cation requires this to indicate "no error"</span>
        <span class="identifier">ec</span> <span class="special">=</span> <span class="special">{};</span>

        <span class="keyword">return</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">none</span><span class="special">;</span> <span class="comment">// for exposition only</span>
    <span class="special">}</span>
<span class="special">};</span>
</pre>
<h5>
<a name="beast.concepts.BodyWriter.h3"></a>