...one of the most highly
regarded and expertly designed C++ library projects in the
world.
— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards
Create a partial completion token adapter that cancels an operation if not complete before the specified relative timeout has elapsed.
template< typename Rep, typename Period> partial_cancel_after< chrono::steady_clock > cancel_after( const chrono::duration< Rep, Period > & timeout, cancellation_type_t cancel_type = cancellation_type::terminal);
When an asynchronous operation is used with cancel_after, a timer async_wait operation is performed in parallel to the main operation. If this parallel async_wait completes first, a cancellation request is emitted to cancel the main operation. Consequently, the application must ensure that the asynchronous operation is performed within an implicit or explicit strand.