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Implement ISO/IEC TS 19571:2016 promise<T>.
Creates a promise with an unsatisfied shared state.
promise(std::function< void()>)Creates a promise with an unsatisfied shared state.
Parameter Name Descriptioncancellation_callback std::function< void()>
Creates a promise without a shared state.
Parameter Name Descriptionx null_promise_t
Constructs a new promise and transfer any shared state from rhs.
promise &&
promise const &
Abandons the shared state in *this, if any, and transfers the shared state from rhs.
rhs promise &&
promise & operator=(promise const &) Parameter Name Description promise const &
promise & Functions swap(promise &)
Swaps the shared state in *this with rhs.
other promise &
void get_future()
Creates the future<T> using the same shared state as *this.
future< T > set_value(T)
Satisfies the shared state.
Parameter Name Descriptionvalue T
std::future_error with std::future_errc::promise_already_satisfied if the shared state is already satisfied. std::future_error with std::no_state if the promise does not have a shared state. Returns Type Description void
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Last updated 2025-08-14 UTC.
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Hard to understand","hardToUnderstand","thumb-down"],["Incorrect information or sample code","incorrectInformationOrSampleCode","thumb-down"],["Missing the information/samples I need","missingTheInformationSamplesINeed","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-14 UTC."],[[["This page details the `promise\u003cT\u003e` implementation, adhering to ISO/IEC TS 19571:2016."],["The latest version available is `2.37.0-rc`, with multiple prior versions listed, including `2.24.0` from which this documentation was derived from."],["`promise\u003cT\u003e` objects can be constructed with or without a shared state, and there are several constructors to create a promise, including a null version, move, and copy constructors."],["The documentation covers various operators, including move and copy assignment operators, and functions such as `swap`, `get_future`, and `set_value`."],["`set_value(T)` can throw `std::future_error` with `std::future_errc::promise_already_satisfied` if the shared state is already satisfied, or with `std::no_state` if the promise does not have a shared state."]]],[]]
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