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<div class="section" id="boost-mpl-has-xxx-trait-named-def">
<h1><a class="toc-backref" href="./introspection.html#id1596">BOOST_MPL_HAS_XXX_TRAIT_NAMED_DEF</a></h1>
<div class="section" id="id1336">
<h3><a class="subsection-title" href="#synopsis" name="synopsis">Synopsis</a></h3>
<pre class="literal-block">
#define <a href="./has-xxx-trait-named-def.html" class="identifier">BOOST_MPL_HAS_XXX_TRAIT_NAMED_DEF</a>(trait, name, default_) \
    <em>unspecified token sequence</em> \
/**/
</pre>
</div>
<div class="section" id="id1337">
<h3><a class="subsection-title" href="#description" name="description">Description</a></h3>
<p>Expands into a definition of a boolean unary <a class="reference internal" href="./metafunction.html">Metafunction</a> <tt class="literal"><span class="pre">trait</span></tt>
such that for any type <tt class="literal"><span class="pre">x</span></tt> <tt class="literal"><span class="pre">trait&lt;x&gt;::value</span> <span class="pre">==</span> <span class="pre">true</span></tt> if and only
if <tt class="literal"><span class="pre">x</span></tt> is a class type and has a nested type memeber <tt class="literal"><span class="pre">x::name</span></tt>.</p>
<p>On the deficient compilers not capabale of performing the detection,
<tt class="literal"><span class="pre">trait&lt;x&gt;::value</span></tt> always returns a fallback value <tt class="literal"><span class="pre">default_</span></tt>.
A boolean configuraion macro, <a class="reference internal" href="./cfg-no-has-xxx.html">BOOST_MPL_CFG_NO_HAS_XXX</a>, is provided
to signal or override the &quot;deficient&quot; status of a particular compiler.
[<em>Note:</em> The fallback value can also be provided at the point of the
metafunction invocation; see the <cite>Expression semantics</cite> section for
details — <em>end note</em>]</p>
</div>
<div class="section" id="id1338">
<h3><a class="subsection-title" href="#header" name="header">Header</a></h3>
<pre class="literal-block">
#include &lt;<a href="../../../../boost/mpl/has_xxx.hpp" class="header">boost/mpl/has_xxx.hpp</a>&gt;
</pre>
</div>
<div class="section" id="id1339">
<h3><a class="subsection-title" href="#parameters" name="parameters">Parameters</a></h3>
<table border="1" class="docutils table">
<colgroup>
<col width="15%" />
<col width="32%" />
<col width="53%" />
</colgroup>
<thead valign="bottom">
<tr><th class="head">Parameter</th>
<th class="head">Requirement</th>
<th class="head">Description</th>
</tr>
</thead>
<tbody valign="top">
<tr><td><tt class="literal"><span class="pre">trait</span></tt></td>
<td>A legal identifier token</td>
<td>A name of the metafunction to be generated.</td>
</tr>
<tr><td><tt class="literal"><span class="pre">name</span></tt></td>
<td>A legal identifier token</td>
<td>A name of the member being detected.</td>
</tr>
<tr><td><tt class="literal"><span class="pre">default_</span></tt></td>
<td>An boolean constant</td>
<td>A fallback value for the deficient compilers.</td>
</tr>
</tbody>
</table>
</div>
<div class="section" id="id1340">
<h3><a class="subsection-title" href="#expression-semantics" name="expression-semantics">Expression semantics</a></h3>
<p>For any legal C++ identifiers <tt class="literal"><span class="pre">trait</span></tt> and <tt class="literal"><span class="pre">name</span></tt>, boolean constant expression <tt class="literal"><span class="pre">c1</span></tt>,
boolean <a class="reference internal" href="./integral-constant.html">Integral Constant</a> <tt class="literal"><span class="pre">c2</span></tt>, and arbitrary type <tt class="literal"><span class="pre">x</span></tt>:</p>
<pre class="literal-block">
<a href="./has-xxx-trait-named-def.html" class="identifier">BOOST_MPL_HAS_XXX_TRAIT_NAMED_DEF</a>(trait, name, c1)
</pre>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field"><th class="field-name">Precondition:</th><td class="field-body"><p class="first">Appears at namespace scope.</p>
</td>
</tr>
<tr class="field"><th class="field-name">Return type:</th><td class="field-body"><p class="first">None.</p>
</td>
</tr>
<tr class="field"><th class="field-name">Semantics:</th><td class="field-body"><p class="first">Expands into an equivalent of the following class template definition</p>
<pre class="literal-block">
template&lt; typename X, typename fallback = boost::mpl::<a href="./bool.html" class="identifier">bool_</a>&lt;c1&gt; &gt;
struct trait
{
    // <em>unspecified</em>
    // ...
