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  <div class="titlepage"><div><div><h1 style="clear: both"><code>static bool _has_error_is_errno(Impl &amp;&amp;) noexcept</code></h1></div></div></div>
  <p>Returns true if the error code in the implementation passed in has a domain or category matching that of POSIX <code>errno</code>. 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>