dentifier">expires_after</span> <span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">chrono</span><span class="special">::</span><span class="identifier">seconds</span><span class="special">(</span><span class="number">15</span><span class="special">));</span>

<span class="comment">// Read another line from the stream into our dynamic buffer.</span>
<span class="comment">// The operation will time out after 15 seconds.</span>

<span class=