1 <?xml version=
"1.0" encoding=
"utf-8" ?>
2 <!DOCTYPE html PUBLIC
"-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
3 <html xmlns=
"http://www.w3.org/1999/xhtml" xml:
lang=
"en" lang=
"en">
5 <meta http-equiv=
"Content-Type" content=
"text/html; charset=utf-8" />
6 <meta name=
"generator" content=
"Docutils 0.7: http://docutils.sourceforge.net/" />
7 <title>The MPL Reference Manual: BOOST_MPL_HAS_XXX_TEMPLATE_DEF
</title>
8 <link rel=
"stylesheet" href=
"../style.css" type=
"text/css" />
10 <body class=
"docframe refmanual">
11 <table class=
"header"><tr class=
"header"><td class=
"header-group navigation-bar"><span class=
"navigation-group"><a href=
"./introspection.html" class=
"navigation-link">Prev
</a> <a href=
"./has-xxx-template-named-def.html" class=
"navigation-link">Next
</a></span><span class=
"navigation-group-separator"> |
</span><span class=
"navigation-group">Back
<a href=
"./has-xxx-template-named-def.html" class=
"navigation-link">Along
</a></span><span class=
"navigation-group-separator"> |
</span><span class=
"navigation-group"><a href=
"./introspection.html" class=
"navigation-link">Up
</a> <a href=
"../refmanual.html" class=
"navigation-link">Home
</a></span><span class=
"navigation-group-separator"> |
</span><span class=
"navigation-group"><a href=
"./refmanual_toc.html" class=
"navigation-link">Full TOC
</a></span></td>
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> \
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>
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>>
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">
52 <thead valign=
"bottom">
53 <tr><th class=
"head">Parameter
</th>
54 <th class=
"head">Requirement
</th>
55 <th class=
"head">Description
</th>
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>
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)
72 <table class=
"docutils field-list" frame=
"void" rules=
"none">
73 <col class=
"field-name" />
74 <col class=
"field-body" />
76 <tr class=
"field"><th class=
"field-name">Precondition:
</th><td class=
"field-body"><p class=
"first">Appears at namespace scope.
</p>
79 <tr class=
"field"><th class=
"field-name">Return type:
</th><td class=
"field-body"><p class=
"first">None.
</p>
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
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)
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 {}; };
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
> ));
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
> ));
121 <a href=
"./assert.html" class=
"identifier">BOOST_MPL_ASSERT
</a>(( has_xxx
<test9,
<a href=
"./bool.html" class=
"identifier">true_
</a>> ));
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) -->
136 <div class=
"footer-separator"></div>
137 <table class=
"footer"><tr class=
"footer"><td class=
"header-group navigation-bar"><span class=
"navigation-group"><a href=
"./introspection.html" class=
"navigation-link">Prev
</a> <a href=
"./has-xxx-template-named-def.html" class=
"navigation-link">Next
</a></span><span class=
"navigation-group-separator"> |
</span><span class=
"navigation-group">Back
<a href=
"./has-xxx-template-named-def.html" class=
"navigation-link">Along
</a></span><span class=
"navigation-group-separator"> |
</span><span class=
"navigation-group"><a href=
"./introspection.html" class=
"navigation-link">Up
</a> <a href=
"../refmanual.html" class=
"navigation-link">Home
</a></span><span class=
"navigation-group-separator"> |
</span><span class=
"navigation-group"><a href=
"./refmanual_toc.html" class=
"navigation-link">Full TOC
</a></span></td>
138 <td><div class=
"copyright-footer"></div></td></tr></table></body>