executeplasmoid/plasmoidexecutionconfig.cpp
@@ -157,7 +157,7 @@
     Q_ASSERT(cfg);
     if( !cfg )
     {
-        return 0;
+        return nullptr;
     }
 
     if( launchMode == "execute" )
@@ -171,7 +171,7 @@
         return new KDevelop::ExecuteCompositeJob( KDevelop::ICore::self()->runController(), jobs );
     }
     qWarning() << "Unknown launch mode " << launchMode << "for config:" << cfg->name();
-    return 0;
+    return nullptr;
 }
 
 KJob* PlasmoidLauncher::calculateDependencies(KDevelop::ILaunchConfiguration* cfg)
@@ -199,7 +199,7 @@
         job->updateJobName();
         return job;
     }
-    return 0;
+    return nullptr;
 }
 
 KJob* PlasmoidLauncher::dependencies(KDevelop::ILaunchConfiguration* cfg)
@@ -303,7 +303,7 @@
         }
     }
 
-    QMenu *m = 0;
+    QMenu *m = nullptr;
     if(!found.isEmpty()) {
         m = new QMenu(i18n("Plasmoids"));
         m->addActions(found);
diff --git a/languages/clang/codegen/adaptsignatureaction.cpp b/languages/clang/codegen/adaptsignatureaction.cpp
--- a/languages/clang/codegen/adaptsignatureaction.cpp
+++ b/languages/clang/codegen/adaptsignatureaction.cpp
@@ -117,7 +117,7 @@
     changes.setReplacementPolicy(DocumentChangeSet::WarnOnFailedChange);
     DocumentChangeSet::ChangeResult result = changes.applyAllChanges();
     if (!result) {
-        KMessageBox::error(0, i18n("Failed to apply changes: %1", result.m_failureReason));
+        KMessageBox::error(nullptr, i18n("Failed to apply changes: %1", result.m_failureReason));
     }
     emit executed(this);
 
diff --git a/languages/clang/codegen/adaptsignatureassistant.cpp b/languages/clang/codegen/adaptsignatureassistant.cpp
--- a/languages/clang/codegen/adaptsignatureassistant.cpp
+++ b/languages/clang/codegen/adaptsignatureassistant.cpp
@@ -133,7 +133,7 @@
        }
      */
 
-    Declaration* otherSide = 0;
+    Declaration* otherSide = nullptr;
     FunctionDefinition* definition = dynamic_cast<FunctionDefinition*>(funDecl);
     if (definition) {
         m_editingDefinition = true;
diff --git a/languages/clang/codegen/clangrefactoring.h b/languages/clang/codegen/clangrefactoring.h
--- a/languages/clang/codegen/clangrefactoring.h
+++ b/languages/clang/codegen/clangrefactoring.h
@@ -40,7 +40,7 @@
     Q_OBJECT
 
 public:
-    explicit ClangRefactoring(QObject* parent = 0);
+    explicit ClangRefactoring(QObject* parent = nullptr);
 
     void fillContextMenu(KDevelop::ContextMenuExtension& extension, KDevelop::Context* context) override;
 
diff --git a/languages/clang/codegen/codegenhelper.cpp b/languages/clang/codegen/codegenhelper.cpp
--- a/languages/clang/codegen/codegenhelper.cpp
+++ b/languages/clang/codegen/codegenhelper.cpp
@@ -376,7 +376,7 @@
         return IndexedTypeIdentifier();
     }
 
-    IndexedTypeIdentifier identifier = identifierForType(type, ctx ? ctx->topContext() : 0);
+    IndexedTypeIdentifier identifier = identifierForType(type, ctx ? ctx->topContext() : nullptr);
 
     identifier = stripPrefixIdentifiers(identifier, stripPrefix);
 
diff --git a/languages/clang/duchain/builder.cpp b/languages/clang/duchain/builder.cpp
--- a/languages/clang/duchain/builder.cpp
+++ b/languages/clang/duchain/builder.cpp
@@ -555,7 +555,7 @@
         return t;
     }
 
-    template<CXTypeKind TK, EnableIf<CursorKindTraits::delayedTypeName(TK) != 0> = dummy>
+    template<CXTypeKind TK, EnableIf<CursorKindTraits::delayedTypeName(TK) != nullptr> = dummy>
     AbstractType *createType(CXType, CXCursor /*parent*/)
     {
         auto t = new DelayedType;
diff --git a/languages/clang/duchain/clangducontext.cpp b/languages/clang/duchain/clangducontext.cpp
--- a/languages/clang/duchain/clangducontext.cpp
+++ b/languages/clang/duchain/clangducontext.cpp
@@ -53,7 +53,7 @@
 {
     if (!decl) {
         clangDebug() << "no declaration, not returning navigationwidget";
-        return 0;
+        return nullptr;
     }
     return new ClangNavigationWidget(DeclarationPointer(decl), hints);
 }
diff --git a/languages/clang/duchain/clangindex.cpp b/languages/clang/duchain/clangindex.cpp
--- a/languages/clang/duchain/clangindex.cpp
+++ b/languages/clang/duchain/clangindex.cpp
@@ -105,7 +105,7 @@
             QSet<TopDUContext*> visited;
             while(true) {
                 visited.insert(tuTop);
-                TopDUContext* next = NULL;
+                TopDUContext* next = nullptr;
                 auto importers = tuTop->indexedImporters();
                 foreach(IndexedDUContext ctx, importers) {
                     if (ctx.data()) {
diff --git a/languages/clang/duchain/navigationwidget.cpp b/languages/clang/duchain/navigationwidget.cpp
--- a/languages/clang/duchain/navigationwidget.cpp
+++ b/languages/clang/duchain/navigationwidget.cpp
@@ -34,7 +34,7 @@
 class DeclarationNavigationContext : public AbstractDeclarationNavigationContext
 {
 public:
-    DeclarationNavigationContext(const DeclarationPointer& decl, AbstractNavigationContext* previousContext = 0)
+    DeclarationNavigationContext(const DeclarationPointer& decl, AbstractNavigationContext* previousContext = nullptr)
         : AbstractDeclarationNavigationContext(decl, {}, previousContext)
     {
     }
diff --git a/languages/clang/tests/test_assistants.cpp b/languages/clang/tests/test_assistants.cpp
--- a/languages/clang/tests/test_assistants.cpp
+++ b/languages/clang/tests/test_assistants.cpp
@@ -57,7 +57,7 @@
 
 QTEST_MAIN(TestAssistants)
 
-ForegroundLock *globalTestLock = 0;
+ForegroundLock *globalTestLock = nullptr;
 StaticAssistantsManager *staticAssistantsManager() { return Core::self()->languageController()->staticAssistantsManager(); }
 
 void TestAssistants::initTestCase()
@@ -83,7 +83,7 @@
 {
     Core::self()->cleanup();
     delete globalTestLock;
-    globalTestLock = 0;
+    globalTestLock = nullptr;
 }
 
 static QUrl createFile(const QString& fileContents, QString extension, int id)
diff --git a/languages/clang/tests/test_buddies.cpp b/languages/clang/tests/test_buddies.cpp
--- a/languages/clang/tests/test_buddies.cpp
+++ b/languages/clang/tests/test_buddies.cpp
@@ -422,11 +422,11 @@
 
