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+<a name="boost.proto.is_env"></a><div class="titlepage"></div>
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+<h2><span class="refentrytitle">Struct template is_env</span></h2>
+<p>boost::proto::is_env &#8212; A Boolean metafuntion for determining whether or not a type is a Proto
+ transform environment.</p>
+</div>
+<h2 xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv-title">Synopsis</h2>
+<div xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv"><pre class="synopsis"><span class="comment">// In header: &lt;<a class="link" href="../../proto/reference.html#header.boost.proto.transform.env_hpp" title="Header &lt;boost/proto/transform/env.hpp&gt;">boost/proto/transform/env.hpp</a>&gt;
+
+</span><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> T<span class="special">&gt;</span>
+<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_&lt;<em class="replaceable"><code>true-or-false</code></em>&gt; <span class="special">{</span>
+<span class="special">}</span><span class="special">;</span></pre></div>
+<div class="refsect1">
+<a name="idp388748656"></a><h2>Description</h2>
+<p><code class="computeroutput">is_env&lt;T&gt;</code> inherits from <code class="computeroutput">mpl::true_</code> under the following
+ conditions:
+ </p>
+<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
+<li class="listitem">If <code class="computeroutput">T</code> is <a class="link" href="empty_env.html" title="Struct empty_env">proto::empty_env</a>.</li>
+<li class="listitem">If <code class="computeroutput">T</code> is a specialization of <a class="link" href="env.html" title="Struct template env">proto::env&lt;&gt;</a>.</li>
+<li class="listitem">If <code class="computeroutput">T</code> is derived from any of the above.</li>
+<li class="listitem">If <code class="computeroutput">T</code> is a cv-qualified variant of any of the above.</li>
+<li class="listitem">If <code class="computeroutput">T</code> is a reference to any of the above.</li>
+</ul></div>
+<p>
+ </p>
+<p>Otherwise, <code class="computeroutput">is_env&lt;T&gt;</code> inherits from <code class="computeroutput">mpl::false_</code>.
+ </p>
+</div>
+</div>
+<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
+<td align="left"></td>
+<td align="right"><div class="copyright-footer">Copyright &#169; 2008 Eric Niebler<p>
+ Distributed under the Boost Software License, Version 1.0. (See accompanying
+ file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
+ </p>
+</div></td>
+</tr></table>
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