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7 <title>The MPL Reference Manual: apply
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14 <div class=
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"apply">
15 <h1><a class=
"toc-backref" href=
"./invocation.html#id1525">apply
</a></h1>
16 <div class=
"section" id=
"id887">
17 <h3><a class=
"subsection-title" href=
"#synopsis" name=
"synopsis">Synopsis
</a></h3>
18 <pre class=
"literal-block">
24 typedef
<em>unspecified
</em> type;
28 typename F, typename A1
32 typedef
<em>unspecified
</em> type;
38 typename F, typename A1,
<em>...
</em> typename An
40 struct
<a href=
"./apply.html" class=
"identifier">apply
</a><em>n
</em>
42 typedef
<em>unspecified
</em> type;
47 , typename A1 =
<em>unspecified
</em>
49 , typename An =
<em>unspecified
</em>
51 struct
<a href=
"./apply.html" class=
"identifier">apply
</a>
53 typedef
<em>unspecified
</em> type;
57 <div class=
"section" id=
"id888">
58 <h3><a class=
"subsection-title" href=
"#description" name=
"description">Description
</a></h3>
59 <p>Invokes a
<a class=
"reference internal" href=
"./metafunction-class.html">Metafunction Class
</a> or a
<a class=
"reference internal" href=
"./lambda-expression.html">Lambda Expression
</a> <tt class=
"literal"><span class=
"pre">F
</span></tt> with arguments
<tt class=
"literal"><span class=
"pre">A1
</span></tt>,...
<tt class=
"literal"><span class=
"pre">An
</span></tt>.
</p>
61 <div class=
"section" id=
"id889">
62 <h3><a class=
"subsection-title" href=
"#header" name=
"header">Header
</a></h3>
63 <pre class=
"literal-block">
64 #include
<<a href=
"../../../../boost/mpl/apply.hpp" class=
"header">boost/mpl/apply.hpp
</a>>
67 <div class=
"section" id=
"id890">
68 <h3><a class=
"subsection-title" href=
"#parameters" name=
"parameters">Parameters
</a></h3>
69 <table border=
"1" class=
"docutils table">
75 <thead valign=
"bottom">
76 <tr><th class=
"head">Parameter
</th>
77 <th class=
"head">Requirement
</th>
78 <th class=
"head">Description
</th>
82 <tr><td><tt class=
"literal"><span class=
"pre">F
</span></tt></td>
83 <td><a class=
"reference internal" href=
"./lambda-expression.html">Lambda Expression
</a></td>
84 <td>An expression to invoke.
</td>
86 <tr><td><tt class=
"literal"><span class=
"pre">A1
</span></tt>,...
<tt class=
"literal"><span class=
"pre">An
</span></tt></td>
88 <td>Invocation arguments.
</td>
93 <div class=
"section" id=
"id891">
94 <h3><a class=
"subsection-title" href=
"#expression-semantics" name=
"expression-semantics">Expression semantics
</a></h3>
95 <p>For any
<a class=
"reference internal" href=
"./lambda-expression.html">Lambda Expression
</a> <tt class=
"literal"><span class=
"pre">f
</span></tt> and arbitrary types
<tt class=
"literal"><span class=
"pre">a1
</span></tt>,...
<tt class=
"literal"><span class=
"pre">an
</span></tt>:
</p>
96 <pre class=
"literal-block">
97 typedef
<a href=
"./apply.html" class=
"identifier">apply
</a><em>n
</em><f,a1,
<em>...
</em>a
<em>n
</em>>::type t;
98 typedef
<a href=
"./apply.html" class=
"identifier">apply
</a><f,a1,
<em>...
</em>a
<em>n
</em>>::type t;
100 <table class=
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"none">
101 <col class=
"field-name" />
102 <col class=
"field-body" />
104 <tr class=
"field"><th class=
"field-name">Return type:
</th><td class=
"field-body">Any type.
</td>
106 <tr class=
"field"><th class=
"field-name">Semantics:
</th><td class=
"field-body">Equivalent to
<tt class=
"literal"><span class=
"pre">typedef
</span> <span class=
"pre"><a href=
"./apply-wrap.html" class=
"identifier">apply_wrap
</a></span></tt><em>n
</em><tt class=
"literal"><span class=
"pre"><</span> <span class=
"pre"><a href=
"./lambda.html" class=
"identifier">lambda
</a><f
>::type,a1,...
</span> <span class=
"pre">an
>::type
</span> <span class=
"pre">t;
</span></tt>.
</td>
111 <div class=
"section" id=
"id892">
112 <h3><a class=
"subsection-title" href=
"#example" name=
"example">Example
</a></h3>
113 <pre class=
"literal-block">
114 template
< typename N1, typename N2
> struct int_plus
115 :
<a href=
"./int.html" class=
"identifier">int_
</a><( N1::value + N2::value )
>
119 typedef
<a href=
"./apply.html" class=
"identifier">apply
</a>< int_plus
<<a href=
"./placeholders.html" class=
"identifier">_1
</a>,
<a href=
"./placeholders.html" class=
"identifier">_2
</a>>,
<a href=
"./int.html" class=
"identifier">int_
</a><2>,
<a href=
"./int.html" class=
"identifier">int_
</a><3> >::type r1;
120 typedef
<a href=
"./apply.html" class=
"identifier">apply
</a>< <a href=
"./quote.html" class=
"identifier">quote
</a><tt class=
"literal"><span class=
"pre">2</span></tt><int_plus
>,
<a href=
"./int.html" class=
"identifier">int_
</a><2>,
<a href=
"./int.html" class=
"identifier">int_
</a><3> >::type r2;
122 <a href=
"./assert-relation.html" class=
"identifier">BOOST_MPL_ASSERT_RELATION
</a>( r1::value, ==,
5 );
123 <a href=
"./assert-relation.html" class=
"identifier">BOOST_MPL_ASSERT_RELATION
</a>( r2::value, ==,
5 );
126 <div class=
"section" id=
"id893">
127 <h3><a class=
"subsection-title" href=
"#see-also" name=
"see-also">See also
</a></h3>
128 <p><a class=
"reference internal" href=
"./metafunctions.html">Metafunctions
</a>,
<a class=
"reference internal" href=
"./apply-wrap.html">apply_wrap
</a>,
<a class=
"reference internal" href=
"./lambda.html">lambda
</a>,
<a class=
"reference internal" href=
"./quote.html">quote
</a>,
<a class=
"reference internal" href=
"./bind.html">bind
</a></p>
129 <!-- Metafunctions/Invocation//apply_wrap |20 -->
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135 <td><div class=
"copyright-footer"><div class=
"copyright">Copyright ©
2001-
2009 Aleksey Gurtovoy and David Abrahams
</div>
136 Distributed under the Boost Software License, Version
1.0. (See accompanying
137 file LICENSE_1_0.txt or copy at
<a class=
"reference external" href=
"http://www.boost.org/LICENSE_1_0.txt" target=
"_top">http://www.boost.org/LICENSE_1_0.txt
</a>)
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