doc/html/boost/proto/has_env_var_idp705085456.html

   1 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
   2 <html>
   3 <head>
   4 <meta http-equiv="Content-Type" content="text/html; charset=US-ASCII">
   5 <title>Function has_env_var</title>
   6 <link rel="stylesheet" href="../../../../doc/src/boostbook.css" type="text/css">
   7 <meta name="generator" content="DocBook XSL Stylesheets V1.79.1">
   8 <link rel="home" href="../../index.html" title="The Boost C++ Libraries BoostBook Documentation Subset">
   9 <link rel="up" href="../../proto/reference.html#header.boost.proto.transform.env_hpp" title="Header &lt;boost/proto/transform/env.hpp&gt;">
  10 <link rel="prev" href="as_env_idp705071568.html" title="Function as_env">
  11 <link rel="next" href="env_var_idp705099008.html" title="Function env_var">
  12 </head>
  13 <body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
  14 <table cellpadding="2" width="100%"><tr>
  15 <td valign="top"><img alt="Boost C++ Libraries" width="277" height="86" src="../../../../boost.png"></td>
  16 <td align="center"><a href="../../../../index.html">Home</a></td>
  17 <td align="center"><a href="../../../../libs/libraries.htm">Libraries</a></td>
  18 <td align="center"><a href="http://www.boost.org/users/people.html">People</a></td>
  19 <td align="center"><a href="http://www.boost.org/users/faq.html">FAQ</a></td>
  20 <td align="center"><a href="../../../../more/index.htm">More</a></td>
  21 </tr></table>
  22 <hr>
  23 <div class="spirit-nav">
  24 <a accesskey="p" href="as_env_idp705071568.html"><img src="../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../../proto/reference.html#header.boost.proto.transform.env_hpp"><img src="../../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../../index.html"><img src="../../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="env_var_idp705099008.html"><img src="../../../../doc/src/images/next.png" alt="Next"></a>
  25 </div>
  26 <div class="refentry">
  27 <a name="boost.proto.has_env_var_idp705085456"></a><div class="titlepage"></div>
  28 <div class="refnamediv">
  29 <h2><span class="refentrytitle">Function has_env_var</span></h2>
  30 <p>boost::proto::has_env_var &#8212;
  31           For testing to see whether a value exists in a transform environment corresponding to the
  32           specified <code class="computeroutput">Key</code>.
  33         </p>
  34 </div>
  35 <h2 xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv-title">Synopsis</h2>
  36 <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;
  37
  38 </span>
  39 <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> Key<span class="special">,</span> <span class="keyword">typename</span> Env<span class="special">&gt;</span>
  40   <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">&lt;</span><span class="identifier">Env</span> <span class="special">&amp;</span><span class="special">,</span> <span class="identifier">Key</span><span class="special">&gt;</span><span class="special">::</span><span class="identifier">type</span>
  41   <span class="identifier">has_env_var</span><span class="special">(</span><span class="identifier">Env</span> <span class="special">&amp;</span> e<span class="special">)</span><span class="special">;</span>
  42 <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> Key<span class="special">,</span> <span class="keyword">typename</span> Env<span class="special">&gt;</span>
  43   <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">&lt;</span><span class="identifier">Env</span> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">,</span> <span class="identifier">Key</span><span class="special">&gt;</span><span class="special">::</span><span class="identifier">type</span>
  44   <span class="identifier">has_env_var</span><span class="special">(</span><span class="identifier">Env</span> <span class="keyword">const</span> <span class="special">&amp;</span> e<span class="special">)</span><span class="special">;</span></pre></div>
  45 <div class="refsect1">
  46 <a name="idp481576784"></a><h2>Description</h2>
  47 <p>
  48             See also:
  49             </p>
  50 <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#idp705018528-bb">proto::functional::has_env_var::operator()</a></code></li></ul></div>
  51 <p>
  52           </p>
  53 <div class="variablelist"><table border="0" class="variablelist compact">
  54 <colgroup>
  55 <col align="left" valign="top">
  56 <col>
  57 </colgroup>
  58 <tbody><tr>
  59 <td><p><span class="term">Returns:</span></p></td>
  60 <td><code class="computeroutput"><a class="link" href="functional/has_env_var.html" title="Struct template has_env_var">proto::functional::has_env_var&lt;Key&gt;</a>()(e)</code></td>
  61 </tr></tbody>
  62 </table></div>
  63 </div>
  64 </div>
  65 <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
  66 <td align="left"></td>
  67 <td align="right"><div class="copyright-footer">Copyright &#169; 2008 Eric Niebler<p>
  68         Distributed under the Boost Software License, Version 1.0. (See accompanying
  69         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>)
  70       </p>
  71 </div></td>
  72 </tr></table>
  73 <hr>
  74 <div class="spirit-nav">
  75 <a accesskey="p" href="as_env_idp705071568.html"><img src="../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../../proto/reference.html#header.boost.proto.transform.env_hpp"><img src="../../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../../index.html"><img src="../../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="env_var_idp705099008.html"><img src="../../../../doc/src/images/next.png" alt="Next"></a>
  76 </div>
  77 </body>
  78 </html>