io::Completion Concept Reference

Concept for a completion handler. More...

#include <io/detail/concepts.hpp>

Concept definition

template<typename Fn>
concept io::Completion =  requires(Fn &&func) {
  requires std::is_invocable_v<Fn>;
  typename std::invoke_result_t<Fn>::value_type;
  requires std::is_same_v<
      std::invoke_result_t<Fn>,
      std::optional<typename std::invoke_result_t<Fn>::value_type>>;
}

Detailed Description

Concept for a completion handler.

Template Parameters

Fn	The function type.