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| 7 | <title>The MPL Reference Manual: BOOST_MPL_HAS_XXX_TEMPLATE_DEF</title> | |
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| 12 | <td class="header-group page-location"><a href="../refmanual.html" class="navigation-link">Front Page</a> / <a href="./macros.html" class="navigation-link">Macros</a> / <a href="./introspection.html" class="navigation-link">Introspection</a> / <a href="./has-xxx-template-def.html" class="navigation-link">BOOST_MPL_HAS_XXX_TEMPLATE_DEF</a></td> | |
| 13 | </tr></table><div class="header-separator"></div> | |
| 14 | <div class="section" id="boost-mpl-has-xxx-template-def"> | |
| 15 | <h1><a class="toc-backref" href="./introspection.html#id1593">BOOST_MPL_HAS_XXX_TEMPLATE_DEF</a></h1> | |
| 16 | <div class="section" id="id1315"> | |
| 17 | <h3><a class="subsection-title" href="#synopsis" name="synopsis">Synopsis</a></h3> | |
| 18 | <pre class="literal-block"> | |
| 19 | #define <a href="./has-xxx-template-def.html" class="identifier">BOOST_MPL_HAS_XXX_TEMPLATE_DEF</a>(name) \ | |
| 20 | <em>unspecified token sequence</em> \ | |
| 21 | /**/ | |
| 22 | </pre> | |
| 23 | </div> | |
| 24 | <div class="section" id="id1316"> | |
| 25 | <h3><a class="subsection-title" href="#description" name="description">Description</a></h3> | |
| 26 | <p>Expands into the definition of a boolean <a class="reference internal" href="./metafunction.html">Metafunction</a> <tt class="literal"><span class="pre">has_name</span></tt> | |
| 27 | such that for any type <tt class="literal"><span class="pre">x</span></tt> <tt class="literal"><span class="pre">has_name<x>::value</span> <span class="pre">==</span> <span class="pre">true</span></tt> if and | |
| 28 | only if <tt class="literal"><span class="pre">x</span></tt> is a class type and has a nested template member | |
| 29 | <tt class="literal"><span class="pre">x::template</span> <span class="pre">name</span></tt> with no more than | |
| 30 | <a class="reference internal" href="./limit-metafunction-arity.html">BOOST_MPL_LIMIT_METAFUNCTION_ARITY</a> parameters.</p> | |
| 31 | <p>On deficient compilers not capable of performing the detection, | |
| 32 | <tt class="literal"><span class="pre">has_name<x>::value</span></tt> is always <tt class="literal"><span class="pre">false</span></tt>. A boolean configuration | |
| 33 | macro, <a class="reference internal" href="./cfg-no-has-xxx-template.html">BOOST_MPL_CFG_NO_HAS_XXX_TEMPLATE</a>, is provided to signal or | |
| 34 | override the "deficient" status of a particular compiler.</p> | |
| 35 | <p>[<em>Note:</em> <a class="reference internal" href="./has-xxx-template-def.html">BOOST_MPL_HAS_XXX_TEMPLATE_DEF</a> is a simplified front end to | |
| 36 | the <a class="reference internal" href="./has-xxx-template-named-def.html">BOOST_MPL_HAS_XXX_TEMPLATE_NAMED_DEF</a> introspection macro — <em>end note</em>]</p> | |
| 37 | </div> | |
| 38 | <div class="section" id="id1317"> | |
| 39 | <h3><a class="subsection-title" href="#header" name="header">Header</a></h3> | |
| 40 | <pre class="literal-block"> | |
| 41 | #include <<a href="../../../../boost/mpl/has_xxx.hpp" class="header">boost/mpl/has_xxx.hpp</a>> | |
| 42 | </pre> | |
| 43 | </div> | |
| 44 | <div class="section" id="id1318"> | |
| 45 | <h3><a class="subsection-title" href="#parameters" name="parameters">Parameters</a></h3> | |
| 46 | <table border="1" class="docutils table"> | |
| 47 | <colgroup> | |
| 48 | <col width="15%" /> | |
| 49 | <col width="32%" /> | |
| 50 | <col width="53%" /> | |
| 51 | </colgroup> | |
| 52 | <thead valign="bottom"> | |
| 53 | <tr><th class="head">Parameter</th> | |
| 54 | <th class="head">Requirement</th> | |
| 55 | <th class="head">Description</th> | |
| 56 | </tr> | |
| 57 | </thead> | |
| 58 | <tbody valign="top"> | |
| 59 | <tr><td><tt class="literal"><span class="pre">name</span></tt></td> | |
| 60 | <td>A legal identifier token</td> | |
| 61 | <td>A name of the template member being detected.</td> | |
| 62 | </tr> | |
| 63 | </tbody> | |
| 64 | </table> | |
| 65 | </div> | |
| 66 | <div class="section" id="id1319"> | |
| 67 | <h3><a class="subsection-title" href="#expression-semantics" name="expression-semantics">Expression semantics</a></h3> | |