};
</pre>
<p>where <tt class="literal"><span class="pre">trait</span></tt> is a boolean <a class="reference internal" href="./metafunction.html">Metafunction</a> with the following semantics:</p>
<pre class="literal-block">
typedef trait&lt;x&gt;::type r;
</pre>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field"><th class="field-name">Return type:</th><td class="field-body"><a class="reference internal" href="./integral-constant.html">Integral Constant</a>.</td>
</tr>
<tr class="field"><th class="field-name">Semantics:</th><td class="field-body">If <a class="reference internal" href="./cfg-no-has-xxx.html">BOOST_MPL_CFG_NO_HAS_XXX</a> is defined, <tt class="literal"><span class="pre">r::value</span> <span class="pre">==</span> <span class="pre">c1</span></tt>;
otherwise, <tt class="literal"><span class="pre">r::value</span> <span class="pre">==</span> <span class="pre">true</span></tt> if and only if <tt class="literal"><span class="pre">x</span></tt> is a class type
that has a nested type memeber <tt class="literal"><span class="pre">x::name</span></tt>.</td>
</tr>
</tbody>
</table>
<pre class="literal-block">
typedef trait&lt; x,c2 &gt;::type r;
</pre>
<table class="last docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field"><th class="field-name">Return type:</th><td class="field-body"><p class="first"><a class="reference internal" href="./integral-constant.html">Integral Constant</a>.</p>
</td>
</tr>
<tr class="field"><th class="field-name">Semantics:</th><td class="field-body"><p class="first">If <a class="reference internal" href="./cfg-no-has-xxx.html">BOOST_MPL_CFG_NO_HAS_XXX</a> is defined, <tt class="literal"><span class="pre">r::value</span> <span class="pre">==</span> <span class="pre">c2::value</span></tt>;
otherwise, equivalent to</p>
<pre class="last literal-block">
typedef trait&lt;x&gt;::type r;
</pre>
</td>
</tr>
</tbody>
</table>
</td>
</tr>
</tbody>
</table>
</div>
<div class="section" id="id1341">
<h3><a class="subsection-title" href="#example" name="example">Example</a></h3>
<pre class="literal-block">
<a href="./has-xxx-trait-named-def.html" class="identifier">BOOST_MPL_HAS_XXX_TRAIT_NAMED_DEF</a>(has_xxx, xxx, false)

struct test1 {};
struct test2 { void xxx(); };
struct test3 { int xxx; };
struct test4 { static int xxx(); };
struct test5 { template&lt; typename T &gt; struct xxx {}; };
struct test6 { typedef int xxx; };
struct test7 { struct xxx; };
struct test8 { typedef void (*xxx)(); };
struct test9 { typedef void (xxx)(); };

<a href="./assert-not.html" class="identifier">BOOST_MPL_ASSERT_NOT</a>(( has_xxx&lt;test1&gt; ));
<a href="./assert-not.html" class="identifier">BOOST_MPL_ASSERT_NOT</a>(( has_xxx&lt;test2&gt; ));
<a href="./assert-not.html" class="identifier">BOOST_MPL_ASSERT_NOT</a>(( has_xxx&lt;test3&gt; ));
<a href="./assert-not.html" class="identifier">BOOST_MPL_ASSERT_NOT</a>(( has_xxx&lt;test4&gt; ));
<a href="./assert-not.html" class="identifier">BOOST_MPL_ASSERT_NOT</a>(( has_xxx&lt;test5&gt; ));

#if !defined(<a href="./cfg-no-has-xxx.html" class="identifier">BOOST_MPL_CFG_NO_HAS_XXX</a>)
<a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( has_xxx&lt;test6&gt; ));
<a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( has_xxx&lt;test7&gt; ));
<a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( has_xxx&lt;test8&gt; ));
<a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( has_xxx&lt;test9&gt; ));
#endif

<a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( has_xxx&lt;test6,<a href="./bool.html" class="identifier">true_</a>&gt; ));
