s="link" href="ref/boost__beast__websocket__stream/control_callback.html" title="websocket::stream::control_callback"><code class="computeroutput"><span class="identifier">websocket</span><span class="special">::</span><span class="identifier">stream</span><span class="special">::</span><span class="identifier">control_callback</span></code></a> now copies or
          moves the function object.
        </li>
<li class="listitem">
          ( <a href="https://github.com/boostorg/beast/issues/1014" target="_