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<h2><span class="refentrytitle">Struct template _env_var</span></h2>
<p>boost::proto::_env_var &#8212; 
          A primitive transform that returns the value associated with a particular <code class="computeroutput">Key</code>
          in the current transform environment.
        </p>
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<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> Key<span class="special">&gt;</span> 
<span class="keyword">struct</span> <a class="link" href="_env_var.html" title="Struct template _env_var">_env_var</a> <span class="special">:</span> <span class="keyword"></span> <a class="link" href="transform.html" title="Struct template transform">proto::transform</a>&lt;_env_var&lt;Key&gt; &gt; <span class="special">{</span>
  <span class="comment">// member classes/structs/unions</span>
  
  <span class="keyword">struct</span> <a class="link" href="_env_var/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; &gt; <span class="special">{</span>
    <span class="comment">// types</span>
    <span class="keyword">typedef</span> <span class="keyword">typename</span> <a class="link" href="result_of/env_var.html" title="Struct template env_var">proto::result_of::env_var</a><span class="special">&lt;</span><span class="identifier">Data</span><span class="special">,</span> <span class="identifier">Key</span><span class="special">&gt;</span><span class="special">::</span><span class="identifier">type</span> <a class="link" href="_env_var/impl.html#boost.proto._env_var.impl.result_type"><span class="identifier">result_type</span></a><span class="special">;</span>

    <span class="comment">// <a class="link" href="_env_var/impl.html#idp931361248-bb">public member functions</a></span>
    <span class="identifier">result_type</span> <a class="link" href="_env_var/impl.html#idp931361808-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> 
                           <span class="keyword">typename</span> <span class="identifier">impl</span><span class="special">::</span><span class="identifier">state_param</span><span class="special">,</span> 
                           <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>
  <span class="special">}</span><span class="special">;</span>
<span class="special">}</span><span class="special">;</span></pre></div>
<div class="refsect1">
<a name="idp569427024"></a><h2>Description</h2>
<p>
            See <code class="computeroutput"><a class="link" href="_env_var/impl.html" title="Struct template impl">proto::_env_var::impl</a></code> for the full details.
          </p>
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<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>)
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