| 68 | <p>For any legal C++ identifier <tt class="literal"><span class="pre">name</span></tt>:</p> | |
| 69 | <pre class="literal-block"> | |
| 70 | <a href="./has-xxx-template-def.html" class="identifier">BOOST_MPL_HAS_XXX_TEMPLATE_DEF</a>(name) | |
| 71 | </pre> | |
| 72 | <table class="docutils field-list" frame="void" rules="none"> | |
| 73 | <col class="field-name" /> | |
| 74 | <col class="field-body" /> | |
| 75 | <tbody valign="top"> | |
| 76 | <tr class="field"><th class="field-name">Precondition:</th><td class="field-body"><p class="first">Appears at namespace scope.</p> | |
| 77 | </td> | |
| 78 | </tr> | |
| 79 | <tr class="field"><th class="field-name">Return type:</th><td class="field-body"><p class="first">None.</p> | |
| 80 | </td> | |
| 81 | </tr> | |
| 82 | <tr class="field"><th class="field-name">Semantics:</th><td class="field-body"><p class="first">Equivalent to</p> | |
| 83 | <pre class="last literal-block"> | |
| 84 | <a href="./has-xxx-template-named-def.html" class="identifier">BOOST_MPL_HAS_XXX_TEMPLATE_NAMED_DEF</a>( | |
| 85 | BOOST_PP_CAT(has_,name), name, false | |
| 86 | ) | |
| 87 | </pre> | |
| 88 | </td> | |
| 89 | </tr> | |
| 90 | </tbody> | |
| 91 | </table> | |
| 92 | </div> | |
| 93 | <div class="section" id="id1320"> | |
| 94 | <h3><a class="subsection-title" href="#example" name="example">Example</a></h3> | |
| 95 | <pre class="literal-block"> | |
| 96 | <a href="./has-xxx-template-def.html" class="identifier">BOOST_MPL_HAS_XXX_TEMPLATE_DEF</a>(xxx) | |
| 97 | ||
| 98 | struct test1 {}; | |
| 99 | struct test2 { void xxx(); }; | |
| 100 | struct test3 { int xxx; }; | |
| 101 | struct test4 { static int xxx(); }; | |
| 102 | struct test5 { typedef int xxx; }; | |
| 103 | struct test6 { struct xxx; }; | |
| 104 | struct test7 { typedef void (*xxx)(); }; | |
| 105 | struct test8 { typedef void (xxx)(); }; | |
| 106 | struct test9 { template< class T > struct xxx {}; }; | |
| 107 | ||
| 108 | <a href="./assert-not.html" class="identifier">BOOST_MPL_ASSERT_NOT</a>(( has_xxx<test1> )); | |
| 109 | <a href="./assert-not.html" class="identifier">BOOST_MPL_ASSERT_NOT</a>(( has_xxx<test2> )); | |
| 110 | <a href="./assert-not.html" class="identifier">BOOST_MPL_ASSERT_NOT</a>(( has_xxx<test3> )); | |
| 111 | <a href="./assert-not.html" class="identifier">BOOST_MPL_ASSERT_NOT</a>(( has_xxx<test4> )); | |
| 112 | <a href="./assert-not.html" class="identifier">BOOST_MPL_ASSERT_NOT</a>(( has_xxx<test5> )); | |
| 113 | <a href="./assert-not.html" class="identifier">BOOST_MPL_ASSERT_NOT</a>(( has_xxx<test6> )); | |
| 114 | <a href="./assert-not.html" class="identifier">BOOST_MPL_ASSERT_NOT</a>(( has_xxx<test7> )); | |
| 115 | <a href="./assert-not.html" class="identifier">BOOST_MPL_ASSERT_NOT</a>(( has_xxx<test8> )); | |
| 116 | ||
| 117 | #if !defined(<a href="./cfg-no-has-xxx-template.html" class="identifier">BOOST_MPL_CFG_NO_HAS_XXX_TEMPLATE</a>) | |
| 118 | <a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( has_xxx<test9> )); | |
| 119 | #endif | |
| 120 | ||
| 121 | <a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( has_xxx<test9, <a href="./bool.html" class="identifier">true_</a>> )); | |
| 122 | </pre> | |
| 123 | </div> | |
| 124 | <div class="section" id="id1321"> | |
| 125 | <h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3> | |
| 126 | <p><a class="reference internal" href="./macros.html">Macros</a>, <a class="reference internal" href="./has-xxx-template-named-def.html">BOOST_MPL_HAS_XXX_TEMPLATE_NAMED_DEF</a>, | |
| 127 | <a class="reference internal" href="./cfg-no-has-xxx-template.html">BOOST_MPL_CFG_NO_HAS_XXX_TEMPLATE</a>, <a class="reference internal" href="./limit-metafunction-arity.html">BOOST_MPL_LIMIT_METAFUNCTION_ARITY</a></p> | |
| 128 | <!-- Macros/Introspection//BOOST_MPL_HAS_XXX_TEMPLATE_NAMED_DEF --> | |
| 129 | <!-- Copyright Daniel Walker 2007. --> | |
| 130 | <!-- Distributed under the Boost --> | |
| 131 | <!-- Software License, Version 1.0. (See accompanying --> | |
| 132 | <!-- file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) --> | |
| 133 | </div> | |
| 134 | </div> | |
| 135 | ||
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