     QTemporaryDir dirA;
 
-    TestFile header("void myfunction();\n", "h", 0, dirA.path());
-    TestFile other("void otherfunction() {}\n", "cpp", 0, dirA.path());
+    TestFile header("void myfunction();\n", "h", nullptr, dirA.path());
+    TestFile other("void otherfunction() {}\n", "cpp", nullptr, dirA.path());
     TestFile source(
         QString("#include \"%1\"\nvoid myfunction() {}\n").arg(header.url().toUrl().fileName()),
-        "cpp", 0, dirA.path()
+        "cpp", nullptr, dirA.path()
     );
 
     header.parseAndWait();
@@ -469,14 +469,14 @@
 
     QTemporaryDir dirA;
 
-    TestFile header("void func1();\nvoid func2();\nvoid func3();\n", "h", 0, dirA.path());
+    TestFile header("void func1();\nvoid func2();\nvoid func3();\n", "h", nullptr, dirA.path());
     TestFile source1(
         QString("#include \"%1\"\nvoid func1() {}\n").arg(header.url().toUrl().fileName()),
-        "cpp", 0, dirA.path()
+        "cpp", nullptr, dirA.path()
     );
     TestFile source2(
         QString("#include \"%1\"\nvoid func2() {}\nvoid func3() {}\n").arg(header.url().toUrl().fileName()),
-        "cpp", 0, dirA.path()
+        "cpp", nullptr, dirA.path()
     );
 
     // -> buddy(header) should resolve to source2
diff --git a/languages/clang/tests/test_codecompletion.cpp b/languages/clang/tests/test_codecompletion.cpp
--- a/languages/clang/tests/test_codecompletion.cpp
+++ b/languages/clang/tests/test_codecompletion.cpp
@@ -920,7 +920,7 @@
     QTemporaryDir tempDir;
     QDir dir(tempDir.path());
     QVERIFY(dir.mkpath("foo/bar/asdf"));
-    TestFile file(code, "cpp", 0, tempDir.path());
+    TestFile file(code, "cpp", nullptr, tempDir.path());
     IncludeTester tester(executeIncludePathCompletion(&file, cursor));
     QVERIFY(tester.completionContext);
     QVERIFY(tester.completionContext->isValid());
diff --git a/languages/clang/tests/test_duchain.cpp b/languages/clang/tests/test_duchain.cpp
--- a/languages/clang/tests/test_duchain.cpp
+++ b/languages/clang/tests/test_duchain.cpp
@@ -540,7 +540,7 @@
     DUContext* ctx = file.topContext().data();
     QVERIFY(ctx);
     QCOMPARE(ctx->localDeclarations().size(), 3);
-    Declaration* decl = 0;
+    Declaration* decl = nullptr;
 
     // check 'foo' declaration
     decl = ctx->localDeclarations()[0];
diff --git a/languages/clang/util/clangtypes.cpp b/languages/clang/util/clangtypes.cpp
--- a/languages/clang/util/clangtypes.cpp
+++ b/languages/clang/util/clangtypes.cpp
@@ -38,7 +38,7 @@
 {
     uint line = 0;
     uint column = 0;
-    clang_getFileLocation(loc, 0, &line, &column, 0);
+    clang_getFileLocation(loc, nullptr, &line, &column, nullptr);
     return {static_cast<int>(line-1), static_cast<int>(column-1)};
 }
 
@@ -101,7 +101,7 @@
     uint line = 0;
     uint column = 0;
     CXFile file;
-    clang_getFileLocation(location, &file, &line, &column, 0);
+    clang_getFileLocation(location, &file, &line, &column, nullptr);
     ClangString fileName(clang_getFileName(file));
     return {IndexedString(fileName.c_str()), {static_cast<int>(line-1), static_cast<int>(column-1)}};
 }
@@ -155,7 +155,7 @@
 {
     auto start = clang_getRangeStart(m_range);
     CXFile file;
-    clang_getFileLocation(start, &file, 0, 0, 0);
+    clang_getFileLocation(start, &file, nullptr, nullptr, nullptr);
     ClangString fileName(clang_getFileName(file));
     return {IndexedString(QUrl::fromLocalFile(fileName.toString()).adjusted(QUrl::NormalizePathSegments)), toRange()};
 }
diff --git a/languages/plugins/custom-definesandincludes/compilerprovider/widget/compilersmodel.h b/languages/plugins/custom-definesandincludes/compilerprovider/widget/compilersmodel.h
--- a/languages/plugins/custom-definesandincludes/compilerprovider/widget/compilersmodel.h
+++ b/languages/plugins/custom-definesandincludes/compilerprovider/widget/compilersmodel.h
@@ -41,7 +41,7 @@
         CompilerDataRole = Qt::UserRole + 1
     };
 
-    CompilersModel( QObject* parent = 0 );
+    CompilersModel( QObject* parent = nullptr );
 
     void setCompilers( const QVector<CompilerPointer>& compilers );
     QVector<CompilerPointer> compilers() const;
diff --git a/languages/plugins/custom-definesandincludes/compilerprovider/widget/compilersmodel.cpp b/languages/plugins/custom-definesandincludes/compilerprovider/widget/compilersmodel.cpp
--- a/languages/plugins/custom-definesandincludes/compilerprovider/widget/compilersmodel.cpp
+++ b/languages/plugins/custom-definesandincludes/compilerprovider/widget/compilersmodel.cpp
@@ -194,7 +194,7 @@
 Qt::ItemFlags CompilersModel::flags(const QModelIndex& index) const
 {
     if (!index.isValid()) {
-        return 0;
+        return nullptr;
     }
 
     return Qt::ItemIsEnabled | Qt::ItemIsSelectable;
diff --git a/languages/plugins/custom-definesandincludes/compilerprovider/widget/compilerswidget.h b/languages/plugins/custom-definesandincludes/compilerprovider/widget/compilerswidget.h
--- a/languages/plugins/custom-definesandincludes/compilerprovider/widget/compilerswidget.h
+++ b/languages/plugins/custom-definesandincludes/compilerprovider/widget/compilerswidget.h
@@ -46,7 +46,7 @@
     Q_OBJECT
 
 public:
-    explicit CompilersWidget(QWidget* parent = 0);
+    explicit CompilersWidget(QWidget* parent = nullptr);
     ~CompilersWidget() override;
 
