entation passed in. Constexpr, never throws.</p><li>
	<a href="../reference/policies/base/has_error_is_errno.html" ><code>static bool _has_error_is_errno(Impl &amp;&amp;) noexcept</code></a>
<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, never throws.</p><li>
	<a href="../reference/policies/base/value.html" ><code>static auto &amp;&amp;_value(Impl &amp;&amp;) noexcept</code></a>
<p>Returns a reference to the va