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7 | <title>The MPL Reference Manual: reverse_iter_fold</title> | |
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10 | <body class="docframe refmanual"> | |
11 | <table class="header"><tr class="header"><td class="header-group navigation-bar"><span class="navigation-group"><a href="./reverse-fold.html" class="navigation-link">Prev</a> <a href="./accumulate.html" class="navigation-link">Next</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./reverse-fold.html" class="navigation-link">Back</a> <a href="./accumulate.html" class="navigation-link">Along</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./iteration-algorithms.html" class="navigation-link">Up</a> <a href="../refmanual.html" class="navigation-link">Home</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./refmanual_toc.html" class="navigation-link">Full TOC</a></span></td> | |
12 | <td class="header-group page-location"><a href="../refmanual.html" class="navigation-link">Front Page</a> / <a href="./algorithms.html" class="navigation-link">Algorithms</a> / <a href="./iteration-algorithms.html" class="navigation-link">Iteration Algorithms</a> / <a href="./reverse-iter-fold.html" class="navigation-link">reverse_iter_fold</a></td> | |
13 | </tr></table><div class="header-separator"></div> | |
14 | <div class="section" id="reverse-iter-fold"> | |
15 | <h1><a class="toc-backref" href="./iteration-algorithms.html#id1472">reverse_iter_fold</a></h1> | |
16 | <div class="section" id="id519"> | |
17 | <h3><a class="subsection-title" href="#synopsis" name="synopsis">Synopsis</a></h3> | |
18 | <pre class="literal-block"> | |
19 | template< | |
20 | typename Sequence | |
21 | , typename State | |
22 | , typename BackwardOp | |
23 | , typename ForwardOp = <a href="./placeholders.html" class="identifier">_1</a> | |
24 | > | |
25 | struct <a href="./reverse-iter-fold.html" class="identifier">reverse_iter_fold</a> | |
26 | { | |
27 | typedef <em>unspecified</em> type; | |
28 | }; | |
29 | </pre> | |
30 | </div> | |
31 | <div class="section" id="id520"> | |
32 | <h3><a class="subsection-title" href="#description" name="description">Description</a></h3> | |
33 | <p>Returns the result of the successive application of binary <tt class="literal"><span class="pre">BackwardOp</span></tt> to the | |
34 | result of the previous <tt class="literal"><span class="pre">BackwardOp</span></tt> invocation (<tt class="literal"><span class="pre">State</span></tt> if it's the first call) | |
35 | and each 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>) | |
36 | in reverse order. If <tt class="literal"><span class="pre">ForwardOp</span></tt> is provided, then it's applied on forward | |
37 | traversal to form the result which is passed to the first <tt class="literal"><span class="pre">BackwardOp</span></tt> call.</p> | |
38 | </div> | |
39 | <div class="section" id="id521"> | |
40 | <h3><a class="subsection-title" href="#header" name="header">Header</a></h3> | |
41 | <pre class="literal-block"> | |
42 | #include <<a href="../../../../boost/mpl/reverse_iter_fold.hpp" class="header">boost/mpl/reverse_iter_fold.hpp</a>> | |
43 | </pre> | |
44 | </div> | |
45 | <div class="section" id="id522"> | |
46 | <h3><a class="subsection-title" href="#parameters" name="parameters">Parameters</a></h3> | |
47 | <table border="1" class="docutils table"> | |
48 | <colgroup> | |
49 | <col width="16%" /> | |
50 | <col width="33%" /> | |
51 | <col width="51%" /> | |
52 | </colgroup> | |
53 | <thead valign="bottom"> | |
54 | <tr><th class="head">Parameter</th> | |
55 | <th class="head">Requirement</th> | |
56 | <th class="head">Description</th> | |
57 | </tr> | |
58 | </thead> | |
59 | <tbody valign="top"> | |
60 | <tr><td><tt class="literal"><span class="pre">Sequence</span></tt></td> | |