     void setCompilers(const QVector<CompilerPointer>& compilers);
diff --git a/languages/plugins/custom-definesandincludes/kcm_widget/definesmodel.h b/languages/plugins/custom-definesandincludes/kcm_widget/definesmodel.h
--- a/languages/plugins/custom-definesandincludes/kcm_widget/definesmodel.h
+++ b/languages/plugins/custom-definesandincludes/kcm_widget/definesmodel.h
@@ -28,7 +28,7 @@
 {
 Q_OBJECT
 public:
-    DefinesModel( QObject* parent = 0 );
+    DefinesModel( QObject* parent = nullptr );
     void setDefines( const KDevelop::Defines& defines );
     KDevelop::Defines defines() const;
     QVariant data(const QModelIndex& index, int role = Qt::DisplayRole) const override;
diff --git a/languages/plugins/custom-definesandincludes/kcm_widget/definesmodel.cpp b/languages/plugins/custom-definesandincludes/kcm_widget/definesmodel.cpp
--- a/languages/plugins/custom-definesandincludes/kcm_widget/definesmodel.cpp
+++ b/languages/plugins/custom-definesandincludes/kcm_widget/definesmodel.cpp
@@ -126,11 +126,11 @@
 Qt::ItemFlags DefinesModel::flags( const QModelIndex& index ) const
 {
     if( !index.isValid() ) {
-        return 0;
+        return nullptr;
     }
 
     if( index.row() == m_defines.count() && index.column() == 1 ) {
-        return 0;
+        return nullptr;
     }
     return Qt::ItemFlags( Qt::ItemIsEditable | Qt::ItemIsSelectable | Qt::ItemIsEnabled );
 }
diff --git a/languages/plugins/custom-definesandincludes/kcm_widget/defineswidget.h b/languages/plugins/custom-definesandincludes/kcm_widget/defineswidget.h
--- a/languages/plugins/custom-definesandincludes/kcm_widget/defineswidget.h
+++ b/languages/plugins/custom-definesandincludes/kcm_widget/defineswidget.h
@@ -41,7 +41,7 @@
 {
 Q_OBJECT
 public:
-    DefinesWidget( QWidget* parent = 0 );
+    DefinesWidget( QWidget* parent = nullptr );
     void setDefines( const KDevelop::Defines& defines );
     void clear();
 signals:
diff --git a/languages/plugins/custom-definesandincludes/kcm_widget/includesmodel.h b/languages/plugins/custom-definesandincludes/kcm_widget/includesmodel.h
--- a/languages/plugins/custom-definesandincludes/kcm_widget/includesmodel.h
+++ b/languages/plugins/custom-definesandincludes/kcm_widget/includesmodel.h
@@ -26,7 +26,7 @@
 {
 Q_OBJECT
 public:
-    IncludesModel( QObject* parent = 0 );
+    IncludesModel( QObject* parent = nullptr );
     void setIncludes( const QStringList&  );
     QStringList includes() const;
     QVariant data(const QModelIndex& index, int role = Qt::DisplayRole) const override;
diff --git a/languages/plugins/custom-definesandincludes/kcm_widget/includesmodel.cpp b/languages/plugins/custom-definesandincludes/kcm_widget/includesmodel.cpp
--- a/languages/plugins/custom-definesandincludes/kcm_widget/includesmodel.cpp
+++ b/languages/plugins/custom-definesandincludes/kcm_widget/includesmodel.cpp
@@ -60,7 +60,7 @@
 Qt::ItemFlags IncludesModel::flags( const QModelIndex& index ) const
 {
     if( !index.isValid() ) {
-        return 0;
+        return nullptr;
     }
 
     return Qt::ItemFlags( Qt::ItemIsEditable | Qt::ItemIsSelectable | Qt::ItemIsEnabled );
diff --git a/languages/plugins/custom-definesandincludes/kcm_widget/includeswidget.h b/languages/plugins/custom-definesandincludes/kcm_widget/includeswidget.h
--- a/languages/plugins/custom-definesandincludes/kcm_widget/includeswidget.h
+++ b/languages/plugins/custom-definesandincludes/kcm_widget/includeswidget.h
@@ -42,7 +42,7 @@
 {
 Q_OBJECT
 public:
-    IncludesWidget( QWidget* parent = 0 );
+    IncludesWidget( QWidget* parent = nullptr );
     void setProject(KDevelop::IProject* w_project);
     void setIncludes( const QStringList& );
     void clear();
diff --git a/languages/plugins/custom-definesandincludes/kcm_widget/projectpathsmodel.h b/languages/plugins/custom-definesandincludes/kcm_widget/projectpathsmodel.h
--- a/languages/plugins/custom-definesandincludes/kcm_widget/projectpathsmodel.h
+++ b/languages/plugins/custom-definesandincludes/kcm_widget/projectpathsmodel.h
@@ -42,7 +42,7 @@
         CompilerDataRole = Qt::UserRole + 4,
         ParserArgumentsRole = Qt::UserRole + 5
     };
-    ProjectPathsModel( QObject* parent = 0 );
+    ProjectPathsModel( QObject* parent = nullptr );
     void setProject( KDevelop::IProject* w_project );
     void setPaths( const QList< ConfigEntry >& paths );
     void addPath( const QUrl &url );
diff --git a/languages/plugins/custom-definesandincludes/kcm_widget/projectpathsmodel.cpp b/languages/plugins/custom-definesandincludes/kcm_widget/projectpathsmodel.cpp
--- a/languages/plugins/custom-definesandincludes/kcm_widget/projectpathsmodel.cpp
+++ b/languages/plugins/custom-definesandincludes/kcm_widget/projectpathsmodel.cpp
@@ -26,7 +26,7 @@
 using namespace KDevelop;
 
 ProjectPathsModel::ProjectPathsModel( QObject* parent )
-    : QAbstractListModel( parent ), project( 0 )
+    : QAbstractListModel( parent ), project( nullptr )
 {
 }
 
@@ -135,7 +135,7 @@
 Qt::ItemFlags ProjectPathsModel::flags( const QModelIndex& index ) const
 {
     if( !index.isValid() ) {
-        return 0;
+        return nullptr;
     }
 
     if( index.row() == 0 ) {
diff --git a/languages/plugins/custom-definesandincludes/kcm_widget/projectpathswidget.h b/languages/plugins/custom-definesandincludes/kcm_widget/projectpathswidget.h
--- a/languages/plugins/custom-definesandincludes/kcm_widget/projectpathswidget.h
+++ b/languages/plugins/custom-definesandincludes/kcm_widget/projectpathswidget.h
@@ -44,7 +44,7 @@
 {
 Q_OBJECT
 public:
-    ProjectPathsWidget( QWidget* parent = 0 );
+    ProjectPathsWidget( QWidget* parent = nullptr );
     void setProject(KDevelop::IProject* w_project);
     void setPaths( const QList<ConfigEntry>& );
     QList<ConfigEntry> paths() const;
diff --git a/languages/plugins/custom-definesandincludes/noprojectincludesanddefines/noprojectcustomincludepaths.h b/languages/plugins/custom-definesandincludes/noprojectincludesanddefines/noprojectcustomincludepaths.h
--- a/languages/plugins/custom-definesandincludes/noprojectincludesanddefines/noprojectcustomincludepaths.h
+++ b/languages/plugins/custom-definesandincludes/noprojectincludesanddefines/noprojectcustomincludepaths.h
@@ -35,7 +35,7 @@
     Q_OBJECT
 
 public:
-    NoProjectCustomIncludePaths( QWidget* parent = 0 );
+    NoProjectCustomIncludePaths( QWidget* parent = nullptr );
 
     void setStorageDirectory( const QString& path );
     QString storageDirectory() const;
diff --git a/languages/plugins/custom-definesandincludes/tests/test_definesandincludes.cpp b/languages/plugins/custom-definesandincludes/tests/test_definesandincludes.cpp
--- a/languages/plugins/custom-definesandincludes/tests/test_definesandincludes.cpp
+++ b/languages/plugins/custom-definesandincludes/tests/test_definesandincludes.cpp
@@ -93,7 +93,7 @@
     QCOMPARE( manager->defines( s_currentProject->projectItem(), IDefinesAndIncludesManager::UserDefined ), defines );
     QVERIFY(!manager->parserArguments(s_currentProject->projectItem()).isEmpty());
 