<a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( has_xxx&lt;test7,<a href="./bool.html" class="identifier">true_</a>&gt; ));
<a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( has_xxx&lt;test8,<a href="./bool.html" class="identifier">true_</a>&gt; ));
<a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( has_xxx&lt;test9,<a href="./bool.html" class="identifier">true_</a>&gt; ));
</pre>
</div>
<div class="section" id="id1342">
<h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3>
<p><a class="reference internal" href="./macros.html">Macros</a>, <a class="reference internal" href="./has-xxx-trait-def.html">BOOST_MPL_HAS_XXX_TRAIT_DEF</a>, <a class="reference internal" href="./cfg-no-has-xxx.html">BOOST_MPL_CFG_NO_HAS_XXX</a></p>
</div>
</div>

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<td><div class="copyright-footer"><div class="copyright">Copyright ©  2001-2009 Aleksey Gurtovoy and David Abrahams</div>
Distributed under the Boost Software License, Version 1.0. (See accompanying
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	4	<head>
	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_TRAIT_NAMED_DEF</title>
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	10	<body class="docframe refmanual">
	11	<table class="header"><tr class="header"><td class="header-group navigation-bar"><span class="navigation-group"><a href="./has-xxx-trait-def.html" class="navigation-link">Prev</a> <a href="./configuration.html" class="navigation-link">Next</a></span><span class="navigation-group-separator"> \| </span><span class="navigation-group"><a href="./has-xxx-trait-def.html" class="navigation-link">Back</a> Along</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-trait-named-def.html" class="navigation-link">BOOST_MPL_HAS_XXX_TRAIT_NAMED_DEF</a></td>
	13	</tr></table><div class="header-separator"></div>
	14	<div class="section" id="boost-mpl-has-xxx-trait-named-def">
	15	<h1><a class="toc-backref" href="./introspection.html#id1596">BOOST_MPL_HAS_XXX_TRAIT_NAMED_DEF</a></h1>
	16	<div class="section" id="id1336">
	17	<h3><a class="subsection-title" href="#synopsis" name="synopsis">Synopsis</a></h3>
	18	<pre class="literal-block">
	19	#define <a href="./has-xxx-trait-named-def.html" class="identifier">BOOST_MPL_HAS_XXX_TRAIT_NAMED_DEF</a>(trait, name, default_) \
	20	<em>unspecified token sequence</em> \
	21	/**/
	22	</pre>
	23	</div>
	24	<div class="section" id="id1337">
	25	<h3><a class="subsection-title" href="#description" name="description">Description</a></h3>
	26	<p>Expands into a definition of a boolean unary <a class="reference internal" href="./metafunction.html">Metafunction</a> <tt class="literal"><span class="pre">trait</span></tt>
	27	such that for any type <tt class="literal"><span class="pre">x</span></tt> <tt class="literal"><span class="pre">trait<x>::value</span> <span class="pre">==</span> <span class="pre">true</span></tt> if and only
	28	if <tt class="literal"><span class="pre">x</span></tt> is a class type and has a nested type memeber <tt class="literal"><span class="pre">x::name</span></tt>.</p>
	29	<p>On the deficient compilers not capabale of performing the detection,
	30	<tt class="literal"><span class="pre">trait<x>::value</span></tt> always returns a fallback value <tt class="literal"><span class="pre">default_</span></tt>.
	31	A boolean configuraion macro, <a class="reference internal" href="./cfg-no-has-xxx.html">BOOST_MPL_CFG_NO_HAS_XXX</a>, is provided
	32	to signal or override the "deficient" status of a particular compiler.
