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<div class="section" id="boost-mpl-has-xxx-trait-def">
<h1><a class="toc-backref" href="./introspection.html#id1595">BOOST_MPL_GET_TAG_DEF</a></h1>
<div class="section" id="id1329">
<h3><a class="subsection-title" href="#synopsis" name="synopsis">Synopsis</a></h3>
<pre class="literal-block">
#define <a href="./has-xxx-trait-def.html" class="identifier">BOOST_MPL_GET_TAG_DEF</a>(name) \
    <em>unspecified token sequence</em> \
/**/
</pre>
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<div class="section" id="id1330">
<h3><a class="subsection-title" href="#description" name="description">Description</a></h3>
<p>Expands into a definition of a lazy getter <a class="reference internal" href="./metafunction.html">Metafunction</a> <tt class="literal"><span class="pre">get_tag_name</span></tt>
such that for any type <tt class="literal"><span class="pre">x</span></tt> <tt class="literal"><span class="pre">get_tag_name&lt;x&gt;::type</span> <span class="pre">is</span> <span class="pre">type</span></tt> where
 <tt class="literal"><span class="pre">name</span></tt> is a nested type member of <tt class="literal"><span class="pre">x</span></tt>.</p>
</div>
<div class="section" id="id1331">
<h3><a class="subsection-title" href="#header" name="header">Header</a></h3>
<pre class="literal-block">
#include &lt;<a href="../../../../boost/mpl/get_tag.hpp" class="header">boost/mpl/get_tag.hpp</a>&gt;
</pre>
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<div class="section" id="id1332">
<h3><a class="subsection-title" href="#parameters" name="parameters">Parameters</a></h3>
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<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">name</span></tt></td>
<td>A legal identifier token</td>
<td>A name of the member to get.</td>
</tr>
</tbody>
</table>
</div>
<div class="section" id="id1333">
<h3><a class="subsection-title" href="#expression-semantics" name="expression-semantics">Expression semantics</a></h3>
<p>For any legal C++ identifier <tt class="literal"><span class="pre">name</span></tt>:</p>
<pre class="literal-block">
<a href="./has-xxx-trait-def.html" class="identifier">BOOST_MPL_GET_TAG_DEF</a>(name)
</pre>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
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<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">Equivalent to</p>
<pre class="last literal-block">
namespace boost { namespace mpl {</pre>
    <pre class="last literal-block">
template<typename T>&lt;class T&gt;
struct get_##name {
	typedef typename T::name type;
};</pre>
    <pre class="last literal-block">
}}<typename T>
</pre>
</td>
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<div class="section" id="id1334">
<h3><a class="subsection-title" href="#example" name="example">Example</a></h3>
<pre class="literal-block">
struct test_type_get_tag_def;

<a href="get-tag-def.html" class="identifier">BOOST_MPL_GET_TAG_DEF</a>(a_tag);

namespace boost { namespace mpl {

struct test_type_get_tag_def
{
	typedef int a_tag;
};

}}

typedef boost::mpl::get_a_tag&lt;<test_type_get_tag_def>test_type_get_tag_def&gt;::type   got_the_tag;

</pre>
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<div class="section" id="id1335">
<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-named-def.html">BOOST_MPL_HAS_XXX_TRAIT_NAMED_DEF</a>
<!-- Macros/Introspection/BOOST_MPL_GET_TAG_DEF -->
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<td><div class="copyright-footer"><div class="copyright">Copyright ©  2017 Sergey Krivonos and Edward Diener</div>
Distributed under the Boost Software License, Version 1.0. (See accompanying
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