-    ProjectBaseItem* mainfile = 0;
+    ProjectBaseItem* mainfile = nullptr;
     for (const auto& file: s_currentProject->fileSet() ) {
         for (auto i: s_currentProject->filesForPath(file)) {
             if( i->text() == "main.cpp" ) {
diff --git a/projectbuilders/cmakebuilder/cmakebuilder.h b/projectbuilders/cmakebuilder/cmakebuilder.h
--- a/projectbuilders/cmakebuilder/cmakebuilder.h
+++ b/projectbuilders/cmakebuilder/cmakebuilder.h
@@ -47,7 +47,7 @@
     Q_INTERFACES( KDevelop::IProjectBuilder )
 
 public:
-    explicit CMakeBuilder(QObject *parent = 0, const QVariantList &args = QVariantList());
+    explicit CMakeBuilder(QObject *parent = nullptr, const QVariantList &args = QVariantList());
     ~CMakeBuilder() override;
 
     KJob* build(KDevelop::ProjectBaseItem *dom) override;
diff --git a/projectbuilders/cmakebuilder/cmakebuilder.cpp b/projectbuilders/cmakebuilder/cmakebuilder.cpp
--- a/projectbuilders/cmakebuilder/cmakebuilder.cpp
+++ b/projectbuilders/cmakebuilder/cmakebuilder.cpp
@@ -118,7 +118,7 @@
         bool valid;
         KJob* configure = checkConfigureJob(dom->project(), valid);
 
-        KJob* build = 0;
+        KJob* build = nullptr;
         if(dom->file())
         {
             IMakeBuilder* makeBuilder = dynamic_cast<IMakeBuilder*>(builder);
diff --git a/projectbuilders/cmakebuilder/cmakejob.h b/projectbuilders/cmakebuilder/cmakejob.h
--- a/projectbuilders/cmakebuilder/cmakejob.h
+++ b/projectbuilders/cmakebuilder/cmakejob.h
@@ -45,7 +45,7 @@
         FailedError
     };
 
-    CMakeJob(QObject* parent = 0);
+    CMakeJob(QObject* parent = nullptr);
     
     void setProject(KDevelop::IProject* project);
 
diff --git a/projectbuilders/cmakebuilder/cmakejob.cpp b/projectbuilders/cmakebuilder/cmakejob.cpp
--- a/projectbuilders/cmakebuilder/cmakejob.cpp
+++ b/projectbuilders/cmakebuilder/cmakejob.cpp
@@ -43,7 +43,7 @@
 
 CMakeJob::CMakeJob(QObject* parent)
     : OutputExecuteJob(parent)
-    , m_project(0)
+    , m_project(nullptr)
 {
     setCapabilities( Killable );
     setFilteringStrategy( OutputModel::CompilerFilter );
diff --git a/projectbuilders/cmakebuilder/prunejob.cpp b/projectbuilders/cmakebuilder/prunejob.cpp
--- a/projectbuilders/cmakebuilder/prunejob.cpp
+++ b/projectbuilders/cmakebuilder/prunejob.cpp
@@ -31,7 +31,7 @@
 PruneJob::PruneJob(KDevelop::IProject* project)
     : OutputJob(project, Verbose)
     , m_project(project)
-    , m_job(0)
+    , m_job(nullptr)
 {
     setCapabilities( Killable );
     setToolTitle( i18n("CMake") );
@@ -84,5 +84,5 @@
     else
         output->appendLine(i18n("** Prune failed: %1 **", job->errorString()));
     emitResult();
-    m_job = 0;
+    m_job = nullptr;
 }
diff --git a/projectbuilders/makebuilder/makebuilder.h b/projectbuilders/makebuilder/makebuilder.h
--- a/projectbuilders/makebuilder/makebuilder.h
+++ b/projectbuilders/makebuilder/makebuilder.h
@@ -45,7 +45,7 @@
     Q_INTERFACES( IMakeBuilder )
     Q_INTERFACES( KDevelop::IProjectBuilder )
 public:
-    explicit MakeBuilder(QObject *parent = 0, const QVariantList &args = QVariantList());
+    explicit MakeBuilder(QObject *parent = nullptr, const QVariantList &args = QVariantList());
     ~MakeBuilder() override;
 
     /**
diff --git a/projectbuilders/makebuilder/makebuilderpreferences.h b/projectbuilders/makebuilder/makebuilderpreferences.h
--- a/projectbuilders/makebuilder/makebuilderpreferences.h
+++ b/projectbuilders/makebuilder/makebuilderpreferences.h
@@ -34,7 +34,7 @@
     Q_OBJECT
 
 public:
-    explicit MakeBuilderPreferences(KDevelop::IPlugin* plugin, const KDevelop::ProjectConfigOptions& options, QWidget* parent = 0);
+    explicit MakeBuilderPreferences(KDevelop::IPlugin* plugin, const KDevelop::ProjectConfigOptions& options, QWidget* parent = nullptr);
     ~MakeBuilderPreferences() override;
     void reset() override;
     void apply() override;
diff --git a/projectbuilders/ninjabuilder/kdevninjabuilderplugin.h b/projectbuilders/ninjabuilder/kdevninjabuilderplugin.h
--- a/projectbuilders/ninjabuilder/kdevninjabuilderplugin.h
+++ b/projectbuilders/ninjabuilder/kdevninjabuilderplugin.h
@@ -32,7 +32,7 @@
     Q_OBJECT
     Q_INTERFACES( KDevelop::IProjectBuilder )
     public:
-        KDevNinjaBuilderPlugin(QObject* parent = 0, const QVariantList& args = QVariantList());
+        KDevNinjaBuilderPlugin(QObject* parent = nullptr, const QVariantList& args = QVariantList());
         
         KJob* build(KDevelop::ProjectBaseItem* item) override;
         KJob* clean(KDevelop::ProjectBaseItem* item) override;
diff --git a/projectbuilders/ninjabuilder/kdevninjabuilderplugin.cpp b/projectbuilders/ninjabuilder/kdevninjabuilderplugin.cpp
--- a/projectbuilders/ninjabuilder/kdevninjabuilderplugin.cpp
+++ b/projectbuilders/ninjabuilder/kdevninjabuilderplugin.cpp
@@ -64,7 +64,7 @@
         if (!targets.isEmpty()) {
             return targets;
         }
-        current = (current->parent() ? current->parent()->folder() : 0);
+        current = (current->parent() ? current->parent()->folder() : nullptr);
     }
     return QStringList();
 }
diff --git a/projectbuilders/ninjabuilder/ninjabuilderpreferences.h b/projectbuilders/ninjabuilder/ninjabuilderpreferences.h
--- a/projectbuilders/ninjabuilder/ninjabuilderpreferences.h
+++ b/projectbuilders/ninjabuilder/ninjabuilderpreferences.h
@@ -34,7 +34,7 @@
     Q_OBJECT
 
 public:
-    explicit NinjaBuilderPreferences(KDevelop::IPlugin* plugin, const KDevelop::ProjectConfigOptions& options, QWidget* parent = 0);
+    explicit NinjaBuilderPreferences(KDevelop::IPlugin* plugin, const KDevelop::ProjectConfigOptions& options, QWidget* parent = nullptr);
     ~NinjaBuilderPreferences() override;
 
