...one of the most highly
regarded and expertly designed C++ library projects in the
world.
— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards
template< typename T> cancel_at_timer( T && completion_token, basic_waitable_timer< Clock, WaitTraits, Executor > & timer, const typename Clock::time_point & expiry, cancellation_type_t cancel_type = cancellation_type::terminal);