Files
qtpromise/docs/qtpromise/helpers/all.md
Simon Brunel 3c1461b8d0 Enhance the documentation and add markdown lint
- Add npm package.json to make easier maintaining dependencies.
- Make markdown files consistent using remark.
- Wrap markdown lines to 100 characters.
- Better README.md layout and visual.
- Enable VuePress landing/home page.
- Upgrade to latest VuePress version.
- Add link to the new Qt Marketplace.
2019-12-21 10:27:26 +01:00

38 lines
1.1 KiB
Markdown

---
title: all
---
# QtPromise::all
*Since: 0.5.0*
```cpp
QtPromise::all(Sequence<QPromise<T>> promises) -> QPromise<QVector<T>>
QtPromise::all(Sequence<QPromise<void>> promises) -> QPromise<void>
```
Returns a `QPromise<QVector<T>>` (or `QPromise<void>`) 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.
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.
`Sequence` is any STL compatible container (eg. `QVector`, `QList`, `std::vector`, etc.)
```cpp
QVector<QPromise<QByteArray> > promises{
download(QUrl("http://a...")),
download(QUrl("http://b...")),
download(QUrl("http://c..."))
};
auto output = QtPromise::all(promises);
// output type: QPromise<QVector<QByteArray>>
output.then([](const QVector<QByteArray>& res) {
// {...}
});
```