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11<table class="header"><tr class="header"><td class="header-group navigation-bar"><span class="navigation-group"><a href="./reverse-remove-if.html" class="navigation-link">Prev</a>&nbsp;<a href="./reverse-partition.html" class="navigation-link">Next</a></span><span class="navigation-group-separator">&nbsp;|&nbsp;</span><span class="navigation-group"><a href="./reverse-remove-if.html" class="navigation-link">Back</a>&nbsp;<a href="./reverse-partition.html" class="navigation-link">Along</a></span><span class="navigation-group-separator">&nbsp;|&nbsp;</span><span class="navigation-group"><a href="./transformation-algorithms.html" class="navigation-link">Up</a>&nbsp;<a href="../refmanual.html" class="navigation-link">Home</a></span><span class="navigation-group-separator">&nbsp;|&nbsp;</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="./transformation-algorithms.html" class="navigation-link">Transformation Algorithms</a> / <a href="./reverse-unique.html" class="navigation-link">reverse_unique</a></td>
13</tr></table><div class="header-separator"></div>
14<div class="section" id="reverse-unique">
15<h1><a class="toc-backref" href="./transformation-algorithms.html#id433" name="reverse-unique">reverse_unique</a></h1>
16<div class="section" id="id170">
17<h3><a class="subsection-title" href="#synopsis" name="synopsis">Synopsis</a></h3>
18<pre class="literal-block">
19template&lt;
20      typename Seq
21    , typename Pred
22    , typename In = <em>unspecified</em>
23    &gt;
24struct <a href="./reverse-unique.html" class="identifier">reverse_unique</a>
25{
26    typedef <em>unspecified</em> type;
27};
28</pre>
29</div>
30<div class="section" id="id171">
31<h3><a class="subsection-title" href="#description" name="description">Description</a></h3>
32<p>Returns a sequence of the initial elements of every subrange of the
33reversed original sequence <tt class="literal"><span class="pre">Seq</span></tt> whose elements are all the same.</p>
34<p>[<em>Note:</em> This wording applies to a no-inserter version(s) of the algorithm. See the
35<cite>Expression semantics</cite> subsection for a precise specification of the algorithm's
36details in all cases — <em>end note</em>]</p>
37</div>
38<div class="section" id="id172">
39<h3><a class="subsection-title" href="#header" name="header">Header</a></h3>
40<pre class="literal-block">
41#include &lt;<a href="../../../../boost/mpl/unique.hpp" class="header">boost/mpl/unique.hpp</a>&gt;
42</pre>
43</div>
44<div class="section" id="id173">
45<h3><a class="subsection-title" href="#model-of" name="model-of">Model of</a></h3>
46<p><a class="reference" href="./reversible-algorithm.html">Reversible Algorithm</a></p>
47</div>
48<div class="section" id="id174">
49<h3><a class="subsection-title" href="#parameters" name="parameters">Parameters</a></h3>
50<table border="1" class="table">
51<colgroup>
52<col width="19%" />
53<col width="43%" />
54<col width="38%" />
55</colgroup>
56<thead valign="bottom">
57<tr><th>Parameter</th>
58<th>Requirement</th>
59<th>Description</th>
60</tr>
61</thead>
62<tbody valign="top">
63<tr><td><tt class="literal"><span class="pre">Sequence</span></tt></td>
64<td><a class="reference" href="./forward-sequence.html">Forward Sequence</a></td>
65<td>An original sequence.</td>
66</tr>
67<tr><td><tt class="literal"><span class="pre">Pred</span></tt></td>
68<td>Binary <a class="reference" href="./lambda-expression.html">Lambda Expression</a></td>
69<td>An equivalence relation.</td>
70</tr>
71<tr><td><tt class="literal"><span class="pre">In</span></tt></td>
72<td><a class="reference" href="./inserter.html">Inserter</a></td>
73<td>An inserter.</td>
74</tr>
75</tbody>
76</table>
77</div>
78<div class="section" id="id175">
79<h3><a class="subsection-title" href="#expression-semantics" name="expression-semantics">Expression semantics</a></h3>
80<p>The semantics of an expression are defined only
81where they differ from, or are not defined in <a class="reference" href="./reversible-algorithm.html">Reversible Algorithm</a>.</p>
82<p>For any <a class="reference" href="./forward-sequence.html">Forward Sequence</a> <tt class="literal"><span class="pre">s</span></tt>, a binary <a class="reference" href="./lambda-expression.html">Lambda Expression</a> <tt class="literal"><span class="pre">pred</span></tt>,
83and an <a class="reference" href="./inserter.html">Inserter</a> <tt class="literal"><span class="pre">in</span></tt>:</p>
