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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
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::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
std::promise lt;R gt;::set_exception - cppreference. com Atomically stores the exception pointer p into the shared state and makes the state ready The operation behaves as though set_value, set_exception, set_value_at_thread_exit, and set_exception_at_thread_exit acquire a single mutex associated with the promise object while updating the promise object An exception is thrown if there is no shared state or the shared state already stores a value