Future city scale, Constants Mar 6, 2020 · impl<F> Future for Box<F> where F: Unpin + Future + ?Sized, Boxed futures only implement the Future trait when the future inside the Box implements Unpin. make_future_dataframe method creates a dataset future where the only column is the ds date column. 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 /* see description */ get (); // functions to check state bool valid () const noexcept; void wait () const; template<class Rep, class Period> 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) the successful return from any function that is waiting on the shared state (such as std::future::get). Since your function doesn't guarantee that the returned future implements Unpin, your return value will be considered to not implement Future. The behavior is undefined if valid () is false before Mar 19, 2025 · Specifies state of a future as returned by wait_for and wait_until functions of std::future and std::shared_future. If the future is the result of a call to async that used lazy evaluation, this function returns immediately without waiting. If valid () is false before the call to this function, the behavior is undefined. Dec 28, 2021 · In summary: std::future is an object used in multithreaded programming to receive data or an exception from a different thread; it is one end of a single-use, one-way communication channel between two threads, std::promise object being the other end. The return value indicates why wait_until returned. 13 reaches its end-of-life.


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