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35 lines
1.1 KiB
Markdown
35 lines
1.1 KiB
Markdown
---
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title: ::all [static]
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---
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# QPromise::all [static]
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*Since: 0.1.0*
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```
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[static] QPromise<T>::all(Sequence<QPromise<T>> promises) -> QPromise<QVector<T>>
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```
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Returns a `QPromise<QVector<T>>` that fulfills when **all** `promises` of (the same) type `T` have been fulfilled. The `output` value is a vector containing all the values of `promises`, in the same order, i.e., at the respective positions to the original sequence, 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 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 = QPromise<QByteArray>::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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See also: [`qPromiseAll`](../helpers/qpromiseall.md)
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