</span><span class="special">()-&gt;</span><span class="identifier">in_avail</span><span class="special">()</span> <span class="special">&gt;</span> <span class="number">0</span><span class="special">)</span>
        <span class="special">{</span>
            <span class="comment">// Get a mutable buffer sequence for writing</span>
            <span class="keyword">auto</span> <span class="keyword">const</span> <span class="identifier">b</span> <span class="special">=</span> <span class="identifier">buffer<