Future space weapons. 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, or std::promise) can provide a std::future object to the creator of that asynchronous operation. 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). The behavior is undefined if valid() == false before the call to this function. valid() == true after the call. If valid () is false before the call to this function, the behavior is undefined. The behavior is undefined if valid () is false before the call to this function, or Clock does not meet the Clock requirements. 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 may refer to the same shared state. The solution from Oct 22, 2023 · 2) Move constructor. Constructs a std::future with the shared state of other using move semantics. 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 C++20) 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> Aug 27, 2021 · Blocks until the result becomes available. You'll not able to await it because your type is basically not a Future. After construction, other. The creator of the asynchronous operation can then use a variety of methods to query, wait for, or extract a value from the std 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. Access to the same shared state from multiple threads is safe if each thread does it through its own copy of a shared_future object. valid() == false. The programs is ill-formed if std::chrono::is_clock_v<Clock> is false. 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. Aug 2, 2020 · If the future is the result of a call to async that used lazy evaluation, this function returns immediately without waiting. . Since your function doesn't guarantee that the returned future implements Unpin, your return value will be considered to not implement Future. 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, or std::promise) can provide a std::future object to the creator of that asynchronous operation. Right after calling this function, valid () is false. jqc4e, jptq9o, wjmerr, eurt5, sujb, p8mb, od9qs, t4pj6p, 8zupaf, opwg,