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std::promise - cppreference. com The class template std::promise provides a facility to store a value or an exception that is later acquired asynchronously via a std::future object created by the std::promise object Note that the std::promise object is meant to be used only once Each promise is associated with a shared state, which contains some state information and a result which may be not yet evaluated, evaluated to a
Execution control library (since C++26) - cppreference. com The Execution control library provides a framework for managing asynchronous execution on generic execution resources The library aims to provide vocabulary types for asynchronous operations and to allow the construction of task execution graphs in a simple, composable way
std::shared_future - cppreference. com The class template std::shared_future provides a mechanism to access the result of asynchronous operations, similar to std::future, except that multiple threads are allowed to wait for the same shared state Unlike std::future, which is only moveable (so only one instance can refer to any particular asynchronous result), std::shared_future is copyable and multiple shared future objects may
std::future lt;T gt;::~future - cppreference. com These actions will not block for the shared state to become ready, except that they may block if all following conditions are satisfied: The shared state was created by a call to std::async The shared state is not yet ready The current object was the last reference to the shared state (since C++14)