std::shared_future<T> share() noexcept;

Transfers the shared state of *this, if any, to a std::shared_future object. Multiple std::shared_future objects may reference the same shared state, which is not possible with std::future.

After calling share on a std::future, valid() == false.



Return value

A std::shared_future object containing the shared state previously held by *this, if any, constructed as if by std::shared_future<T>(std::move(*this)).


Defect reports

The following behavior-changing defect reports were applied retroactively to previously published C++ standards.

DR Applied to Behavior as published Correct behavior
LWG 2556 C++11 share() requires valid() to be true requirement removed and made noexcept

See also

waits for a value (possibly referenced by other futures) that is set asynchronously
(class template)

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