mirror of
https://github.com/simonbrunel/qtpromise.git
synced 2025-07-08 02:08:13 +08:00
cc29ef3512
- Fix the wrong lambda format (missing `[]`). - Make consistent argument naming (`error`). - Use `const &` when appropriated.
29 lines
577 B
Markdown
29 lines
577 B
Markdown
---
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title: .fail
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---
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# QPromise::fail
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*Since: 0.1.0*
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```cpp
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QPromise<T>::fail(Function onRejected) -> QPromise<T>
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```
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Shorthand to [`promise.then(nullptr, onRejected)`](then.md) for handling errors in promise chains,
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similar to the native C++ [`catch` statement](http://en.cppreference.com/w/cpp/language/try_catch):
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```cpp
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promise.fail([](const MyException& error) {
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// {...}
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}).fail([](const QException& error) {
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// {...}
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}).fail([](const std::exception& error) {
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// {...}
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}).fail([]() {
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// {...} catch-all
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});
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```
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See also: [`QPromise::then`](then.md)
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