Differential D18758 Diff 58398 kdevplatform/3rdparty/qtpromise/qtpromise-0.5.0/docs/qtpromise/qpromise/fail.md

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		1		---
		2		title: .fail
		3		---
		4
		5		# QPromise::fail
		6
		7		Since: 0.1.0
		8
		9		```cpp
		10		QPromise<T>::fail(Function onRejected) -> QPromise<T>
		11		```
		12
		13		Shorthand to `promise.then(nullptr, onRejected)`, similar to the [`catch` statement](http://en.cppreference.com/w/cpp/language/try_catch):
		14
		15		```cpp
		16		promise.fail([](const MyException&) {
		17		// {...}
		18		}).fail(const QException&) {
		19		// {...}
		20		}).fail(const std::exception&) {
		21		// {...}
		22		}).fail() {
		23		// {...} catch-all
		24		});
		25		```