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  27 <a name="boost.proto._env"></a><div class="titlepage"></div>
  28 <div class="refnamediv">
  29 <h2><span class="refentrytitle">Struct _env</span></h2>
  30 <p>boost::proto::_env &#8212;
  31           A primitive transform that returns the current transform environment unmodified.
  32         </p>
  33 </div>
  34 <h2 xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv-title">Synopsis</h2>
  35 <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;
  36
  37 </span>
  38 <span class="keyword">struct</span> <a class="link" href="_env.html" title="Struct _env">_env</a> <span class="special">:</span> <span class="keyword"></span> <a class="link" href="transform.html" title="Struct template transform">proto::transform</a>&lt;_env&gt; <span class="special">{</span>
  39   <span class="comment">// member classes/structs/unions</span>
  40
  41   <span class="keyword">struct</span> <a class="link" href="_env/impl.html" title="Struct template impl">impl</a> <span class="special">:</span> <span class="keyword"></span> <a class="link" href="transform_impl.html" title="Struct template transform_impl">proto::transform_impl</a>&lt;Expr, State, Data&gt; <span class="special">{</span>
  42     <span class="comment">// types</span>
  43     <span class="keyword">typedef</span> <span class="identifier">Data</span> <a class="link" href="_env/impl.html#boost.proto._env.impl.result_type"><span class="identifier">result_type</span></a><span class="special">;</span>
  44
  45     <span class="comment">// <a class="link" href="_env/impl.html#idp705176960-bb">public member functions</a></span>
  46     <span class="identifier">result_type</span> <a class="link" href="_env/impl.html#idp705177520-bb"><span class="keyword">operator</span><span class="special">(</span><span class="special">)</span></a><span class="special">(</span><span class="keyword">typename</span> <span class="identifier">impl</span><span class="special">::</span><span class="identifier">expr_param</span><span class="special">,</span>
  47                            <span class="keyword">typename</span> <span class="identifier">impl</span><span class="special">::</span><span class="identifier">state_param</span><span class="special">,</span>
  48                            <span class="keyword">typename</span> <span class="identifier">impl</span><span class="special">::</span><span class="identifier">data_param</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
  49   <span class="special">}</span><span class="special">;</span>
  50 <span class="special">}</span><span class="special">;</span></pre></div>
  51 <div class="refsect1">
  52 <a name="idp481844480"></a><h2>Description</h2>
  53 <p>
  54             See <code class="computeroutput"><a class="link" href="_env/impl.html" title="Struct template impl">proto::_env::impl</a></code> for the full details.
  55           </p>
  56 </div>
  57 </div>
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  59 <td align="left"></td>
  60 <td align="right"><div class="copyright-footer">Copyright &#169; 2008 Eric Niebler<p>
  61         Distributed under the Boost Software License, Version 1.0. (See accompanying
  62         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>)
  63       </p>
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