...one of the most highly
regarded and expertly designed C++ library projects in the
world. — Herb Sutter and Andrei
Completion token type used to specify that an error produced by an asynchronous operation is captured to an error_code variable.
template< typename CompletionToken> class redirect_error_t
class is used to indicate that any error_code produced by an asynchronous
operation is captured to a specified variable.