<span class="keyword">struct</span> <a class="link" href="is_env.html" title="Struct template is_env">is_env</a> <span class="special">:</span> <span class="keyword"></span> mpl::bool_<<em class="replaceable"><code>true-or-false</code></em>> <span class="special">{</span>
<span class="special">}</span><span class="special">;</span></pre></div>
<div class="refsect1">
-<a name="idp569087776"></a><h2>Description</h2>
+<a name="idp481409328"></a><h2>Description</h2>
<p><code class="computeroutput">is_env<T></code> inherits from <code class="computeroutput">mpl::true_</code> under the following
conditions:
</p>