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Class promise<T> (2.31.0) | C++ Client Libraries

Class promise<T> (2.31.0)

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Implement ISO/IEC TS 19571:2016 promise<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_callback std::function< void()>
promise(null_promise_t)

Creates a promise without a shared state.

Parameter Name Description x null_promise_t
promise(promise &&)

Constructs a new promise and transfer any shared state from rhs.

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 from rhs.

Parameter Name Description rhs promise &&
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 with rhs.

Parameter Name Description other promise &
Returns Type Description void get_future()

Creates the future<T> using the same shared state as *this.

Returns Type Description future< T > set_value(T)

Satisfies the shared state.

Parameter Name Description value T
Exceptions Type Description 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

Except as otherwise noted, the content of this page is licensed under the Creative Commons Attribution 4.0 License, and code samples are licensed under the Apache 2.0 License. For details, see the Google Developers Site Policies. Java is a registered trademark of Oracle and/or its affiliates.

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 documentation provides a reference for the `promise` class in C++, detailing its implementation according to ISO/IEC TS 19571:2016."],["The `promise` class supports creating promises with or without a shared state, including constructors for both scenarios, along with a constructor that takes a callback."],["Key operations for the `promise` class include `swap`, `get_future`, and `set_value`, with the `set_value` function potentially throwing `std::future_error` exceptions under certain conditions."],["The documentation contains a list of multiple versions of the class, from 2.10.1 to the latest release candidate 2.37.0-rc."],["Shared states can be transferred between promise objects through the use of move constructors and move assignment operators."]]],[]]

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