span>,
          is implemented in terms of calls to the next layer's <code class="computeroutput"><span class="identifier">async_write_some</span></code>
          function. The program must ensure that no other calls to <a class="link" href="write.html" title="websocket::stream::write"><code class="computeroutput"><span class="identifier">websocket</span><span class="special">::</span><span class="identifier">stream</span><span class="special">::</span><span class="identifier">write</span></code></a>, <a 