libs/tti/doc/html/BOOST_TTI_HAS_DATA.html

   1 <html>
   2 <head>
   3 <meta http-equiv="Content-Type" content="text/html; charset=US-ASCII">
   4 <title>Macro BOOST_TTI_HAS_DATA</title>
   5 <link rel="stylesheet" href="../../../../doc/src/boostbook.css" type="text/css">
   6 <meta name="generator" content="DocBook XSL Stylesheets V1.79.1">
   7 <link rel="home" href="index.html" title="Chapter&#160;1.&#160;The Type Traits Introspection Library">
   8 <link rel="up" href="header/boost/tti/has_data_hpp.html" title="Header &lt;boost/tti/has_data.hpp&gt;">
   9 <link rel="prev" href="BOOST_TTI_TRAIT_HAS_DATA.html" title="Macro BOOST_TTI_TRAIT_HAS_DATA">
  10 <link rel="next" href="header/boost/tti/has_function_hpp.html" title="Header &lt;boost/tti/has_function.hpp&gt;">
  11 </head>
  12 <body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
  13 <table cellpadding="2" width="100%"><tr>
  14 <td valign="top"><img alt="Boost C++ Libraries" width="277" height="86" src="../../../../boost.png"></td>
  15 <td align="center"><a href="../../../../index.html">Home</a></td>
  16 <td align="center"><a href="../../../../libs/libraries.htm">Libraries</a></td>
  17 <td align="center"><a href="http://www.boost.org/users/people.html">People</a></td>
  18 <td align="center"><a href="http://www.boost.org/users/faq.html">FAQ</a></td>
  19 <td align="center"><a href="../../../../more/index.htm">More</a></td>
  20 </tr></table>
  21 <hr>
  22 <div class="spirit-nav">
  23 <a accesskey="p" href="BOOST_TTI_TRAIT_HAS_DATA.html"><img src="../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="header/boost/tti/has_data_hpp.html"><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="header/boost/tti/has_function_hpp.html"><img src="../../../../doc/src/images/next.png" alt="Next"></a>
  24 </div>
  25 <div class="refentry">
  26 <a name="BOOST_TTI_HAS_DATA"></a><div class="titlepage"></div>
  27 <div class="refnamediv">
  28 <h2><span class="refentrytitle">Macro BOOST_TTI_HAS_DATA</span></h2>
  29 <p>BOOST_TTI_HAS_DATA &#8212; Expands to a metafunction which tests whether member data or static member data with a particular name and type exists. </p>
  30 </div>
  31 <h2 xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv-title">Synopsis</h2>
  32 <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="header/boost/tti/has_data_hpp.html" title="Header &lt;boost/tti/has_data.hpp&gt;">boost/tti/has_data.hpp</a>&gt;
  33
  34 </span>BOOST_TTI_HAS_DATA(name)</pre></div>
  35 <div class="refsect1">
  36 <a name="idp100130640"></a><h2>Description</h2>
  37 <p>name = the name of the inner member.</p>
  38 <p>generates a metafunction called "has_data_name" where 'name' is the macro parameter.       template&lt;class BOOST_TTI_TP_T,class BOOST_TTI_TP_TYPE&gt;
  39       struct has_data_name
  40         {
  41         static const value = unspecified;
  42         typedef mpl::bool_&lt;true-or-false&gt; type;
  43         };
  44
  45       The metafunction types and return:
  46
  47         BOOST_TTI_TP_T    = the enclosing type in which to look for our 'name'
  48
  49         BOOST_TTI_TP_TYPE = The type of the member data or static member.
  50
  51         returns  = 'value' is true if the 'name' exists, with the correct data type,
  52                    otherwise 'value' is false. </p>
  53 </div>
  54 </div>
  55 <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
  56 <td align="left"></td>
  57 <td align="right"><div class="copyright-footer">Copyright &#169; 2011-2013 Tropic Software
  58       East Inc<p>
  59         Distributed under the Boost Software License, Version 1.0. (See accompanying
  60         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>)
  61       </p>
  62 </div></td>
  63 </tr></table>
  64 <hr>
  65 <div class="spirit-nav">
  66 <a accesskey="p" href="BOOST_TTI_TRAIT_HAS_DATA.html"><img src="../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="header/boost/tti/has_data_hpp.html"><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="header/boost/tti/has_function_hpp.html"><img src="../../../../doc/src/images/next.png" alt="Next"></a>
  67 </div>
  68 </body>
  69 </html>