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- <title>The MPL Reference Manual: reverse_transform</title>
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- <div class="section" id="reverse-transform">
- <h1><a class="toc-backref" href="./transformation-algorithms.html#id1500">reverse_transform</a></h1>
- <div class="section" id="id740">
- <h3><a class="subsection-title" href="#synopsis" name="synopsis">Synopsis</a></h3>
- <pre class="literal-block">
- template<
- typename Seq
- , typename Op
- , typename In = <em>unspecified</em>
- >
- struct <a href="./reverse-transform.html" class="identifier">reverse_transform</a>
- {
- typedef <em>unspecified</em> type;
- };
- template<
- typename Seq1
- , typename Seq2
- , typename BinaryOp
- , typename In = <em>unspecified</em>
- >
- struct <a href="./reverse-transform.html" class="identifier">reverse_transform</a>
- {
- typedef <em>unspecified</em> type;
- };
- </pre>
- </div>
- <div class="section" id="id741">
- <h3><a class="subsection-title" href="#description" name="description">Description</a></h3>
- <p><tt class="literal"><span class="pre"><a href="./reverse-transform.html" class="identifier">reverse_transform</a></span></tt> is an <a class="reference internal" href="./terminology.html#overloaded-name">overloaded name</a>:</p>
- <ul class="simple">
- <li><tt class="literal"><span class="pre"><a href="./reverse-transform.html" class="identifier">reverse_transform</a><Seq,Op></span></tt> returns a reversed, transformed copy of the
- original sequence produced by applying an unary transformation <tt class="literal"><span class="pre">Op</span></tt> to
- every element in the [<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>) range.</li>
- <li><tt class="literal"><span class="pre"><a href="./reverse-transform.html" class="identifier">reverse_transform</a><Seq1,Seq2,Op></span></tt> returns a new sequence produced by applying a
- binary transformation <tt class="literal"><span class="pre">BinaryOp</span></tt> to a pair of elements (e<sub>1</sub>, e2<sub>1</sub>)
- from the corresponding [<tt class="literal"><span class="pre"><a href="./begin.html" class="identifier">begin</a><Seq1>::type</span></tt>, <tt class="literal"><span class="pre"><a href="./end.html" class="identifier">end</a><Seq1>::type</span></tt>) and [<tt class="literal"><span class="pre"><a href="./begin.html" class="identifier">begin</a><Seq2>::type</span></tt>, <tt class="literal"><span class="pre"><a href="./end.html" class="identifier">end</a><Seq2>::type</span></tt>) ranges in reverse
- order.</li>
- </ul>
- <p>[<em>Note:</em> This wording applies to a no-inserter version(s) of the algorithm. See the
- <cite>Expression semantics</cite> subsection for a precise specification of the algorithm's
- details in all cases — <em>end note</em>]</p>
- </div>
- <div class="section" id="id742">
- <h3><a class="subsection-title" href="#header" name="header">Header</a></h3>
- <pre class="literal-block">
- #include <<a href="../../../../boost/mpl/transform.hpp" class="header">boost/mpl/transform.hpp</a>>
- </pre>
- </div>
- <div class="section" id="id743">
- <h3><a class="subsection-title" href="#model-of" name="model-of">Model of</a></h3>
- <p><a class="reference internal" href="./reversible-algorithm.html">Reversible Algorithm</a></p>
- </div>
- <div class="section" id="id744">
- <h3><a class="subsection-title" href="#parameters" name="parameters">Parameters</a></h3>
- <table border="1" class="docutils table">
- <colgroup>
- <col width="21%" />
- <col width="39%" />
- <col width="39%" />
- </colgroup>
- <thead valign="bottom">
- <tr><th class="head">Parameter</th>
- <th class="head">Requirement</th>
- <th class="head">Description</th>
- </tr>
- </thead>
- <tbody valign="top">
- <tr><td><tt class="literal"><span class="pre">Sequence</span></tt>,
- <tt class="literal"><span class="pre">Seq1</span></tt>, <tt class="literal"><span class="pre">Seq2</span></tt></td>
- <td><a class="reference internal" href="./forward-sequence.html">Forward Sequence</a></td>
- <td>Sequences to transform.</td>
- </tr>
- <tr><td><tt class="literal"><span class="pre">Op</span></tt>,
- <tt class="literal"><span class="pre">BinaryOp</span></tt></td>
- <td><a class="reference internal" href="./lambda-expression.html">Lambda Expression</a></td>
- <td>A transformation.</td>
- </tr>
- <tr><td><tt class="literal"><span class="pre">In</span></tt></td>
- <td><a class="reference internal" href="./inserter.html">Inserter</a></td>
- <td>An inserter.</td>
- </tr>
- </tbody>
- </table>
- </div>
- <div class="section" id="id745">
- <h3><a class="subsection-title" href="#expression-semantics" name="expression-semantics">Expression semantics</a></h3>
- <p>The semantics of an expression are defined only
- where they differ from, or are not defined in <a class="reference internal" href="./reversible-algorithm.html">Reversible Algorithm</a>.</p>
