Start an asynchronous receive.

template<
    typename MutableBufferSequence,
    typename ReadToken = default_completion_token_t<executor_type>>
DEDUCED async_receive(
    const MutableBufferSequence & buffers,
    socket_base::message_flags & out_flags,
    ReadToken && token = default_completion_token_t< executor_type >());
  » more...

template<
    typename MutableBufferSequence,
    typename ReadToken = default_completion_token_t<executor_type>>
DEDUCED async_receive(
    const MutableBufferSequence & buffers,
    socket_base::message_flags in_flags,
    socket_base::message_flags & out_flags,
    ReadToken && token = default_completion_token_t< executor_type >());
  » more...