boost_1_45_0/libs/mpl/doc/refmanual/has-xxx-template-named-def.html - nest-learning-thermostat/5.0/boost - Git at Google

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 </tr></table><div class="header-separator"></div>
 <div class="section" id="boost-mpl-has-xxx-template-named-def">
 <h1><a class="toc-backref" href="./introspection.html#id1594">BOOST_MPL_HAS_XXX_TEMPLATE_NAMED_DEF</a></h1>
 <div class="section" id="id1322">
 <h3><a class="subsection-title" href="#synopsis" name="synopsis">Synopsis</a></h3>
 <pre class="literal-block">
 #define <a href="./has-xxx-template-named-def.html" class="identifier">BOOST_MPL_HAS_XXX_TEMPLATE_NAMED_DEF</a>(trait, name, default_) \
     <em>unspecified token sequence</em> \
 /**/
 </pre>
 </div>
 <div class="section" id="id1323">
 <h3><a class="subsection-title" href="#description" name="description">Description</a></h3>
 <p>Expands into the definition of a boolean <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 template member <tt class="literal"><span class="pre">x::template</span>
 <span class="pre">name</span></tt> with no more than <a class="reference internal" href="./limit-metafunction-arity.html">BOOST_MPL_LIMIT_METAFUNCTION_ARITY</a>
 parameters.</p>
 <p>On deficient compilers not capable 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 configuration 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 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="id1324">
 <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="id1325">
 <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="id1326">
 <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-template-named-def.html" class="identifier">BOOST_MPL_HAS_XXX_TEMPLATE_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-template.html">BOOST_MPL_CFG_NO_HAS_XXX_TEMPLATE</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 template member <tt class="literal"><span class="pre">x::template</span>
 <span class="pre">name</span></tt> with no more than <a class="reference internal" href="./limit-metafunction-arity.html">BOOST_MPL_LIMIT_METAFUNCTION_ARITY</a>.</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-template.html">BOOST_MPL_CFG_NO_HAS_XXX_TEMPLATE</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="id1327">
 <h3><a class="subsection-title" href="#example" name="example">Example</a></h3>
 <pre class="literal-block">
 <a href="./has-xxx-template-named-def.html" class="identifier">BOOST_MPL_HAS_XXX_TEMPLATE_NAMED_DEF</a>(
     has_xxx, xxx, false
 )

 struct test1  {};
 struct test2  { void xxx(); };
 struct test3  { int xxx; };
 struct test4  { static int xxx(); };
 struct test5  { typedef int xxx; };
 struct test6  { struct xxx; };
 struct test7  { typedef void (*xxx)(); };
 struct test8  { typedef void (xxx)(); };
 struct test9  { template&lt; class T &gt; struct 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; ));
 <a href="./assert-not.html" class="identifier">BOOST_MPL_ASSERT_NOT</a>(( has_xxx&lt;test6&gt; ));
 <a href="./assert-not.html" class="identifier">BOOST_MPL_ASSERT_NOT</a>(( has_xxx&lt;test7&gt; ));
 <a href="./assert-not.html" class="identifier">BOOST_MPL_ASSERT_NOT</a>(( has_xxx&lt;test8&gt; ));

 #if !defined(<a href="./cfg-no-has-xxx-template.html" class="identifier">BOOST_MPL_CFG_NO_HAS_XXX_TEMPLATE</a>)
 <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;test9, <a href="./bool.html" class="identifier">true_</a>&gt; ));
 </pre>
 </div>
 <div class="section" id="id1328">
 <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-template-def.html">BOOST_MPL_HAS_XXX_TEMPLATE_DEF</a>,
 <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>
 <!-- Macros/Introspection//BOOST_MPL_HAS_XXX_TRAIT_DEF -->
 </div>
 </div>