     QString name() const override;
diff --git a/projectmanagers/cmake/cmakebuilddirchooser.h b/projectmanagers/cmake/cmakebuilddirchooser.h
--- a/projectmanagers/cmake/cmakebuilddirchooser.h
+++ b/projectmanagers/cmake/cmakebuilddirchooser.h
@@ -49,7 +49,7 @@
         };
         Q_DECLARE_FLAGS( StatusTypes, StatusType )
 
-        explicit CMakeBuildDirChooser(QWidget* parent = 0);
+        explicit CMakeBuildDirChooser(QWidget* parent = nullptr);
         ~CMakeBuildDirChooser() override;
 
         KDevelop::Path cmakeBinary() const;
diff --git a/projectmanagers/cmake/cmakedocumentation.h b/projectmanagers/cmake/cmakedocumentation.h
--- a/projectmanagers/cmake/cmakedocumentation.h
+++ b/projectmanagers/cmake/cmakedocumentation.h
@@ -39,7 +39,7 @@
     Q_INTERFACES( ICMakeDocumentation )
     Q_INTERFACES( KDevelop::IDocumentationProvider )
     public:
-        explicit CMakeDocumentation( QObject* parent = 0, const QVariantList& args = QVariantList() );
+        explicit CMakeDocumentation( QObject* parent = nullptr, const QVariantList& args = QVariantList() );
 
         KDevelop::IDocumentation::Ptr description(const QString& identifier, const QUrl &file) const override;
         KDevelop::IDocumentation::Ptr documentationForDeclaration(KDevelop::Declaration* declaration) const override;
diff --git a/projectmanagers/cmake/cmakedocumentation.cpp b/projectmanagers/cmake/cmakedocumentation.cpp
--- a/projectmanagers/cmake/cmakedocumentation.cpp
+++ b/projectmanagers/cmake/cmakedocumentation.cpp
@@ -45,7 +45,7 @@
 
 K_PLUGIN_FACTORY_WITH_JSON(CMakeSupportDocFactory, "kdevcmakedocumentation.json", registerPlugin<CMakeDocumentation>(); )
 
-CMakeDocumentation* CMakeDoc::s_provider=0;
+CMakeDocumentation* CMakeDoc::s_provider=nullptr;
 KDevelop::IDocumentationProvider* CMakeDoc::provider() const { return s_provider; }
 
 CMakeDocumentation::CMakeDocumentation(QObject* parent, const QVariantList&)
@@ -66,7 +66,7 @@
     initializeModel();
 }
 
-static const char* args[] = { "--help-command", "--help-variable", "--help-module", "--help-property", 0, 0 };
+static const char* args[] = { "--help-command", "--help-variable", "--help-module", "--help-property", nullptr, nullptr };
 
 void CMakeDocumentation::delayedInitialization()
 {
@@ -135,7 +135,7 @@
     }
 
     KDevelop::IProject* p=KDevelop::ICore::self()->projectController()->findProjectForUrl(file);
-    ICMakeManager* m=0;
+    ICMakeManager* m=nullptr;
     if(p)
         m=p->managerPlugin()->extension<ICMakeManager>();
     if(m)
diff --git a/projectmanagers/cmake/cmakehelpdocumentation.h b/projectmanagers/cmake/cmakehelpdocumentation.h
--- a/projectmanagers/cmake/cmakehelpdocumentation.h
+++ b/projectmanagers/cmake/cmakehelpdocumentation.h
@@ -47,7 +47,7 @@
         QString name() const override;
         QString description() const override { return name(); }
 
-        QWidget* documentationWidget ( KDevelop::DocumentationFindWidget* findWidget, QWidget* parent = 0 ) override;
+        QWidget* documentationWidget ( KDevelop::DocumentationFindWidget* findWidget, QWidget* parent = nullptr ) override;
 };
 
 #endif
diff --git a/projectmanagers/cmake/cmakemanager.h b/projectmanagers/cmake/cmakemanager.h
--- a/projectmanagers/cmake/cmakemanager.h
+++ b/projectmanagers/cmake/cmakemanager.h
@@ -77,7 +77,7 @@
 Q_INTERFACES( KDevelop::ILanguageSupport )
 Q_INTERFACES( ICMakeManager )
 public:
-    explicit CMakeManager( QObject* parent = 0, const QVariantList& args = QVariantList() );
+    explicit CMakeManager( QObject* parent = nullptr, const QVariantList& args = QVariantList() );
 
     ~CMakeManager() override;
 
@@ -89,7 +89,7 @@
     KDevelop::Path::List frameworkDirectories(KDevelop::ProjectBaseItem *item) const override;
     QHash<QString, QString> defines(KDevelop::ProjectBaseItem *) const override;
 
-    KDevelop::ProjectTargetItem* createTarget( const QString&, KDevelop::ProjectFolderItem* ) override { return 0; }
+    KDevelop::ProjectTargetItem* createTarget( const QString&, KDevelop::ProjectFolderItem* ) override { return nullptr; }
 
     virtual QList<KDevelop::ProjectTargetItem*> targets() const;
     QList<KDevelop::ProjectTargetItem*> targets(KDevelop::ProjectFolderItem* folder) const override;
@@ -116,7 +116,7 @@
 //     virtual KDevelop::ContextMenuExtension contextMenuExtension( KDevelop::Context* context );
 
 
-    KDevelop::ProjectFolderItem* createFolderItem(KDevelop::IProject* project, const KDevelop::Path& path, KDevelop::ProjectBaseItem* parent = 0) override;
+    KDevelop::ProjectFolderItem* createFolderItem(KDevelop::IProject* project, const KDevelop::Path& path, KDevelop::ProjectBaseItem* parent = nullptr) override;
     QPair<QString, QString> cacheValue(KDevelop::IProject* project, const QString& id) const override;
     
     //LanguageSupport
diff --git a/projectmanagers/cmake/cmakemanager.cpp b/projectmanagers/cmake/cmakemanager.cpp
--- a/projectmanagers/cmake/cmakemanager.cpp
+++ b/projectmanagers/cmake/cmakemanager.cpp
@@ -718,7 +718,7 @@
 QWidget* CMakeManager::specialLanguageObjectNavigationWidget(const QUrl &url, const KTextEditor::Cursor& position)
 {
     KDevelop::TopDUContextPointer top= TopDUContextPointer(KDevelop::DUChain::self()->chainForDocument(url));
-    Declaration *decl=0;
+    Declaration *decl=nullptr;
     if(top)
     {
         int useAt=top->findUseAt(top->transformToLocalRevision(position));
@@ -729,7 +729,7 @@
         }
     }
 
