r throws.</p><li>
	<a href="../reference/policies/base/set_has_value.html" ><code>static void _set_has_value(Impl &amp;&amp;, bool) noexcept</code></a>
<p>Sets whether the implementation has a value. Constexpr, never throws.</p><li>
	<a href="../reference/policies/base/set_has_error.html" ><code>static void _set_has_error(Impl &amp;&amp;, bool) noexcept</code></a>
<p>Sets whether the implementation has an error. Constexpr, never throws.</p><li>
	<a href="../reference/policies/base/set_has_exception.html" ><