174 lines
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174 lines
11 KiB
HTML
<?xml version="1.0" encoding="utf-8" ?>
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
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<meta name="generator" content="Docutils 0.7: http://docutils.sourceforge.net/" />
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<title>The MPL Reference Manual: reverse_fold</title>
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<link rel="stylesheet" href="../style.css" type="text/css" />
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</head>
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<body class="docframe refmanual">
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<table class="header"><tr class="header"><td class="header-group navigation-bar"><span class="navigation-group"><a href="./iter-fold.html" class="navigation-link">Prev</a> <a href="./reverse-iter-fold.html" class="navigation-link">Next</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./iter-fold.html" class="navigation-link">Back</a> <a href="./reverse-iter-fold.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>
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<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-fold.html" class="navigation-link">reverse_fold</a></td>
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</tr></table><div class="header-separator"></div>
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<div class="section" id="reverse-fold">
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<h1><a class="toc-backref" href="./iteration-algorithms.html#id1471">reverse_fold</a></h1>
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<div class="section" id="id509">
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<h3><a class="subsection-title" href="#synopsis" name="synopsis">Synopsis</a></h3>
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<pre class="literal-block">
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template<
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typename Sequence
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, typename State
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, typename BackwardOp
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, typename ForwardOp = <a href="./placeholders.html" class="identifier">_1</a>
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>
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struct <a href="./reverse-fold.html" class="identifier">reverse_fold</a>
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{
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typedef <em>unspecified</em> type;
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};
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</pre>
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</div>
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<div class="section" id="id510">
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<h3><a class="subsection-title" href="#description" name="description">Description</a></h3>
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<p>Returns the result of the successive application of binary <tt class="literal"><span class="pre">BackwardOp</span></tt> to the
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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)
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and every element 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
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reverse order. If <tt class="literal"><span class="pre">ForwardOp</span></tt> is provided, then it is applied on forward
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traversal to form the result that is passed to the first <tt class="literal"><span class="pre">BackwardOp</span></tt> call.</p>
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</div>
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<div class="section" id="id511">
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<h3><a class="subsection-title" href="#header" name="header">Header</a></h3>
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<pre class="literal-block">
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#include <<a href="../../../../boost/mpl/reverse_fold.hpp" class="header">boost/mpl/reverse_fold.hpp</a>>
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</pre>
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</div>
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<div class="section" id="id512">
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<h3><a class="subsection-title" href="#parameters" name="parameters">Parameters</a></h3>
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</div>
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<div class="section" id="id513">
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<h3><a class="subsection-title" href="#parameters" name="parameters">Parameters</a></h3>
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<table border="1" class="docutils table">
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<colgroup>
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<col width="16%" />
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<col width="33%" />
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<col width="51%" />
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</colgroup>
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<thead valign="bottom">
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<tr><th class="head">Parameter</th>
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<th class="head">Requirement</th>
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<th class="head">Description</th>
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</tr>
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</thead>
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<tbody valign="top">
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<tr><td><tt class="literal"><span class="pre">Sequence</span></tt></td>
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<td><a class="reference internal" href="./forward-sequence.html">Forward Sequence</a></td>
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<td>A sequence to iterate.</td>
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</tr>
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<tr><td><tt class="literal"><span class="pre">State</span></tt></td>
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<td>Any type</td>
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<td>The initial state for the first <tt class="literal"><span class="pre">BackwardOp</span></tt>
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/ <tt class="literal"><span class="pre">ForwardOp</span></tt> application.</td>
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</tr>
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<tr><td><tt class="literal"><span class="pre">BackwardOp</span></tt></td>
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<td>Binary <a class="reference internal" href="./lambda-expression.html">Lambda Expression</a></td>
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<td>The operation to be executed on backward
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traversal.</td>
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</tr>
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<tr><td><tt class="literal"><span class="pre">ForwardOp</span></tt></td>
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<td>Binary <a class="reference internal" href="./lambda-expression.html">Lambda Expression</a></td>
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<td>The operation to be executed on forward
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traversal.</td>
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</tr>
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</tbody>
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</table>
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</div>
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<div class="section" id="id514">
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<h3><a class="subsection-title" href="#expression-semantics" name="expression-semantics">Expression semantics</a></h3>
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<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>,
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and arbitrary type <tt class="literal"><span class="pre">state</span></tt>:</p>