61 | <td><a class="reference internal" href="./forward-sequence.html">Forward Sequence</a></td> | |
62 | <td>A sequence to iterate.</td> | |
63 | </tr> | |
64 | <tr><td><tt class="literal"><span class="pre">State</span></tt></td> | |
65 | <td>Any type</td> | |
66 | <td>The initial state for the first <tt class="literal"><span class="pre">BackwardOp</span></tt> | |
67 | / <tt class="literal"><span class="pre">ForwardOp</span></tt> application.</td> | |
68 | </tr> | |
69 | <tr><td><tt class="literal"><span class="pre">BackwardOp</span></tt></td> | |
70 | <td>Binary <a class="reference internal" href="./lambda-expression.html">Lambda Expression</a></td> | |
71 | <td>The operation to be executed on backward | |
72 | traversal.</td> | |
73 | </tr> | |
74 | <tr><td><tt class="literal"><span class="pre">ForwardOp</span></tt></td> | |
75 | <td>Binary <a class="reference internal" href="./lambda-expression.html">Lambda Expression</a></td> | |
76 | <td>The operation to be executed on forward | |
77 | traversal.</td> | |
78 | </tr> | |
79 | </tbody> | |
80 | </table> | |
81 | </div> | |
82 | <div class="section" id="id523"> | |
83 | <h3><a class="subsection-title" href="#expression-semantics" name="expression-semantics">Expression semantics</a></h3> | |
84 | <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">backward_op</span></tt> and <tt class="literal"><span class="pre">forward_op</span></tt>, | |
85 | and arbitrary type <tt class="literal"><span class="pre">state</span></tt>:</p> | |
86 | <pre class="literal-block"> | |
87 | typedef <a href="./reverse-iter-fold.html" class="identifier">reverse_iter_fold</a>< s,state,backward_op >::type t; | |
88 | </pre> | |
89 | <table class="docutils field-list" frame="void" rules="none"> | |
90 | <col class="field-name" /> | |
91 | <col class="field-body" /> | |
92 | <tbody valign="top"> | |
93 | <tr class="field"><th class="field-name">Return type:</th><td class="field-body"><p class="first">A type.</p> | |
94 | </td> | |
95 | </tr> | |
96 | <tr class="field"><th class="field-name">Semantics:</th><td class="field-body"><p class="first">Equivalent to</p> | |
97 | <pre class="literal-block"> | |
98 | typedef <a href="./begin.html" class="identifier">begin</a><s>::type i<sub>1</sub>; | |
99 | typedef <a href="./next.html" class="identifier">next</a><i<sub>1</sub>>::type i<sub>2</sub>; | |
100 | <em>...</em> | |
101 | typedef <a href="./next.html" class="identifier">next</a><i<sub>n</sub>>::type last; | |
102 | typedef <a href="./apply.html" class="identifier">apply</a><backward_op,state,i<sub>n</sub>>::type state<sub>n</sub>; | |
103 | typedef <a href="./apply.html" class="identifier">apply</a><backward_op,state<sub>n</sub>,i<sub>n-1</sub>>::type state<sub>n-1</sub>; | |
104 | <em>...</em> | |
105 | typedef <a href="./apply.html" class="identifier">apply</a><backward_op,state<sub>2</sub>,i<sub>1</sub>>::type state<sub>1</sub>; | |
106 | typedef state<sub>1</sub> t; | |
107 | </pre> | |
108 | <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 | |
109 | 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> | |
110 | </td> | |
111 | </tr> | |
112 | </tbody> | |
113 | </table> | |
114 | <!-- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ --> | |
115 | <pre class="literal-block"> | |
116 | typedef <a href="./reverse-iter-fold.html" class="identifier">reverse_iter_fold</a>< s,state,backward_op,forward_op >::type t; | |
117 | </pre> | |
118 | <table class="docutils field-list" frame="void" rules="none"> | |
119 | <col class="field-name" /> | |
120 | <col class="field-body" /> | |
121 | <tbody valign="top"> | |
122 | <tr class="field"><th class="field-name">Return type:</th><td class="field-body"><p class="first">A type.</p> | |
123 | </td> | |
124 | </tr> | |
