" alt="Next"></a></div><div id="content">
  <div class="titlepage"><div><div><h1 style="clear: both"><code>static auto &amp;&amp;_error(Impl &amp;&amp;) noexcept</code></h1></div></div></div>
  <p>Returns a reference to the error in the implementation passed in. No checking is done to ensure there is an error. Constexpr where possible.</p>

<p><em>Requires</em>: Always available.</p>

<p><em>Complexity</em>: Constant time.</p>

<p><em>Guarantees</em>: Never throws an exception.</p>


        </div><p><small