std::experimental::promise (concurrency TS)

From cppreference.com

This page is about the modified version of std::promise provided by the concurrency TS supporting the std::future improvements made by that TS. For the version of promise with type-erased allocator support provided by the Library Fundamentals TSes, see std::experimental::fundamentals_v2::promise.

Defined in header <experimental/future>
template< class R > class promise;
(1) (concurrency TS)
template< class R > class promise<R&>;
(2) (concurrency TS)
template<> class promise<void>;
(3) (concurrency TS)

std::experimental::concurrency_v1::promise is a modified version of std::promise provided by the concurrency TS that works with std::experimental::future.

The only change from std::promise is that the get_future() member function returns a std::experimental::future.