	33	[<em>Note:</em> The fallback value can also be provided at the point of the
	34	metafunction invocation; see the <cite>Expression semantics</cite> section for
	35	details — <em>end note</em>]</p>
	36	</div>
	37	<div class="section" id="id1338">
	38	<h3><a class="subsection-title" href="#header" name="header">Header</a></h3>
	39	<pre class="literal-block">
	40	#include <<a href="../../../../boost/mpl/has_xxx.hpp" class="header">boost/mpl/has_xxx.hpp</a>>
	41	</pre>
	42	</div>
	43	<div class="section" id="id1339">
	44	<h3><a class="subsection-title" href="#parameters" name="parameters">Parameters</a></h3>
	45	<table border="1" class="docutils table">
	46	<colgroup>
	47	<col width="15%" />
	48	<col width="32%" />
	49	<col width="53%" />
	50	</colgroup>
	51	<thead valign="bottom">
	52	<tr><th class="head">Parameter</th>
	53	<th class="head">Requirement</th>
	54	<th class="head">Description</th>
	55	</tr>
	56	</thead>
	57	<tbody valign="top">
	58	<tr><td><tt class="literal"><span class="pre">trait</span></tt></td>
	59	<td>A legal identifier token</td>
	60	<td>A name of the metafunction to be generated.</td>
	61	</tr>
	62	<tr><td><tt class="literal"><span class="pre">name</span></tt></td>
	63	<td>A legal identifier token</td>
	64	<td>A name of the member being detected.</td>
65	</tr>
66	<tr><td><tt class="literal"><span class="pre">default_</span></tt></td>
67	<td>An boolean constant</td>
68	<td>A fallback value for the deficient compilers.</td>
69	</tr>
70	</tbody>
71	</table>
72	</div>
73	<div class="section" id="id1340">
74	<h3><a class="subsection-title" href="#expression-semantics" name="expression-semantics">Expression semantics</a></h3>
75	<p>For any legal C++ identifiers <tt class="literal"><span class="pre">trait</span></tt> and <tt class="literal"><span class="pre">name</span></tt>, boolean constant expression <tt class="literal"><span class="pre">c1</span></tt>,
76	boolean <a class="reference internal" href="./integral-constant.html">Integral Constant</a> <tt class="literal"><span class="pre">c2</span></tt>, and arbitrary type <tt class="literal"><span class="pre">x</span></tt>:</p>
77	<pre class="literal-block">
78	<a href="./has-xxx-trait-named-def.html" class="identifier">BOOST_MPL_HAS_XXX_TRAIT_NAMED_DEF</a>(trait, name, c1)
79	</pre>
80	<table class="docutils field-list" frame="void" rules="none">
81	<col class="field-name" />
82	<col class="field-body" />
83	<tbody valign="top">
84	<tr class="field"><th class="field-name">Precondition:</th><td class="field-body"><p class="first">Appears at namespace scope.</p>
85	</td>
86	</tr>
87	<tr class="field"><th class="field-name">Return type:</th><td class="field-body"><p class="first">None.</p>
88	</td>
89	</tr>
90	<tr class="field"><th class="field-name">Semantics:</th><td class="field-body"><p class="first">Expands into an equivalent of the following class template definition</p>
91	<pre class="literal-block">
92	template< typename X, typename fallback = boost::mpl::<a href="./bool.html" class="identifier">bool_</a><c1> >
93	struct trait
94	{
95	// <em>unspecified</em>
96	// ...
