...one of the most highly
regarded and expertly designed C++ library projects in the
world.
— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards
Completion token adapter used to specify that the completion handler should carry additional values along with it.
template< typename CompletionToken, typename... Values> constexpr consign_t< decay_t< CompletionToken >, decay_t< Values >... > consign( CompletionToken && completion_token, Values &&... values);
This completion token adapter is typically used to keep at least one copy of an object, such as a smart pointer, alive until the completion handler is called.
Header: boost/asio/consign.hpp
Convenience header: boost/asio.hpp