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	<title>The MPL Reference Manual: BOOST_MPL_HAS_XXX_TEMPLATE_NAMED_DEF</title>
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	</tr></table><div class="header-separator"></div>
	<div class="section" id="boost-mpl-has-xxx-template-named-def">
	<h1><a class="toc-backref" href="./introspection.html#id1594">BOOST_MPL_HAS_XXX_TEMPLATE_NAMED_DEF</a></h1>
	<div class="section" id="id1322">
	<h3><a class="subsection-title" href="#synopsis" name="synopsis">Synopsis</a></h3>
	<pre class="literal-block">
	#define <a href="./has-xxx-template-named-def.html" class="identifier">BOOST_MPL_HAS_XXX_TEMPLATE_NAMED_DEF</a>(trait, name, default_) \
	<em>unspecified token sequence</em> \
	/**/
	</pre>
	</div>
	<div class="section" id="id1323">
	<h3><a class="subsection-title" href="#description" name="description">Description</a></h3>
	<p>Expands into the definition of a boolean <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<x>::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 template member <tt class="literal"><span class="pre">x::template</span>
	<span class="pre">name</span></tt> with no more than <a class="reference internal" href="./limit-metafunction-arity.html">BOOST_MPL_LIMIT_METAFUNCTION_ARITY</a>
	parameters.</p>
	<p>On deficient compilers not capable of performing the detection,
	<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>. A
	boolean configuration 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 override the "deficient" 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="id1324">
	<h3><a class="subsection-title" href="#header" name="header">Header</a></h3>
	<pre class="literal-block">
	#include <<a href="../../../../boost/mpl/has_xxx.hpp" class="header">boost/mpl/has_xxx.hpp</a>>
	</pre>
	</div>
	<div class="section" id="id1325">
	<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="id1326">
	<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-template-named-def.html" class="identifier">BOOST_MPL_HAS_XXX_TEMPLATE_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<
	typename X
	, typename fallback = boost::mpl::<a href="./bool.html" class="identifier">bool_</a><c1>
	>
	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<x>::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-template.html">BOOST_MPL_CFG_NO_HAS_XXX_TEMPLATE</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 template member <tt class="literal"><span class="pre">x::template</span>
	<span class="pre">name</span></tt> with no more than <a class="reference internal" href="./limit-metafunction-arity.html">BOOST_MPL_LIMIT_METAFUNCTION_ARITY</a>.</td>
	</tr>
	</tbody>
	</table>
	<pre class="literal-block">
	typedef trait< x, c2 >::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-template.html">BOOST_MPL_CFG_NO_HAS_XXX_TEMPLATE</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<x>::type r;
	</pre>
	</td>
	</tr>
	</tbody>
	</table>
	</td>
	</tr>
	</tbody>
	</table>
	</div>
	<div class="section" id="id1327">
	<h3><a class="subsection-title" href="#example" name="example">Example</a></h3>
	<pre class="literal-block">
	<a href="./has-xxx-template-named-def.html" class="identifier">BOOST_MPL_HAS_XXX_TEMPLATE_NAMED_DEF</a>(
	has_xxx, xxx, false
	)

	struct test1 {};
	struct test2 { void xxx(); };
	struct test3 { int xxx; };
	struct test4 { static int xxx(); };
	struct test5 { typedef int xxx; };
	struct test6 { struct xxx; };
	struct test7 { typedef void (*xxx)(); };
	struct test8 { typedef void (xxx)(); };
	struct test9 { template< class T > struct xxx {}; };

	<a href="./assert-not.html" class="identifier">BOOST_MPL_ASSERT_NOT</a>(( has_xxx<test1> ));
	<a href="./assert-not.html" class="identifier">BOOST_MPL_ASSERT_NOT</a>(( has_xxx<test2> ));
	<a href="./assert-not.html" class="identifier">BOOST_MPL_ASSERT_NOT</a>(( has_xxx<test3> ));
	<a href="./assert-not.html" class="identifier">BOOST_MPL_ASSERT_NOT</a>(( has_xxx<test4> ));
	<a href="./assert-not.html" class="identifier">BOOST_MPL_ASSERT_NOT</a>(( has_xxx<test5> ));
	<a href="./assert-not.html" class="identifier">BOOST_MPL_ASSERT_NOT</a>(( has_xxx<test6> ));
	<a href="./assert-not.html" class="identifier">BOOST_MPL_ASSERT_NOT</a>(( has_xxx<test7> ));
	<a href="./assert-not.html" class="identifier">BOOST_MPL_ASSERT_NOT</a>(( has_xxx<test8> ));

	#if !defined(<a href="./cfg-no-has-xxx-template.html" class="identifier">BOOST_MPL_CFG_NO_HAS_XXX_TEMPLATE</a>)
	<a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( has_xxx<test9> ));
	#endif

	<a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( has_xxx<test9, <a href="./bool.html" class="identifier">true_</a>> ));
	</pre>
	</div>
	<div class="section" id="id1328">
	<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-template-def.html">BOOST_MPL_HAS_XXX_TEMPLATE_DEF</a>,
	<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>
	<!-- Macros/Introspection//BOOST_MPL_HAS_XXX_TRAIT_DEF -->
	</div>
	</div>

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