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14 <div class=
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"prior">
15 <h1><a class=
"toc-backref" href=
"./iterator-metafunctions.html#id1457">prior
</a></h1>
16 <div class=
"section" id=
"id429">
17 <h3><a class=
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"#synopsis" name=
"synopsis">Synopsis
</a></h3>
18 <pre class=
"literal-block">
22 struct
<a href=
"./prior.html" class=
"identifier">prior
</a>
24 typedef
<em>unspecified
</em> type;
28 <div class=
"section" id=
"id430">
29 <h3><a class=
"subsection-title" href=
"#description" name=
"description">Description
</a></h3>
30 <p>Returns the previous iterator in the sequence. [
<em>Note:
</em> <tt class=
"literal"><span class=
"pre"><a href=
"./prior.html" class=
"identifier">prior
</a></span></tt> has a number of
31 overloaded meanings, depending on the type of its argument. For instance,
32 if
<tt class=
"literal"><span class=
"pre">X
</span></tt> is an
<a class=
"reference internal" href=
"./integral-constant.html">Integral Constant
</a>,
<tt class=
"literal"><span class=
"pre"><a href=
"./prior.html" class=
"identifier">prior
</a><X
></span></tt> returns an decremented
33 <a class=
"reference internal" href=
"./integral-constant.html">Integral Constant
</a> of the same type. The following specification is
34 iterator-specific. Please refer to the corresponding concept's
35 documentation for the details of the alternative semantics —
<em>end note
</em>].
</p>
37 <div class=
"section" id=
"id431">
38 <h3><a class=
"subsection-title" href=
"#header" name=
"header">Header
</a></h3>
39 <pre class=
"literal-block">
40 #include
<<a href=
"../../../../boost/mpl/next_prior.hpp" class=
"header">boost/mpl/next_prior.hpp
</a>>
43 <div class=
"section" id=
"id432">
44 <h3><a class=
"subsection-title" href=
"#parameters" name=
"parameters">Parameters
</a></h3>
45 <table border=
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51 <thead valign=
"bottom">
52 <tr><th class=
"head">Parameter
</th>
53 <th class=
"head">Requirement
</th>
54 <th class=
"head">Description
</th>
58 <tr><td><tt class=
"literal"><span class=
"pre">Iterator
</span></tt></td>
59 <td><a class=
"reference internal" href=
"./bidirectional-iterator.html">Bidirectional Iterator
</a>.
</td>
60 <td>An iterator to decrement.
</td>
65 <div class=
"section" id=
"id433">
66 <h3><a class=
"subsection-title" href=
"#expression-semantics" name=
"expression-semantics">Expression semantics
</a></h3>
67 <p>For any
<a class=
"reference internal" href=
"./bidirectional-iterator.html">Bidirectional Iterator
</a>s
<tt class=
"literal"><span class=
"pre">iter
</span></tt>:
</p>
68 <pre class=
"literal-block">
69 typedef
<a href=
"./prior.html" class=
"identifier">prior
</a><iter
>::type j;
71 <table class=
"docutils field-list" frame=
"void" rules=
"none">
72 <col class=
"field-name" />
73 <col class=
"field-body" />
75 <tr class=
"field"><th class=
"field-name">Return type:
</th><td class=
"field-body"><p class=
"first"><a class=
"reference internal" href=
"./bidirectional-iterator.html">Bidirectional Iterator
</a>.
</p>
78 <tr class=
"field"><th class=
"field-name">Precondition:
</th><td class=
"field-body"><p class=
"first"><tt class=
"literal"><span class=
"pre">iter
</span></tt> is decrementable.
</p>
81 <tr class=
"field"><th class=
"field-name">Semantics:
</th><td class=
"field-body"><p class=
"first"><tt class=
"literal"><span class=
"pre">j
</span></tt> is an iterator pointing to the previous element in the sequence.
82 If
<tt class=
"literal"><span class=
"pre">iter
</span></tt> is a user-defined iterator, the library-provided default
83 implementation is equivalent to
</p>
84 <pre class=
"last literal-block">
85 typedef iter::
<a href=
"./prior.html" class=
"identifier">prior
</a> j;
92 <div class=
"section" id=
"id434">
93 <h3><a class=
"subsection-title" href=
"#complexity" name=
"complexity">Complexity
</a></h3>
94 <p>Amortized constant time.
</p>
96 <div class=
"section" id=
"id435">
97 <h3><a class=
"subsection-title" href=
"#example" name=
"example">Example
</a></h3>
98 <pre class=
"literal-block">
99 typedef
<a href=
"./vector-c.html" class=
"identifier">vector_c
</a><int,
1> v;
100 typedef
<a href=
"./begin.html" class=
"identifier">begin
</a><v
>::type first;
101 typedef
<a href=
"./end.html" class=
"identifier">end
</a><v
>::type last;
103 <a href=
"./assert.html" class=
"identifier">BOOST_MPL_ASSERT
</a>(( is_same
< <a href=
"./prior.html" class=
"identifier">prior
</a><last
>::type, first
> ));
106 <div class=
"section" id=
"id436">
107 <h3><a class=
"subsection-title" href=
"#see-also" name=
"see-also">See also
</a></h3>
108 <p><a class=
"reference internal" href=
"./iterators.html">Iterators
</a>,
<a class=
"reference internal" href=
"./begin.html">begin
</a> /
<a class=
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"./end.html">end
</a>,
<a class=
"reference internal" href=
"./next.html">next
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<a class=
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"./deref.html">deref
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109 <!-- Iterators/Iterator Metafunctions//deref |50 -->
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115 <td><div class=
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2001-
2009 Aleksey Gurtovoy and David Abrahams
</div>
116 Distributed under the Boost Software License, Version
1.0. (See accompanying
117 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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