-    CMakeNavigationWidget* doc=0;
+    CMakeNavigationWidget* doc=nullptr;
     if(decl)
     {
         doc=new CMakeNavigationWidget(top, decl);
diff --git a/projectmanagers/cmake/cmakenavigationwidget.cpp b/projectmanagers/cmake/cmakenavigationwidget.cpp
--- a/projectmanagers/cmake/cmakenavigationwidget.cpp
+++ b/projectmanagers/cmake/cmakenavigationwidget.cpp
@@ -29,7 +29,7 @@
 {
     public:
         CMakeNavigationContext(TopDUContextPointer top, const QString& name, const QString& html)
-            : AbstractNavigationContext(top, 0), mName(name), mDescription(html) {}
+            : AbstractNavigationContext(top, nullptr), mName(name), mDescription(html) {}
         QString name() const override { return mName; }
         QString html(bool shorten = false) override
         {
diff --git a/projectmanagers/cmake/duchain/contextbuilder.cpp b/projectmanagers/cmake/duchain/contextbuilder.cpp
--- a/projectmanagers/cmake/duchain/contextbuilder.cpp
+++ b/projectmanagers/cmake/duchain/contextbuilder.cpp
@@ -25,7 +25,7 @@
 
 KDevelop::DUContext* ContextBuilder::contextFromNode(CMakeContentIterator* /*node*/)
 {
-    return 0;
+    return nullptr;
 }
 
 KDevelop::RangeInRevision ContextBuilder::editorFindRange(CMakeContentIterator* /*fromNode*/, CMakeContentIterator* /*toNode*/)
diff --git a/projectmanagers/cmake/parser/cmakeduchaintypes.cpp b/projectmanagers/cmake/parser/cmakeduchaintypes.cpp
--- a/projectmanagers/cmake/parser/cmakeduchaintypes.cpp
+++ b/projectmanagers/cmake/parser/cmakeduchaintypes.cpp
@@ -47,5 +47,5 @@
 
 bool TargetType::equals(const KDevelop::AbstractType* rhs) const
 {
-    return dynamic_cast<const TargetType*>(rhs)!=0;
+    return dynamic_cast<const TargetType*>(rhs)!=nullptr;
 }
diff --git a/projectmanagers/cmake/settings/cmakecachedelegate.cpp b/projectmanagers/cmake/settings/cmakecachedelegate.cpp
--- a/projectmanagers/cmake/settings/cmakecachedelegate.cpp
+++ b/projectmanagers/cmake/settings/cmakecachedelegate.cpp
@@ -40,7 +40,7 @@
 
 QWidget * CMakeCacheDelegate::createEditor(QWidget * parent, const QStyleOptionViewItem & option, const QModelIndex & index) const
 {
-    QWidget *ret=0;
+    QWidget *ret=nullptr;
     if(index.column()==2)
     {
         QModelIndex typeIdx=index.sibling(index.row(), 1);
diff --git a/projectmanagers/cmake/settings/cmakecachemodel.cpp b/projectmanagers/cmake/settings/cmakecachemodel.cpp
--- a/projectmanagers/cmake/settings/cmakecachemodel.cpp
+++ b/projectmanagers/cmake/settings/cmakecachemodel.cpp
@@ -178,7 +178,7 @@
 bool CMakeCacheModel::isAdvanced(int i) const
 {
     QStandardItem *p=item(i, 4);
-    bool isAdv= (p!=0) || i>m_internalBegin;
+    bool isAdv= (p!=nullptr) || i>m_internalBegin;
     if(!isAdv)
     {
         p=item(i, 1);
diff --git a/projectmanagers/cmake/settings/cmakepreferences.h b/projectmanagers/cmake/settings/cmakepreferences.h
--- a/projectmanagers/cmake/settings/cmakepreferences.h
+++ b/projectmanagers/cmake/settings/cmakepreferences.h
@@ -40,7 +40,7 @@
 {
     Q_OBJECT
     public:
-        explicit CMakePreferences(KDevelop::IPlugin* plugin, const KDevelop::ProjectConfigOptions& options, QWidget* parent = 0);
+        explicit CMakePreferences(KDevelop::IPlugin* plugin, const KDevelop::ProjectConfigOptions& options, QWidget* parent = nullptr);
         ~CMakePreferences() override;
 
         QString name() const override;
diff --git a/projectmanagers/cmake/settings/cmakepreferences.cpp b/projectmanagers/cmake/settings/cmakepreferences.cpp
--- a/projectmanagers/cmake/settings/cmakepreferences.cpp
+++ b/projectmanagers/cmake/settings/cmakepreferences.cpp
@@ -49,7 +49,7 @@
 using namespace KDevelop;
 
 CMakePreferences::CMakePreferences(IPlugin* plugin, const ProjectConfigOptions& options, QWidget* parent)
-    : ConfigPage(plugin, nullptr, parent), m_project(options.project), m_currentModel(0)
+    : ConfigPage(plugin, nullptr, parent), m_project(options.project), m_currentModel(nullptr)
 {
     QVBoxLayout* l = new QVBoxLayout( this );
     QWidget* w = new QWidget;
@@ -192,10 +192,10 @@
     }
     else
     {
-        disconnect(m_prefsUi->cacheList->selectionModel(), &QItemSelectionModel::currentChanged, this, 0);
+        disconnect(m_prefsUi->cacheList->selectionModel(), &QItemSelectionModel::currentChanged, this, nullptr);
         if (m_currentModel) {
             m_currentModel->deleteLater();
-            m_currentModel = 0;
+            m_currentModel = nullptr;
         }
         configureCacheView();
     }
diff --git a/projectmanagers/cmake/testing/ctestfindjob.h b/projectmanagers/cmake/testing/ctestfindjob.h
--- a/projectmanagers/cmake/testing/ctestfindjob.h
+++ b/projectmanagers/cmake/testing/ctestfindjob.h
@@ -35,7 +35,7 @@
     Q_OBJECT
     
 public:
-    explicit CTestFindJob(CTestSuite* suite, QObject* parent = 0);
+    explicit CTestFindJob(CTestSuite* suite, QObject* parent = nullptr);
     void start() override;
     
 private slots:
diff --git a/projectmanagers/cmake/testing/ctestrunjob.h b/projectmanagers/cmake/testing/ctestrunjob.h
--- a/projectmanagers/cmake/testing/ctestrunjob.h
+++ b/projectmanagers/cmake/testing/ctestrunjob.h
@@ -36,7 +36,7 @@
 {
     Q_OBJECT
 public:
-    CTestRunJob(CTestSuite* suite, const QStringList& cases, KDevelop::OutputJob::OutputJobVerbosity verbosity, bool expectFail, QObject* parent = 0);
+    CTestRunJob(CTestSuite* suite, const QStringList& cases, KDevelop::OutputJob::OutputJobVerbosity verbosity, bool expectFail, QObject* parent = nullptr);
     void start() override;
 
 protected:
diff --git a/projectmanagers/cmake/testing/ctestrunjob.cpp b/projectmanagers/cmake/testing/ctestrunjob.cpp
--- a/projectmanagers/cmake/testing/ctestrunjob.cpp
+++ b/projectmanagers/cmake/testing/ctestrunjob.cpp
@@ -44,8 +44,8 @@
 : KJob(parent)
 , m_suite(suite)
 , m_cases(cases)
-, m_job(0)
-, m_outputJob(0)
+, m_job(nullptr)
+, m_outputJob(nullptr)
 , m_verbosity(verbosity)
 , m_expectFail(expectFail)
 {
@@ -66,7 +66,7 @@
     qCDebug(CMAKE) << "got mode and type:" << type << type->id() << mode << mode->id();
     Q_ASSERT(type && mode);
 
