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7 <title>The MPL Reference Manual: iter_fold
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14 <div class=
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"iter-fold">
15 <h1><a class=
"toc-backref" href=
"./iteration-algorithms.html#id1470">iter_fold
</a></h1>
16 <div class=
"section" id=
"id501">
17 <h3><a class=
"subsection-title" href=
"#synopsis" name=
"synopsis">Synopsis
</a></h3>
18 <pre class=
"literal-block">
24 struct
<a href=
"./iter-fold.html" class=
"identifier">iter_fold
</a>
26 typedef
<em>unspecified
</em> type;
30 <div class=
"section" id=
"id502">
31 <h3><a class=
"subsection-title" href=
"#description" name=
"description">Description
</a></h3>
32 <p>Returns the result of the successive application of binary
<tt class=
"literal"><span class=
"pre">ForwardOp
</span></tt> to the result
33 of the previous
<tt class=
"literal"><span class=
"pre">ForwardOp
</span></tt> invocation (
<tt class=
"literal"><span class=
"pre">State
</span></tt> if it's the first call) and each
34 iterator in the range [
<tt class=
"literal"><span class=
"pre"><a href=
"./begin.html" class=
"identifier">begin
</a><Sequence
>::type
</span></tt>,
<tt class=
"literal"><span class=
"pre"><a href=
"./end.html" class=
"identifier">end
</a><Sequence
>::type
</span></tt>) in order.
</p>
36 <div class=
"section" id=
"id503">
37 <h3><a class=
"subsection-title" href=
"#header" name=
"header">Header
</a></h3>
38 <pre class=
"literal-block">
39 #include
<<a href=
"../../../../boost/mpl/iter_fold.hpp" class=
"header">boost/mpl/iter_fold.hpp
</a>>
42 <div class=
"section" id=
"id504">
43 <h3><a class=
"subsection-title" href=
"#parameters" name=
"parameters">Parameters
</a></h3>
44 <table border=
"1" class=
"docutils table">
50 <thead valign=
"bottom">
51 <tr><th class=
"head">Parameter
</th>
52 <th class=
"head">Requirement
</th>
53 <th class=
"head">Description
</th>
57 <tr><td><tt class=
"literal"><span class=
"pre">Sequence
</span></tt></td>
58 <td><a class=
"reference internal" href=
"./forward-sequence.html">Forward Sequence
</a></td>
59 <td>A sequence to iterate.
</td>
61 <tr><td><tt class=
"literal"><span class=
"pre">State
</span></tt></td>
63 <td>The initial state for the first
<tt class=
"literal"><span class=
"pre">ForwardOp
</span></tt>
66 <tr><td><tt class=
"literal"><span class=
"pre">ForwardOp
</span></tt></td>
67 <td>Binary
<a class=
"reference internal" href=
"./lambda-expression.html">Lambda Expression
</a></td>
68 <td>The operation to be executed on forward
74 <div class=
"section" id=
"id505">
75 <h3><a class=
"subsection-title" href=
"#expression-semantics" name=
"expression-semantics">Expression semantics
</a></h3>
76 <p>For any
<a class=
"reference internal" href=
"./forward-sequence.html">Forward Sequence
</a> <tt class=
"literal"><span class=
"pre">s
</span></tt>, binary
<a class=
"reference internal" href=
"./lambda-expression.html">Lambda Expression
</a> <tt class=
"literal"><span class=
"pre">op
</span></tt>, and an
77 arbitrary type
<tt class=
"literal"><span class=
"pre">state
</span></tt>:
</p>
78 <pre class=
"literal-block">
79 typedef
<a href=
"./iter-fold.html" class=
"identifier">iter_fold
</a><s,state,op
>::type t;
81 <table class=
"docutils field-list" frame=
"void" rules=
"none">
82 <col class=
"field-name" />
83 <col class=
"field-body" />
85 <tr class=
"field"><th class=
"field-name">Return type:
</th><td class=
"field-body"><p class=
"first">A type.
