- Qt 6.6
- Qt Core
- Obsolete Members for QtFuture
- Qt 6.6.3 Reference Documentation

# Obsolete Members for QtFuture

The following members of class QtFuture are deprecated. They are provided to keep old source code working. We strongly advise against using them in new code.

## Functions

`(deprecated (6.6))` QFuture<std::decay_t<T>> | makeReadyFuture(T &&value)
`(deprecated (6.6))` QFuture<T> | makeReadyFuture(const QList<T> &values)
`(deprecated (6.6))` QFuture<void> | makeReadyFuture()

## Function Documentation

### `[since 6.1]` template <typename T, typename> QFuture<std::decay_t<T>> QtFuture::makeReadyFuture(T &&value)

This function is deprecated since 6.6. We strongly advise against using it in new code.

This is an overloaded function.

Use makeReadyValueFuture() instead.

Creates and returns a QFuture which already has a result value. The returned QFuture has a type of std::decay_t<T>, where T is not void.

     auto f = QtFuture::makeReadyFuture(std::make_unique<int>(42));
     ...
     const int result = *f.takeResult(); // result == 42

The method should be avoided because it has an inconsistent set of overloads. From Qt 6.10 onwards, using it in code will result in compiler warnings.

This function was introduced in Qt 6.1.

See also QFuture, QtFuture::makeReadyVoidFuture(), QtFuture::makeReadyValueFuture(), QtFuture::makeReadyRangeFuture(), and QtFuture::makeExceptionalFuture().

### `[since 6.1]` template <typename T> QFuture<T> QtFuture::makeReadyFuture(const QList<T> &values)

This function is deprecated since 6.6. We strongly advise against using it in new code.

This is an overloaded function.

Use makeReadyRangeFuture() instead.

Creates and returns a QFuture which already has multiple results set from values.

     const QList<int> values { 1, 2, 3 };
     auto f = QtFuture::makeReadyFuture(values);
     ...
     const int count = f.resultCount(); // count == 3
     const auto results = f.results(); // results == { 1, 2, 3 }

The method should be avoided because it has an inconsistent set of overloads. From Qt 6.10 onwards, using it in code will result in compiler warnings.

This function was introduced in Qt 6.1.

See also QFuture, QtFuture::makeReadyVoidFuture(), QtFuture::makeReadyValueFuture(), QtFuture::makeReadyRangeFuture(), and QtFuture::makeExceptionalFuture().

### `[since 6.1]` QFuture<void> QtFuture::makeReadyFuture()

This function is deprecated since 6.6. We strongly advise against using it in new code.

This is an overloaded function.

Use makeReadyVoidFuture() instead.

Creates and returns a void QFuture. Such QFuture can't store any result. One can use it to query the state of the computation. The returned QFuture will always be in the finished state.

     auto f = QtFuture::makeReadyFuture();
     ...
     const bool started = f.isStarted(); // started == true
     const bool running = f.isRunning(); // running == false
     const bool finished = f.isFinished(); // finished == true

The method should be avoided because it has an inconsistent set of overloads. From Qt 6.10 onwards, using it in code will result in compiler warnings.

This function was introduced in Qt 6.1.

See also QFuture, QFuture::isStarted(), QFuture::isRunning(), QFuture::isFinished(), QtFuture::makeReadyVoidFuture(), QtFuture::makeReadyValueFuture(), QtFuture::makeReadyRangeFuture(), and QtFuture::makeExceptionalFuture().