I/O.
                  </p>
<p>
                    The <span class="bold"><strong>ConstBufferSequence</strong></span> interface
                    allows callers to send data from memory-mapped regions (not possible
                    in websocketpp). Callers can also use the same buffers to send
                    data to multiple streams, for example broadcasting common subscription
                    data to many clients at once. For each call to <code class="computeroutput"><span class="identifier"