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Mar 12, 2024an asynchronous operation (created via std::async, std::packaged_task, or std::promise) can provide a std::future object to the creator of that asynchronous operation. Std::future is an object used in multithreaded programming to receive data or an exception from a different thread; Aug 27, 2021checks if the future refers to a shared state.

This is the case only for futures that were not default-constructed or moved from (i.e. Right after calling this function, valid () is false.. Aug 27, 2021if the future is the result of a call to std::async that used lazy evaluation, this function returns immediately without waiting.

Jul 21, 2020a future represents the result of an asynchronous operation, and can have two states: Oct 23, 2023unlike 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. Aug 2, 2020if the future is the result of a call to async that used lazy evaluation, this function returns immediately without waiting.

The behavior is undefined if valid () is false before the call to this.