97	};
98	</pre>
99	<p>where <tt class="literal"><span class="pre">trait</span></tt> is a boolean <a class="reference internal" href="./metafunction.html">Metafunction</a> with the following semantics:</p>
100	<pre class="literal-block">
101	typedef trait<x>::type r;
102	</pre>
103	<table class="docutils field-list" frame="void" rules="none">
104	<col class="field-name" />
105	<col class="field-body" />
106	<tbody valign="top">
107	<tr class="field"><th class="field-name">Return type:</th><td class="field-body"><a class="reference internal" href="./integral-constant.html">Integral Constant</a>.</td>
108	</tr>
109	<tr class="field"><th class="field-name">Semantics:</th><td class="field-body">If <a class="reference internal" href="./cfg-no-has-xxx.html">BOOST_MPL_CFG_NO_HAS_XXX</a> is defined, <tt class="literal"><span class="pre">r::value</span> <span class="pre">==</span> <span class="pre">c1</span></tt>;
110	otherwise, <tt class="literal"><span class="pre">r::value</span> <span class="pre">==</span> <span class="pre">true</span></tt> if and only if <tt class="literal"><span class="pre">x</span></tt> is a class type
111	that has a nested type memeber <tt class="literal"><span class="pre">x::name</span></tt>.</td>
112	</tr>
113	</tbody>
114	</table>
115	<pre class="literal-block">
116	typedef trait< x,c2 >::type r;
117	</pre>
118	<table class="last docutils field-list" frame="void" rules="none">
119	<col class="field-name" />
120	<col class="field-body" />
121	<tbody valign="top">
122	<tr class="field"><th class="field-name">Return type:</th><td class="field-body"><p class="first"><a class="reference internal" href="./integral-constant.html">Integral Constant</a>.</p>
123	</td>
124	</tr>
125	<tr class="field"><th class="field-name">Semantics:</th><td class="field-body"><p class="first">If <a class="reference internal" href="./cfg-no-has-xxx.html">BOOST_MPL_CFG_NO_HAS_XXX</a> is defined, <tt class="literal"><span class="pre">r::value</span> <span class="pre">==</span> <span class="pre">c2::value</span></tt>;
126	otherwise, equivalent to</p>
127	<pre class="last literal-block">
128	typedef trait<x>::type r;
129	</pre>
130	</td>
131	</tr>
132	</tbody>
133	</table>
134	</td>
135	</tr>
136	</tbody>
137	</table>
138	</div>
139	<div class="section" id="id1341">
140	<h3><a class="subsection-title" href="#example" name="example">Example</a></h3>
141	<pre class="literal-block">
142	<a href="./has-xxx-trait-named-def.html" class="identifier">BOOST_MPL_HAS_XXX_TRAIT_NAMED_DEF</a>(has_xxx, xxx, false)
143
144	struct test1 {};
145	struct test2 { void xxx(); };
146	struct test3 { int xxx; };
147	struct test4 { static int xxx(); };
148	struct test5 { template< typename T > struct xxx {}; };
149	struct test6 { typedef int xxx; };
150	struct test7 { struct xxx; };
151	struct test8 { typedef void (*xxx)(); };
152	struct test9 { typedef void (xxx)(); };
153
154	<a href="./assert-not.html" class="identifier">BOOST_MPL_ASSERT_NOT</a>(( has_xxx<test1> ));
155	<a href="./assert-not.html" class="identifier">BOOST_MPL_ASSERT_NOT</a>(( has_xxx<test2> ));
156	<a href="./assert-not.html" class="identifier">BOOST_MPL_ASSERT_NOT</a>(( has_xxx<test3> ));
157	<a href="./assert-not.html" class="identifier">BOOST_MPL_ASSERT_NOT</a>(( has_xxx<test4> ));
158	<a href="./assert-not.html" class="identifier">BOOST_MPL_ASSERT_NOT</a>(( has_xxx<test5> ));
159
160	#if !defined(<a href="./cfg-no-has-xxx.html" class="identifier">BOOST_MPL_CFG_NO_HAS_XXX</a>)
161	<a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( has_xxx<test6> ));
162	<a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( has_xxx<test7> ));
163	<a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( has_xxx<test8> ));
164	<a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( has_xxx<test9> ));
165	#endif
166
167	<a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( has_xxx<test6,<a href="./bool.html" class="identifier">true_</a>> ));
168	<a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( has_xxx<test7,<a href="./bool.html" class="identifier">true_</a>> ));
169	<a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( has_xxx<test8,<a href="./bool.html" class="identifier">true_</a>> ));
170	<a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( has_xxx<test9,<a href="./bool.html" class="identifier">true_</a>> ));
171	</pre>
172	</div>
173	<div class="section" id="id1342">
174	<h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3>
175	<p><a class="reference internal" href="./macros.html">Macros</a>, <a class="reference internal" href="./has-xxx-trait-def.html">BOOST_MPL_HAS_XXX_TRAIT_DEF</a>, <a class="reference internal" href="./cfg-no-has-xxx.html">BOOST_MPL_CFG_NO_HAS_XXX</a></p>
176	</div>
177	</div>
178
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