st::hana::_</a></div><div class="ttdeci">constexpr unspecified _</div><div class="ttdoc">Create simple functions representing C++ operators inline.</div><div class="ttdef"><b>Definition:</b> placeholder.hpp:70</div></div>
</div><!-- fragment --><p>What happens here is that <code>eval_if</code> will call <code>eval</code> on the selected branch. In turn, <code>eval</code> will call the selected branch either with nothing &ndash; for the <em>then</em> branch &ndash; or with <code><a class="el" href="group__gr