</p>
88 <tr class=
"field"><th class=
"field-name">Semantics:
</th><td class=
"field-body"><p class=
"first">Equivalent to
</p>
89 <pre class=
"literal-block">
90 typedef
<a href=
"./begin.html" class=
"identifier">begin
</a><s
>::type i
<sub>1</sub>;
91 typedef
<a href=
"./apply.html" class=
"identifier">apply
</a><op,state,i
<sub>1</sub>>::type state
<sub>1</sub>;
92 typedef
<a href=
"./next.html" class=
"identifier">next
</a><i
<sub>1</sub>>::type i
<sub>2</sub>;
93 typedef
<a href=
"./apply.html" class=
"identifier">apply
</a><op,state
<sub>1</sub>,i
<sub>2</sub>>::type state
<sub>2</sub>;
95 typedef
<a href=
"./apply.html" class=
"identifier">apply
</a><op,state
<sub>n-
1</sub>,i
<sub>n
</sub>>::type state
<sub>n
</sub>;
96 typedef
<a href=
"./next.html" class=
"identifier">next
</a><i
<sub>n
</sub>>::type last;
97 typedef state
<sub>n
</sub> t;
99 <p class=
"last">where
<tt class=
"literal"><span class=
"pre">n
</span> <span class=
"pre">==
</span> <span class=
"pre"><a href=
"./size.html" class=
"identifier">size
</a><s
>::value
</span></tt> and
<tt class=
"literal"><span class=
"pre">last
</span></tt> is identical to
<tt class=
"literal"><span class=
"pre"><a href=
"./end.html" class=
"identifier">end
</a><s
>::type
</span></tt>; equivalent
100 to
<tt class=
"literal"><span class=
"pre">typedef
</span> <span class=
"pre">state
</span> <span class=
"pre">t;
</span></tt> if
<tt class=
"literal"><span class=
"pre"><a href=
"./empty.html" class=
"identifier">empty
</a><s
>::value
</span> <span class=
"pre">==
</span> <span class=
"pre">true
</span></tt>.
</p>
106 <div class=
"section" id=
"id506">
107 <h3><a class=
"subsection-title" href=
"#complexity" name=
"complexity">Complexity
</a></h3>
108 <p>Linear. Exactly
<tt class=
"literal"><span class=
"pre"><a href=
"./size.html" class=
"identifier">size
</a><s
>::value
</span></tt> applications of
<tt class=
"literal"><span class=
"pre">op
</span></tt>.
</p>
110 <div class=
"section" id=
"id507">
111 <h3><a class=
"subsection-title" href=
"#example" name=
"example">Example
</a></h3>
112 <pre class=
"literal-block">
113 typedef
<a href=
"./vector-c.html" class=
"identifier">vector_c
</a><int,
5,-
1,
0,
7,
2,
0,-
5,
4> numbers;
114 typedef
<a href=
"./iter-fold.html" class=
"identifier">iter_fold
</a><
116 ,
<a href=
"./begin.html" class=
"identifier">begin
</a><numbers
>::type
117 ,
<a href=
"./if.html" class=
"identifier">if_
</a>< <a href=
"./less.html" class=
"identifier">less
</a>< <a href=
"./deref.html" class=
"identifier">deref
</a><<a href=
"./placeholders.html" class=
"identifier">_1
</a>>,
<a href=
"./deref.html" class=
"identifier">deref
</a><<a href=
"./placeholders.html" class=
"identifier">_2
</a>> >,
<a href=
"./placeholders.html" class=
"identifier">_2
</a>,
<a href=
"./placeholders.html" class=
"identifier">_1
</a> >
118 >::type max_element_iter;
120 <a href=
"./assert-relation.html" class=
"identifier">BOOST_MPL_ASSERT_RELATION
</a>(
<a href=
"./deref.html" class=
"identifier">deref
</a><max_element_iter
>::type::value, ==,
7 );
123 <div class=
"section" id=
"id508">
124 <h3><a class=
"subsection-title" href=
"#see-also" name=
"see-also">See also
</a></h3>
125 <p><a class=
"reference internal" href=
"./algorithms.html">Algorithms
</a>,
<a class=
"reference internal" href=
"./reverse-iter-fold.html">reverse_iter_fold
</a>,
<a class=
"reference internal" href=
"./fold.html">fold
</a>,
<a class=
"reference internal" href=
"./reverse-fold.html">reverse_fold
</a>,
<a class=
"reference internal" href=
"./copy.html">copy
</a></p>
126 <!-- Algorithms/Iteration Algorithms//reverse_fold -->
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132 <td><div class=
"copyright-footer"><div class=
"copyright">Copyright ©
2001-
2009 Aleksey Gurtovoy and David Abrahams
</div>
133 Distributed under the Boost Software License, Version
1.0. (See accompanying
134 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
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