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38 lines
1.1 KiB
Markdown
38 lines
1.1 KiB
Markdown
---
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title: all
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---
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# QtPromise::all
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*Since: 0.5.0*
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```cpp
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QtPromise::all(Sequence<QPromise<T>> promises) -> QPromise<QVector<T>>
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QtPromise::all(Sequence<QPromise<void>> promises) -> QPromise<void>
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```
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Returns a `QPromise<QVector<T>>` (or `QPromise<void>`) that fulfills when **all** `promises` of
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(the same) type `T` have been fulfilled. The `output` value is a vector containing all the values
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of `promises`, in the same order, i.e., at the respective positions to the original sequence,
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regardless of completion order.
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If any of the given `promises` fail, `output` immediately rejects with the error of the promise that
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rejected, whether or not the other promises are resolved.
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`Sequence` is any STL compatible container (eg. `QVector`, `QList`, `std::vector`, etc.)
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```cpp
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QVector<QPromise<QByteArray> > promises{
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download(QUrl("http://a...")),
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download(QUrl("http://b...")),
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download(QUrl("http://c..."))
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};
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auto output = QtPromise::all(promises);
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// output type: QPromise<QVector<QByteArray>>
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output.then([](const QVector<QByteArray>& res) {
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// {...}
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});
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```
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