- <p>For any <a class="reference internal" href="./forward-sequence.html">Forward Sequence</a>s <tt class="literal"><span class="pre">s</span></tt>, <tt class="literal"><span class="pre">s1</span></tt> and <tt class="literal"><span class="pre">s2</span></tt>, <a class="reference internal" href="./lambda-expression.html">Lambda Expression</a>s <tt class="literal"><span class="pre">op</span></tt> and <tt class="literal"><span class="pre">op2</span></tt>,
- and an <a class="reference internal" href="./inserter.html">Inserter</a> <tt class="literal"><span class="pre">in</span></tt>:</p>
- <pre class="literal-block">
- typedef <a href="./reverse-transform.html" class="identifier">reverse_transform</a><s,op,in>::type r;
- </pre>
- <table class="docutils field-list" frame="void" rules="none">
- <col class="field-name" />
- <col class="field-body" />
- <tbody valign="top">
- <tr class="field"><th class="field-name">Return type:</th><td class="field-body"><p class="first">A type.</p>
- </td>
- </tr>
- <tr class="field"><th class="field-name">Postcondition:</th><td class="field-body"><p class="first">Equivalent to</p>
- <pre class="last literal-block">
- typedef <a href="./lambda.html" class="identifier">lambda</a><op>::type f;
- typedef <a href="./lambda.html" class="identifier">lambda</a><in::operation>::type in_op;
- typedef <a href="./reverse-fold.html" class="identifier">reverse_fold</a><
- s
- , in::state
- , <a href="./bind.html" class="identifier">bind</a>< in_op, <a href="./placeholders.html" class="identifier">_1</a>, <a href="./bind.html" class="identifier">bind</a><f, <a href="./placeholders.html" class="identifier">_2</a>> >
- >::type r;
- </pre>
- </td>
- </tr>
- </tbody>
- </table>
- <pre class="literal-block">
- typedef <a href="./transform.html" class="identifier">transform</a><s1,s2,op,in>::type r;
- </pre>
- <table class="docutils field-list" frame="void" rules="none">
- <col class="field-name" />
- <col class="field-body" />
- <tbody valign="top">
- <tr class="field"><th class="field-name">Return type:</th><td class="field-body"><p class="first">A type.</p>
- </td>
- </tr>
- <tr class="field"><th class="field-name">Postcondition:</th><td class="field-body"><p class="first">Equivalent to</p>
- <pre class="last literal-block">
- typedef <a href="./lambda.html" class="identifier">lambda</a><op2>::type f;
- typedef <a href="./lambda.html" class="identifier">lambda</a><in::operation>::type in_op;
- typedef <a href="./reverse-fold.html" class="identifier">reverse_fold</a><
- pair_view<s1,s2>
- , in::state
- , <a href="./bind.html" class="identifier">bind</a><
- in_op
- , <a href="./placeholders.html" class="identifier">_1</a>
- , <a href="./bind.html" class="identifier">bind</a><f, <a href="./bind.html" class="identifier">bind</a><first<>,<a href="./placeholders.html" class="identifier">_2</a>>, <a href="./bind.html" class="identifier">bind</a><second<>,<a href="./placeholders.html" class="identifier">_2</a>> >
- >
- >::type r;
- </pre>
- </td>
- </tr>
- </tbody>
- </table>
- </div>
- <div class="section" id="id746">
- <h3><a class="subsection-title" href="#complexity" name="complexity">Complexity</a></h3>
- <p>Linear. Exactly <tt class="literal"><span class="pre"><a href="./size.html" class="identifier">size</a><s>::value</span></tt> / <tt class="literal"><span class="pre"><a href="./size.html" class="identifier">size</a><s1>::value</span></tt> applications of
- <tt class="literal"><span class="pre">op</span></tt> / <tt class="literal"><span class="pre">op2</span></tt> and <tt class="literal"><span class="pre">in::operation</span></tt>.</p>
- </div>
- <div class="section" id="id747">
- <h3><a class="subsection-title" href="#example" name="example">Example</a></h3>
- <pre class="literal-block">
- typedef <a href="./vector.html" class="identifier">vector</a><char,short,int,long,float,double> types;
- typedef <a href="./vector.html" class="identifier">vector</a><double*,float*,long*,int*,short*,char*> pointers;
- typedef <a href="./reverse-transform.html" class="identifier">reverse_transform</a>< types,boost::add_pointer<<a href="./placeholders.html" class="identifier">_1</a>> >::type result;
- <a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( <a href="./equal.html" class="identifier">equal</a><result,pointers> ));
- </pre>
- </div>
- <div class="section" id="id748">
- <h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3>
- <p><a class="reference internal" href="./transformation-algorithms.html">Transformation Algorithms</a>, <a class="reference internal" href="./reversible-algorithm.html">Reversible Algorithm</a>, <a class="reference internal" href="./transform.html">transform</a>, <a class="reference internal" href="./reverse-copy.html">reverse_copy</a>, <a class="reference internal" href="./replace-if.html">replace_if</a></p>
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