class="special">(</span>
    <span class="identifier">net</span><span class="special">::</span><span class="identifier">basic_stream_socket</span><span class="special">&lt;</span> <span class="identifier">net</span><span class="special">::</span><span class="identifier">ip</span><span class="special">::</span><span class="identifier">tcp</span><span class="special">,</span> <span class="identifier">Executor</span> <span class="special">&gt;&amp;</span> <span class="identifier">s1</span><span class="special"