-    ILauncher* launcher = 0;
+    ILauncher* launcher = nullptr;
     foreach (ILauncher *l, type->launchers())
     {
         //qCDebug(CMAKE) << "avaliable launcher" << l << l->id() << l->supportedModes();
@@ -77,7 +77,7 @@
     }
     Q_ASSERT(launcher);
 
-    ILaunchConfiguration* ilaunch = 0;
+    ILaunchConfiguration* ilaunch = nullptr;
     QList<ILaunchConfiguration*> launchConfigurations = ICore::self()->runController()->launchConfigurations();
     foreach (ILaunchConfiguration *l, launchConfigurations) {
         if (l->type() == type && l->config().readEntry("ConfiguredByCTest", false)) {
@@ -88,7 +88,7 @@
     if (!ilaunch) {
         ilaunch = ICore::self()->runController()->createLaunchConfiguration( type,
                                                 qMakePair( mode->id(), launcher->id() ),
-                                                0, //TODO add project
+                                                nullptr, //TODO add project
                                                 i18n("CTest") );
         ilaunch->config().writeEntry("ConfiguredByCTest", true);
         //qCDebug(CMAKE) << "created config, launching";
diff --git a/projectmanagers/cmake/testing/ctestsuite.cpp b/projectmanagers/cmake/testing/ctestsuite.cpp
--- a/projectmanagers/cmake/testing/ctestsuite.cpp
+++ b/projectmanagers/cmake/testing/ctestsuite.cpp
@@ -67,7 +67,7 @@
         return;
     }
 
-    Declaration* testClass = 0;
+    Declaration* testClass = nullptr;
     Identifier testCaseIdentifier("tc");
     foreach (Declaration* declaration, topContext->findLocalDeclarations(Identifier("main")))
     {
@@ -181,7 +181,7 @@
 
 IndexedDeclaration CTestSuite::caseDeclaration(const QString& testCase) const
 {
-    return m_declarations.value(testCase, IndexedDeclaration(0));
+    return m_declarations.value(testCase, IndexedDeclaration(nullptr));
 }
 
 void CTestSuite::setTestCases(const QStringList& cases)
diff --git a/projectmanagers/cmake/testing/qttestdelegate.h b/projectmanagers/cmake/testing/qttestdelegate.h
--- a/projectmanagers/cmake/testing/qttestdelegate.h
+++ b/projectmanagers/cmake/testing/qttestdelegate.h
@@ -28,7 +28,7 @@
     Q_OBJECT
     
 public:
-    explicit QtTestDelegate(QObject* parent = 0);
+    explicit QtTestDelegate(QObject* parent = nullptr);
     ~QtTestDelegate() override;
     
     void paint(QPainter* painter, const QStyleOptionViewItem& option, const QModelIndex& index) const override;
diff --git a/projectmanagers/cmake/tests/kdevprojectopen.h b/projectmanagers/cmake/tests/kdevprojectopen.h
--- a/projectmanagers/cmake/tests/kdevprojectopen.h
+++ b/projectmanagers/cmake/tests/kdevprojectopen.h
@@ -31,7 +31,7 @@
     Q_OBJECT
 
 public:
-    explicit KDevProjectOpen(QObject* parent = 0);
+    explicit KDevProjectOpen(QObject* parent = nullptr);
     void openProject(const QUrl& path);
     void cleanup();
 private slots:
diff --git a/projectmanagers/custom-buildsystem/configwidget.h b/projectmanagers/custom-buildsystem/configwidget.h
--- a/projectmanagers/custom-buildsystem/configwidget.h
+++ b/projectmanagers/custom-buildsystem/configwidget.h
@@ -38,7 +38,7 @@
 {
 Q_OBJECT
 public:
-    ConfigWidget( QWidget* parent = 0 );
+    ConfigWidget( QWidget* parent = nullptr );
     void loadConfig( CustomBuildSystemConfig cfg );
     CustomBuildSystemConfig config() const;
     void clear();
diff --git a/projectmanagers/custom-buildsystem/custombuildsystemplugin.cpp b/projectmanagers/custom-buildsystem/custombuildsystemplugin.cpp
--- a/projectmanagers/custom-buildsystem/custombuildsystemplugin.cpp
+++ b/projectmanagers/custom-buildsystem/custombuildsystemplugin.cpp
@@ -120,7 +120,7 @@
 
 ProjectTargetItem* CustomBuildSystem::createTarget( const QString&, ProjectFolderItem* )
 {
-    return 0;
+    return nullptr;
 }
 
 QHash<QString, QString> CustomBuildSystem::defines( ProjectBaseItem* ) const
diff --git a/projectmanagers/custom-buildsystem/tests/test_custombuildsystemplugin.cpp b/projectmanagers/custom-buildsystem/tests/test_custombuildsystemplugin.cpp
--- a/projectmanagers/custom-buildsystem/tests/test_custombuildsystemplugin.cpp
+++ b/projectmanagers/custom-buildsystem/tests/test_custombuildsystemplugin.cpp
@@ -96,7 +96,7 @@
     QVERIFY(projectSpy->wait(10000));
     IProject* project = ICore::self()->projectController()->findProjectByName( "MultiPathProject" );
     QVERIFY( project );
-    KDevelop::ProjectBaseItem* mainfile = 0;
+    KDevelop::ProjectBaseItem* mainfile = nullptr;
     for (const auto& file: project->fileSet() ) {
         for (auto i: project->filesForPath(file)) {
             if( i->text() == "main.cpp" ) {
diff --git a/projectmanagers/custommake/custommakemanager.h b/projectmanagers/custommake/custommakemanager.h
--- a/projectmanagers/custommake/custommakemanager.h
+++ b/projectmanagers/custommake/custommakemanager.h
@@ -28,7 +28,7 @@
     Q_INTERFACES( KDevelop::IBuildSystemManager )
 public:
 
-    explicit CustomMakeManager( QObject *parent = NULL, const QVariantList& args = QVariantList()  );
+    explicit CustomMakeManager( QObject *parent = nullptr, const QVariantList& args = QVariantList()  );
 
     ~CustomMakeManager() override;
 
