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7 <title>The MPL Reference Manual: push_front
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14 <div class=
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"push-front">
15 <h1><a class=
"toc-backref" href=
"./intrinsic-metafunctions.html#id1444">push_front
</a></h1>
16 <div class=
"section" id=
"id345">
17 <h3><a class=
"subsection-title" href=
"#synopsis" name=
"synopsis">Synopsis
</a></h3>
18 <pre class=
"literal-block">
23 struct
<a href=
"./push-front.html" class=
"identifier">push_front
</a>
25 typedef
<em>unspecified
</em> type;
29 <div class=
"section" id=
"id346">
30 <h3><a class=
"subsection-title" href=
"#description" name=
"description">Description
</a></h3>
31 <p><tt class=
"literal"><span class=
"pre"><a href=
"./push-front.html" class=
"identifier">push_front
</a></span></tt> performs an insertion at the beginning of the sequence with guaranteed
<em>O(
1)
</em>
34 <div class=
"section" id=
"id347">
35 <h3><a class=
"subsection-title" href=
"#header" name=
"header">Header
</a></h3>
36 <pre class=
"literal-block">
37 #include
<<a href=
"../../../../boost/mpl/push_front.hpp" class=
"header">boost/mpl/push_front.hpp
</a>>
40 <div class=
"section" id=
"id348">
41 <h3><a class=
"subsection-title" href=
"#model-of" name=
"model-of">Model of
</a></h3>
42 <p><a class=
"reference internal" href=
"./tag-dispatched-metafunction.html">Tag Dispatched Metafunction
</a></p>
44 <div class=
"section" id=
"id349">
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">Sequence
</span></tt></td>
60 <td><a class=
"reference internal" href=
"./front-extensible-sequence.html">Front Extensible Sequence
</a></td>
61 <td>A sequence to insert into.
</td>
63 <tr><td><tt class=
"literal"><span class=
"pre">T
</span></tt></td>
65 <td>The element to be inserted.
</td>
70 <div class=
"section" id=
"id350">
71 <h3><a class=
"subsection-title" href=
"#expression-semantics" name=
"expression-semantics">Expression semantics
</a></h3>
72 <p>For any
<a class=
"reference internal" href=
"./front-extensible-sequence.html">Front Extensible Sequence
</a> <tt class=
"literal"><span class=
"pre">s
</span></tt> and arbitrary type
<tt class=
"literal"><span class=
"pre">x
</span></tt>:
</p>
73 <pre class=
"literal-block">
74 typedef
<a href=
"./push-front.html" class=
"identifier">push_front
</a><s,x
>::type r;
76 <table class=
"docutils field-list" frame=
"void" rules=
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77 <col class=
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78 <col class=
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80 <tr class=
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</a>.
</p>
83 <tr class=
"field"><th class=
"field-name">Semantics:
</th><td class=
"field-body"><p class=
"first">Equivalent to
</p>
84 <pre class=
"literal-block">
85 typedef
<a href=
"./insert.html" class=
"identifier">insert
</a>< s,
<a href=
"./begin.html" class=
"identifier">begin
</a><s
>::type,x
>::type r;
89 <tr class=
"field"><th class=
"field-name">Postcondition:
</th><td class=
"field-body"><p class=
"first last"><tt class=
"literal"><span class=
"pre"><a href=
"./size.html" class=
"identifier">size
</a><r
>::value
</span> <span class=
"pre">==
</span> <span class=
"pre"><a href=
"./size.html" class=
"identifier">size
</a><s
>::value
</span> <span class=
"pre">+
</span> <span class=
"pre">1</span></tt>;
90 <tt class=
"literal"><span class=
"pre"><a href=
"./front.html" class=
"identifier">front
</a><r
>::type
</span></tt> is identical to
<tt class=
"literal"><span class=
"pre">x
</span></tt>.
</p>
96 <div class=
"section" id=
"id351">
97 <h3><a class=
"subsection-title" href=
"#complexity" name=
"complexity">Complexity
</a></h3>
98 <p>Amortized constant time.
</p>
100 <div class=
"section" id=
"id352">
101 <h3><a class=
"subsection-title" href=
"#example" name=
"example">Example
</a></h3>
102 <pre class=
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103 typedef
<a href=
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"identifier">vector_c
</a><int,
1,
2,
3,
5,
8,
13,
21> v;
104 <a href=
"./assert-relation.html" class=
"identifier">BOOST_MPL_ASSERT_RELATION
</a>(
<a href=
"./size.html" class=
"identifier">size
</a><v
>::value, ==,
7 );
106 typedef
<a href=
"./push-front.html" class=
"identifier">push_front
</a>< v,
<a href=
"./integral-c.html" class=
"identifier">integral_c
</a><int,
1> >::type fibonacci;
107 <a href=
"./assert-relation.html" class=
"identifier">BOOST_MPL_ASSERT_RELATION
</a>(
<a href=
"./size.html" class=
"identifier">size
</a><fibonacci
>::value, ==,
8 );
109 <a href=
"./assert.html" class=
"identifier">BOOST_MPL_ASSERT
</a>((
<a href=
"./equal.html" class=
"identifier">equal
</a><
111 ,
<a href=
"./vector-c.html" class=
"identifier">vector_c
</a><int,
1,
1,
2,
3,
5,
8,
13,
21>
112 ,
<a href=
"./equal-to.html" class=
"identifier">equal_to
</a><_,_
>
116 <div class=
"section" id=
"id353">
117 <h3><a class=
"subsection-title" href=
"#see-also" name=
"see-also">See also
</a></h3>
118 <p><a class=
"reference internal" href=
"./front-extensible-sequence.html">Front Extensible Sequence
</a>,
<a class=
"reference internal" href=
"./insert.html">insert
</a>,
<a class=
"reference internal" href=
"./pop-front.html">pop_front
</a>,
<a class=
"reference internal" href=
"./front.html">front
</a>,
<a class=
"reference internal" href=
"./push-back.html">push_back
</a></p>
119 <!-- Sequences/Intrinsic Metafunctions//sequence_tag -->
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125 <td><div class=
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2001-
2009 Aleksey Gurtovoy and David Abrahams
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126 Distributed under the Boost Software License, Version
1.0. (See accompanying
127 file LICENSE_1_0.txt or copy at
<a class=
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"http://www.boost.org/LICENSE_1_0.txt" target=
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