84<pre class="literal-block">
85typedef <a href="./reverse-unique.html" class="identifier">reverse_unique</a>&lt;s,pred,in&gt;::type r;
86</pre>
87<table class="field-list" frame="void" rules="none">
88<col class="field-name" />
89<col class="field-body" />
90<tbody valign="top">
91<tr class="field"><th class="field-name">Return type:</th><td class="field-body">A type.</td>
92</tr>
93<tr class="field"><th class="field-name">Semantics:</th><td class="field-body"><p class="first">If <tt class="literal"><span class="pre"><a href="./size.html" class="identifier">size</a>&lt;s&gt;::value</span> <span class="pre">&lt;=</span> <span class="pre">1</span></tt>, then equivalent to</p>
94<pre class="literal-block">
95typedef <a href="./reverse-copy.html" class="identifier">reverse_copy</a>&lt;s,in&gt;::type r;
96</pre>
97<p>otherwise equivalent to</p>
98<pre class="last literal-block">
99typedef <a href="./lambda.html" class="identifier">lambda</a>&lt;pred&gt;::type p;
100typedef <a href="./lambda.html" class="identifier">lambda</a>&lt;in::operation&gt;::type in_op;
101typedef <a href="./apply-wrap.html" class="identifier">apply_wrap</a><tt class="literal"><span class="pre">2</span></tt>&lt;
102      in_op
103    , in::state
104    , <a href="./front.html" class="identifier">front</a>&lt;types&gt;::type
105    &gt;::type in_state;
106
107typedef <a href="./reverse-fold.html" class="identifier">reverse_fold</a>&lt;
108      s
109    , <a href="./pair.html" class="identifier">pair</a>&lt; in_state, <a href="./front.html" class="identifier">front</a>&lt;s&gt;::type &gt;
110    , <a href="./eval-if.html" class="identifier">eval_if</a>&lt; 
111          <a href="./apply-wrap.html" class="identifier">apply_wrap</a><tt class="literal"><span class="pre">2</span></tt>&lt;p, second&lt;_1&gt;, _2&gt;
112        , <a href="./identity.html" class="identifier">identity</a>&lt; first&lt;_1&gt; &gt;
113        , <a href="./apply-wrap.html" class="identifier">apply_wrap</a><tt class="literal"><span class="pre">2</span></tt>&lt;in_op, first&lt;_1&gt;, _2&gt;
114        &gt;
115    &gt;::type::first r;
116</pre>
117</td>
118</tr>
119</tbody>
120</table>
121</div>
122<div class="section" id="id176">
123<h3><a class="subsection-title" href="#complexity" name="complexity">Complexity</a></h3>
124<p>Linear. Performs exactly <tt class="literal"><span class="pre"><a href="./size.html" class="identifier">size</a>&lt;s&gt;::value</span> <span class="pre">-</span> <span class="pre">1</span></tt> applications of <tt class="literal"><span class="pre">pred</span></tt>, and at
125most <tt class="literal"><span class="pre"><a href="./size.html" class="identifier">size</a>&lt;s&gt;::value</span></tt> insertions.</p>
126</div>
127<div class="section" id="id177">
128<h3><a class="subsection-title" href="#example" name="example">Example</a></h3>
129<pre class="literal-block">
130typedef <a href="./vector.html" class="identifier">vector</a>&lt;int,float,float,char,int,int,int,double&gt; types;
131typedef <a href="./vector.html" class="identifier">vector</a>&lt;double,int,char,float,int&gt; expected;
132typedef <a href="./reverse-unique.html" class="identifier">reverse_unique</a>&lt; types, is_same&lt;_1,_2&gt; &gt;::type result;
133
134<a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( <a href="./equal.html" class="identifier">equal</a>&lt; result,expected > ));
135</pre>
136</div>
137<div class="section" id="id178">
138<h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3>
139<p><a class="reference" href="./transformation-algorithms.html">Transformation Algorithms</a>, <a class="reference" href="./reversible-algorithm.html">Reversible Algorithm</a>, <a class="refentry reference" href="./unique.html"><tt class="refentry literal"><span class="pre">unique</span></tt></a>, <a class="refentry reference" href="./reverse-remove.html"><tt class="refentry literal"><span class="pre">reverse_remove</span></tt></a>,
140<a class="refentry reference" href="./reverse-copy-if.html"><tt class="refentry literal"><span class="pre">reverse_copy_if</span></tt></a>, <a class="refentry reference" href="./replace-if.html"><tt class="refentry literal"><span class="pre">replace_if</span></tt></a></p>
141<!-- modtime: November 10, 2004 04:32:16 +0000 -->
142<!-- Algorithms/Transformation Algorithms//reverse_partition |185 -->
143</div>
144</div>
145
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