...one of the most highly
regarded and expertly designed C++ library projects in the
world.
— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards
Unconditionally invoke the stored completion handler.
void invoke();
Requires this->has_value()
== true . Any dynamic memory used is deallocated before the stored completion
handler is invoked. The executor work guard is also reset before the invocation.