.content_length.synopsis"></a></span><a class="link" href="content_length.html#beast.ref.boost__beast__http__parser.content_length.synopsis">Synopsis</a>
        </h6>
<pre class="programlisting"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">optional</span><span class="special">&lt;</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">uint64_t</span> <span class="special">&gt;</span>
<span class="identifier">content_