Mar 12, 2024 · The class template std::future provides a mechanism to access the result of asynchronous operations: An asynchronous operation (created via std::async, std::packaged_task, …

Nov 27, 2023 · future (const future &) = delete; ~future (); future & operator =(const future &) = delete; future & operator =(future &&) noexcept; shared_future <R> share () noexcept; // retrieving the value …

Feb 22, 2024 · The get member function waits (by calling wait ()) until the shared state is ready, then retrieves the value stored in the shared state (if any). Right after calling this function, valid () is false. …

Aug 2, 2020 · wait_until waits for a result to become available. It blocks until specified timeout_time has been reached or the result becomes available, whichever comes first. The return value indicates why …

Oct 23, 2023 · The promise is the "push" end of the promise-future communication channel: the operation that stores a value in the shared state synchronizes-with (as defined in std::memory_order) …

Aug 27, 2021 · Blocks until the result becomes available. valid() == true after the call. The behavior is undefined if valid() == false before the call to this function.

Oct 22, 2023 · 2) Move constructor. Constructs a std::future with the shared state of other using move semantics. After construction, other.valid() == false.

Jul 8, 2025 · 1. If a future's task has not already started then cancelling the future will prevent the task from ever starting, regardless of whether true or false was passed to cancel. 2. Cancelling an already …

Mar 25, 2025 · In this case it does work. In general, it probably doesn't. I'm wondering how this break in backwards compatibility should in general be navigated. Perhaps installing a previous version of …

Oct 23, 2023 · 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 …