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| <h2><span class="refentrytitle">Function has_env_var</span></h2> |
| <p>boost::proto::has_env_var — |
| For testing to see whether a value exists in a transform environment corresponding to the |
| specified <code class="computeroutput">Key</code>. |
| </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: <<a class="link" href="../../proto/reference.html#header.boost.proto.transform.env_hpp" title="Header <boost/proto/transform/env.hpp>">boost/proto/transform/env.hpp</a>> |
| |
| </span> |
| <span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> Key<span class="special">,</span> <span class="keyword">typename</span> Env<span class="special">></span> |
| <span class="keyword">typename</span> <a class="link" href="result_of/has_env_var.html" title="Struct template has_env_var">proto::result_of::has_env_var</a><span class="special"><</span><span class="identifier">Env</span> <span class="special">&</span><span class="special">,</span> <span class="identifier">Key</span><span class="special">></span><span class="special">::</span><span class="identifier">type</span> |
| <span class="identifier">has_env_var</span><span class="special">(</span><span class="identifier">Env</span> <span class="special">&</span> e<span class="special">)</span><span class="special">;</span> |
| <span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> Key<span class="special">,</span> <span class="keyword">typename</span> Env<span class="special">></span> |
| <span class="keyword">typename</span> <a class="link" href="result_of/has_env_var.html" title="Struct template has_env_var">proto::result_of::has_env_var</a><span class="special"><</span><span class="identifier">Env</span> <span class="keyword">const</span> <span class="special">&</span><span class="special">,</span> <span class="identifier">Key</span><span class="special">></span><span class="special">::</span><span class="identifier">type</span> |
| <span class="identifier">has_env_var</span><span class="special">(</span><span class="identifier">Env</span> <span class="keyword">const</span> <span class="special">&</span> e<span class="special">)</span><span class="special">;</span></pre></div> |
| <div class="refsect1"> |
| <a name="idp382203552"></a><h2>Description</h2> |
| <p> |
| See also: |
| </p> |
| <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem"><code class="computeroutput"><a class="link" href="functional/has_env_var.html#idp202582256-bb">proto::functional::has_env_var::operator()</a></code></li></ul></div> |
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| <tbody><tr> |
| <td><p><span class="term">Returns:</span></p></td> |
| <td><code class="computeroutput"><a class="link" href="functional/has_env_var.html" title="Struct template has_env_var">proto::functional::has_env_var<Key></a>()(e)</code></td> |
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| <td align="right"><div class="copyright-footer">Copyright © 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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