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<pre class="literal-block">
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typedef <a href="./reverse-fold.html" class="identifier">reverse_fold</a>< s,state,backward_op >::type t;
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</pre>
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<table class="docutils field-list" frame="void" rules="none">
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<col class="field-name" />
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<col class="field-body" />
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<tbody valign="top">
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<tr class="field"><th class="field-name">Return type:</th><td class="field-body"><p class="first">A type</p>
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</td>
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</tr>
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<tr class="field"><th class="field-name">Semantics:</th><td class="field-body"><p class="first">Equivalent to</p>
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<pre class="last literal-block">
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typedef <a href="./lambda.html" class="identifier">lambda</a><backward_op>::type op;
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typedef <a href="./reverse-iter-fold.html" class="identifier">reverse_iter_fold</a><
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s
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, state
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, apply_wrap2< op, <a href="./placeholders.html" class="identifier">_1</a>, <a href="./deref.html" class="identifier">deref</a><<a href="./placeholders.html" class="identifier">_2</a>> >
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>::type t;
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</pre>
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</td>
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</tr>
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</tbody>
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</table>
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<!-- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ -->
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<pre class="literal-block">
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typedef <a href="./reverse-fold.html" class="identifier">reverse_fold</a>< s,state,backward_op,forward_op >::type t;
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</pre>
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<table class="docutils field-list" frame="void" rules="none">
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<col class="field-name" />
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<col class="field-body" />
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<tbody valign="top">
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<tr class="field"><th class="field-name">Return type:</th><td class="field-body"><p class="first">A type.</p>
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</td>
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</tr>
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<tr class="field"><th class="field-name">Semantics:</th><td class="field-body"><p class="first">Equivalent to</p>
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<pre class="last literal-block">
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typedef <a href="./reverse-fold.html" class="identifier">reverse_fold</a><
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Sequence
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, <a href="./fold.html" class="identifier">fold</a><s,state,forward_op>::type
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, backward_op
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>::type t;
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</pre>
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</td>
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</tr>
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</tbody>
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</table>
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</div>
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<div class="section" id="id515">
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<h3><a class="subsection-title" href="#complexity" name="complexity">Complexity</a></h3>
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<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>
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</div>
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<div class="section" id="id516">
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<h3><a class="subsection-title" href="#example" name="example">Example</a></h3>
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<p>Remove non-negative elements from a sequence <a class="footnote-reference" href="#reverse-fold-note" id="id517">[2]</a>.</p>
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<pre class="literal-block">
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typedef <a href="./list-c.html" class="identifier">list_c</a><int,5,-1,0,-7,-2,0,-5,4> numbers;
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typedef <a href="./list-c.html" class="identifier">list_c</a><int,-1,-7,-2,-5> negatives;
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typedef <a href="./reverse-fold.html" class="identifier">reverse_fold</a><
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numbers
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, <a href="./list-c.html" class="identifier">list_c</a><int>
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, <a href="./if.html" class="identifier">if_</a>< <a href="./less.html" class="identifier">less</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> >
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>::type result;
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<a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( <a href="./equal.html" class="identifier">equal</a>< negatives,result > ));
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</pre>
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<table class="docutils footnote" frame="void" id="reverse-fold-note" rules="none">
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<colgroup><col class="label" /><col /></colgroup>
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<tbody valign="top">
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<tr><td class="label"><a class="fn-backref" href="#id517">[2]</a></td><td>See <tt class="literal"><span class="pre"><a href="./remove-if.html" class="identifier">remove_if</a></span></tt> for a more compact way to do this.</td></tr>
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</tbody>
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</table>
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</div>
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<div class="section" id="id518">
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<h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3>
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<p><a class="reference internal" href="./algorithms.html">Algorithms</a>, <a class="reference internal" href="./fold.html">fold</a>, <a class="reference internal" href="./reverse-iter-fold.html">reverse_iter_fold</a>, <a class="reference internal" href="./iter-fold.html">iter_fold</a></p>
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<!-- Algorithms/Iteration Algorithms//reverse_iter_fold -->
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</div>
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</div>
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<table class="footer"><tr class="footer"><td class="header-group navigation-bar"><span class="navigation-group"><a href="./iter-fold.html" class="navigation-link">Prev</a> <a href="./reverse-iter-fold.html" class="navigation-link">Next</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./iter-fold.html" class="navigation-link">Back</a> <a href="./reverse-iter-fold.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>
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<td><div class="copyright-footer"><div class="copyright">Copyright © 2001-2009 Aleksey Gurtovoy and David Abrahams</div>
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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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>
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