Send feedback Class promise<T> (2.46.0-rc) Stay organized with collections Save and categorize content based on your preferences. Version latestkeyboard_arrow_down Implement ISO/IEC TS 19571:2016promise<T>.
Constructors promise() Creates a promise with an unsatisfied shared state.
promise(std::function< void()>) Creates a promise with an unsatisfied shared state.
Parameter Name Description cancellation_callbackstd::function< void()>
promise(null_promise_t) Creates a promisewithout a shared state.
Parameter Name Description xnull_promise_t
promise(promise &&) Constructs a new promise and transfer any shared state fromrhs.
Parameter Name Description promise &&
promise(promise const &) Parameter Name Description promise const &
Operators operator=(promise &&) Abandons the shared state in*this, if any, and transfers the shared state fromrhs.
Parameter Name Description rhspromise &&
Returns Type Description promise &
operator=(promise const &) Parameter Name Description promise const &
Returns Type Description promise &
Functions swap(promise &) Swaps the shared state in*this withrhs.
Parameter Name Description otherpromise &
Returns Type Description void
get_future() Creates thefuture<T> using the same shared state as*this.
Returns Type Description future< T >
set_value(T) Satisfies the shared state.
Parameter Name Description valueT
Exceptions Type Description std::future_errorwith std::future_errc::promise_already_satisfied if the shared state is already satisfied. std::future_errorwith std::no_state if the promise does not have a shared state.
Returns Type Description void
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Last updated 2025-12-17 UTC.
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