pan class="identifier">erase</span><span class="special">(</span><span class="identifier">s</span><span class="special">.</span><span class="identifier">begin</span><span class="special">(),</span> <span class="identifier">s</span><span class="special">.</span><span class="identifier">begin</span><span class="special">()</span> <span class="special">+</span> <span class="identifier">bytes_transferred</span><span class="special">);</span>

                <span class="keyword">if</span><span class="special">