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<span class="mlabels"><span class="mlabel">constexpr</span></span>  </td>
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<p><code>#include &lt;<a class="el" href="fwd_2eval__if_8hpp.html">boost/hana/fwd/eval_if.hpp</a>&gt;</code></p>
<b>Initial value:</b><div class="fragment"><div class="line">= [](<span class="keyword">auto</span>&amp;&amp; cond, <span class="keyword">auto</span>&amp;&amp; <a class="code" href="group__group-_monad.html#gaaddd3789de43cf989babb10cdc0b447a">then</a>, <span c