125 | <tr class="field"><th class="field-name">Semantics:</th><td class="field-body"><p class="first">Equivalent to</p> | |
126 | <pre class="last literal-block"> | |
127 | typedef <a href="./reverse-iter-fold.html" class="identifier">reverse_iter_fold</a>< | |
128 | Sequence | |
129 | , <a href="./iter-fold.html" class="identifier">iter_fold</a><s,state,forward_op>::type | |
130 | , backward_op | |
131 | >::type t; | |
132 | </pre> | |
133 | </td> | |
134 | </tr> | |
135 | </tbody> | |
136 | </table> | |
137 | </div> | |
138 | <div class="section" id="id524"> | |
139 | <h3><a class="subsection-title" href="#complexity" name="complexity">Complexity</a></h3> | |
140 | <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">backward_op</span></tt> and <tt class="literal"><span class="pre">forward_op</span></tt>.</p> | |
141 | </div> | |
142 | <div class="section" id="id525"> | |
143 | <h3><a class="subsection-title" href="#example" name="example">Example</a></h3> | |
144 | <p>Build a list of iterators to the negative elements in a sequence.</p> | |
145 | <pre class="literal-block"> | |
146 | typedef <a href="./vector-c.html" class="identifier">vector_c</a><int,5,-1,0,-7,-2,0,-5,4> numbers; | |
147 | typedef <a href="./list-c.html" class="identifier">list_c</a><int,-1,-7,-2,-5> negatives; | |
148 | typedef <a href="./reverse-iter-fold.html" class="identifier">reverse_iter_fold</a>< | |
149 | numbers | |
150 | , <a href="./list.html" class="identifier">list</a><> | |
151 | , <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">_2</a>>,<a href="./int.html" class="identifier">int_</a><0> >, <a href="./push-front.html" class="identifier">push_front</a><<a href="./placeholders.html" class="identifier">_1</a>,<a href="./placeholders.html" class="identifier">_2</a>>, <a href="./placeholders.html" class="identifier">_1</a> > | |
152 | >::type iters; | |
153 | ||
154 | <a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( <a href="./equal.html" class="identifier">equal</a>< | |
155 | negatives | |
156 | , <a href="./transform-view.html" class="identifier">transform_view</a>< iters,<a href="./deref.html" class="identifier">deref</a><<a href="./placeholders.html" class="identifier">_1</a>> > | |
157 | > )); | |
158 | </pre> | |
159 | </div> | |
160 | <div class="section" id="id526"> | |
161 | <h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3> | |
162 | <p><a class="reference internal" href="./algorithms.html">Algorithms</a>, <a class="reference internal" href="./iter-fold.html">iter_fold</a>, <a class="reference internal" href="./reverse-fold.html">reverse_fold</a>, <a class="reference internal" href="./fold.html">fold</a></p> | |
163 | <!-- Algorithms/Iteration Algorithms//accumulate |10 --> | |
164 | </div> | |
165 | </div> | |
166 | ||
167 | <div class="footer-separator"></div> | |
168 | <table class="footer"><tr class="footer"><td class="header-group navigation-bar"><span class="navigation-group"><a href="./reverse-fold.html" class="navigation-link">Prev</a> <a href="./accumulate.html" class="navigation-link">Next</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./reverse-fold.html" class="navigation-link">Back</a> <a href="./accumulate.html" class="navigation-link">Along</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./iteration-algorithms.html" class="navigation-link">Up</a> <a href="../refmanual.html" class="navigation-link">Home</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./refmanual_toc.html" class="navigation-link">Full TOC</a></span></td> | |
169 | <td><div class="copyright-footer"><div class="copyright">Copyright © 2001-2009 Aleksey Gurtovoy and David Abrahams</div> | |
170 | Distributed under the Boost Software License, Version 1.0. (See accompanying | |
171 | 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>)</div></td></tr></table></body> | |
172 | </html> |