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std::future - cppreference. com 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 The creator of the asynchronous operation can then use a variety of methods to query, wait for, or extract a value from the std
std::future lt;T gt;::share - cppreference. com Transfers the shared state of *this, if any, to a std::shared_future object Multiple std::shared_future objects may reference the same shared state, which is not possible with std::future After calling share on a std::future, valid() == false
std::shared_future - cppreference. com 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 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
std::promise lt;R gt;::get_future - cppreference. com Returns a future object associated with the same shared state as *this An exception is thrown if *this has no shared state or get_future has already been called To get multiple "pop" ends of the promise-future communication channel, use std::future::share