r">stream</span><span class="special">)</span>
<span class="special">{</span>
    <span class="comment">// This object will hold our state when reading the line.</span>

    <span class="keyword">struct</span> <span class="identifier">echo_line</span>
    <span class="special">{</span>
        <span class="identifier">basic_stream</span><span class="special">&lt;</span><span class="identifier">Protocol</span><span class="special">,</span> <span class="identifier">Executor</span><span class="special">&gt;&am