@@ -117,7 +117,7 @@
                                                       KDevelop::ProjectBaseItem* parent) override;
     KDevelop::ProjectFolderItem* createFolderItem(KDevelop::IProject* project,
                                                           const KDevelop::Path& path,
-                                                          KDevelop::ProjectBaseItem* parent = 0) override;
+                                                          KDevelop::ProjectBaseItem* parent = nullptr) override;
 
     void unload() override;
 
diff --git a/projectmanagers/custommake/custommakemanager.cpp b/projectmanagers/custommake/custommakemanager.cpp
--- a/projectmanagers/custommake/custommakemanager.cpp
+++ b/projectmanagers/custommake/custommakemanager.cpp
@@ -165,7 +165,7 @@
 {
     Q_UNUSED(target)
     Q_UNUSED(parent)
-    return NULL;
+    return nullptr;
 }
 
 bool CustomMakeManager::addFilesToTarget(const QList< ProjectFileItem* > &files, ProjectTargetItem* parent)
@@ -271,7 +271,7 @@
     {
         //FIXME turn this into a real warning
         qCWarning(CUSTOMMAKE) << project->path() << "not a local file. Custom make support doesn't handle remote projects";
-        return 0;
+        return nullptr;
     }
 
     {
diff --git a/providers/kdeprovider/kdeprojectsmodel.h b/providers/kdeprovider/kdeprojectsmodel.h
--- a/providers/kdeprovider/kdeprojectsmodel.h
+++ b/providers/kdeprovider/kdeprojectsmodel.h
@@ -62,7 +62,7 @@
         
         enum Role { VcsLocationRole = Qt::UserRole+1, IdentifierRole };
         
-        explicit KDEProjectsModel(QObject* parent = 0);
+        explicit KDEProjectsModel(QObject* parent = nullptr);
 };
 
 #endif // KDEPROJECTSMODEL_H
diff --git a/providers/kdeprovider/kdeproviderwidget.h b/providers/kdeprovider/kdeproviderwidget.h
--- a/providers/kdeprovider/kdeproviderwidget.h
+++ b/providers/kdeprovider/kdeproviderwidget.h
@@ -31,7 +31,7 @@
 {
     Q_OBJECT
     public:
-        KDEProviderWidget(QWidget* parent = 0);
+        KDEProviderWidget(QWidget* parent = nullptr);
         
         KDevelop::VcsJob* createWorkingCopy(const QUrl &destinationDirectory) override;
         bool isCorrect() const override;
diff --git a/providers/kdeprovider/kdeproviderwidget.cpp b/providers/kdeprovider/kdeproviderwidget.cpp
--- a/providers/kdeprovider/kdeproviderwidget.cpp
+++ b/providers/kdeprovider/kdeproviderwidget.cpp
@@ -87,12 +87,12 @@
 {
     QModelIndex pos = m_projects->currentIndex();
     if(!pos.isValid())
-        return 0;
+        return nullptr;
     
     IPlugin* plugin = ICore::self()->pluginController()->pluginForExtension("org.kdevelop.IBasicVersionControl", "kdevgit");
     if (!plugin) {
-        KMessageBox::error(0, i18n("The Git plugin could not be loaded which is required to download a KDE project."), i18n("KDE Provider Error"));
-        return 0;
+        KMessageBox::error(nullptr, i18n("The Git plugin could not be loaded which is required to download a KDE project."), i18n("KDE Provider Error"));
+        return nullptr;
     }
     IBasicVersionControl* vcIface = plugin->extension<IBasicVersionControl>();
     VcsJob* ret = vcIface->createWorkingCopy(extractLocation(pos), destinationDirectory);
diff --git a/providers/kdeprovider/tests/test_kdeprojectsreader.cpp b/providers/kdeprovider/tests/test_kdeprojectsreader.cpp
--- a/providers/kdeprovider/tests/test_kdeprojectsreader.cpp
+++ b/providers/kdeprovider/tests/test_kdeprojectsreader.cpp
@@ -27,7 +27,7 @@
 void TestKDEProjectsReader::testsProperParse()
 {
     KDEProjectsModel m;
-    KDEProjectsReader reader(&m, 0);
+    KDEProjectsReader reader(&m, nullptr);
     
     if(reader.hasErrors())
         qDebug() << "errors:" << reader.errors();
diff --git a/utils/okteta/kastentoolviewwidget.cpp b/utils/okteta/kastentoolviewwidget.cpp
--- a/utils/okteta/kastentoolviewwidget.cpp
+++ b/utils/okteta/kastentoolviewwidget.cpp
@@ -68,7 +68,7 @@
 {
     // TODO: check if own mainWindow
     OktetaView* oktetaView = qobject_cast<OktetaView*>( view );
-    Kasten::ByteArrayView* byteArrayView = oktetaView ? oktetaView->byteArrayView() : 0;
+    Kasten::ByteArrayView* byteArrayView = oktetaView ? oktetaView->byteArrayView() : nullptr;
     mToolView->tool()->setTargetModel( byteArrayView );
 }
 
diff --git a/utils/okteta/oktetadocument.cpp b/utils/okteta/oktetadocument.cpp
--- a/utils/okteta/oktetadocument.cpp
+++ b/utils/okteta/oktetadocument.cpp
@@ -61,7 +61,7 @@
 OktetaDocument::OktetaDocument( const QUrl &url , ICore* core )
   : Sublime::UrlDocument( core->uiController()->controller(), url ),
     IDocument( core ),
-    mByteArrayDocument( 0 )
+    mByteArrayDocument( nullptr )
 {
 }
 
@@ -70,8 +70,8 @@
 // TODO: use fromContentAndUrl(ByteArrayIODevice) if document loaded
 QMimeType OktetaDocument::mimeType() const { return QMimeDatabase().mimeTypeForUrl( url() ); }
 
-KParts::Part* OktetaDocument::partForView( QWidget* ) const { return 0; }
-KTextEditor::Document* OktetaDocument::textDocument() const { return 0; }
+KParts::Part* OktetaDocument::partForView( QWidget* ) const { return nullptr; }
+KTextEditor::Document* OktetaDocument::textDocument() const { return nullptr; }
 KTextEditor::Cursor OktetaDocument::cursorPosition() const { return KTextEditor::Cursor(); }
 
 IDocument::DocumentState OktetaDocument::state() const
@@ -201,7 +201,7 @@
 
 Sublime::View* OktetaDocument::newView( Sublime::Document* document )
 {
-    if( mByteArrayDocument == 0 )
+    if( mByteArrayDocument == nullptr )
     {
         Kasten::ByteArrayRawFileSynchronizerFactory* synchronizerFactory =
             new Kasten::ByteArrayRawFileSynchronizerFactory();
diff --git a/utils/okteta/oktetaview.h b/utils/okteta/oktetaview.h
--- a/utils/okteta/oktetaview.h
+++ b/utils/okteta/oktetaview.h
@@ -49,7 +49,7 @@
     Kasten::ByteArrayView* byteArrayView() const;
 
   protected: // Sublime::View API
-    QWidget* createWidget( QWidget* parent = 0 ) override;
+    QWidget* createWidget( QWidget* parent = nullptr ) override;
 
   protected:
     Kasten::ByteArrayView* mByteArrayView;