Receive some data on the socket.

template<
    typename MutableBufferSequence>
std::size_t receive(
    const MutableBufferSequence & buffers);

template<
    typename MutableBufferSequence>
std::size_t receive(
    const MutableBufferSequence & buffers,
    socket_base::message_flags flags);

template<
    typename MutableBufferSequence>
std::size_t receive(
    const MutableBufferSequence & buffers,
    socket_base::message_flags flags,
    boost::system::error_code & ec);