std::future::share

 

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future::share

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std::shared_future<T> share();

Transfers the shared state of *this 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.

The behavior is undefined if valid() == false before the call to this function.

Parameters

(none)

Return value

A std::shared_future object containing the shared state previously held by *this

Notes

The implementations are encouraged to detect the case when valid == false before the call and throw a future_error with an error condition of future_errc::no_state.

See also

shared_future (C++11)	waits for a value (possibly referenced by other futures) that is set asynchronously (class template)