documentation" id="id37">4.3&nbsp;&nbsp;&nbsp;Documentation</a></li>
</ul>
</li>
<li><a class="reference internal" href="#portability-considerations" id="id38">5&nbsp;&nbsp;&nbsp;Portability Considerations</a><ul class="auto-toc">
<li><a class="reference internal" href="#no-sfinae-support" id="id39">5.1&nbsp;&nbsp;&nbsp;No SFINAE Support</a></li>
<li><a class="reference internal" href="#no-support-for-result-of" id="id40">5.2&nbsp;&nbsp;&nbsp;No Support for <tt class="docutils literal">result_of</tt></a></l