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10<title>The MPL Reference Manual: unique</title>
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14<table class="header"><tr class="header"><td class="header-group navigation-bar"><span class="navigation-group"><a href="./remove-if.html" class="navigation-link">Prev</a>&nbsp;<a href="./partition.html" class="navigation-link">Next</a></span><span class="navigation-group-separator">&nbsp;|&nbsp;</span><span class="navigation-group"><a href="./remove-if.html" class="navigation-link">Back</a>&nbsp;<a href="./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>
15<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="./unique.html" class="navigation-link">unique</a></td>
16</tr></table><div class="header-separator"></div>
17<div class="section" id="unique">
18<h1><a class="toc-backref" href="./transformation-algorithms.html#id421" name="unique">unique</a></h1>
19<div class="section" id="unique-synopsis">
20<h3><a class="subsection-title" href="#synopsis" name="synopsis">Synopsis</a></h3>
21<pre class="literal-block">
22template&lt;
23      typename Seq
24    , typename Pred
25    , typename In = <em>unspecified</em>
26    &gt;
27struct <a href="./unique.html" class="identifier">unique</a>
28{
29    typedef <em>unspecified</em> type;
30};
31</pre>
32</div>
33<div class="section" id="unique-description">
34<h3><a class="subsection-title" href="#description" name="description">Description</a></h3>
35<p>Returns a sequence of the initial elements of every subrange of the
36original sequence <tt class="literal"><span class="pre">Seq</span></tt> whose elements are all the same.</p>
37<p>[<em>Note:</em> This wording applies to a no-inserter version(s) of the algorithm. See the
38<cite>Expression semantics</cite> subsection for a precise specification of the algorithm's
39details in all cases — <em>end note</em>]</p>
40</div>
41<div class="section" id="unique-header">
42<h3><a class="subsection-title" href="#header" name="header">Header</a></h3>
43<pre class="literal-block">
44#include &lt;<a href="../../../../boost/mpl/unique.hpp" class="header">boost/mpl/unique.hpp</a>&gt;
45</pre>
46</div>
47<div class="section" id="unique-model-of">
48<h3><a class="subsection-title" href="#model-of" name="model-of">Model of</a></h3>
49<p><a class="reference" href="./reversible-algorithm.html">Reversible Algorithm</a></p>
50</div>
51<div class="section" id="unique-parameters">
52<h3><a class="subsection-title" href="#parameters" name="parameters">Parameters</a></h3>
53<table border="1" class="table">
54<colgroup>
55<col width="19%" />
56<col width="43%" />
57<col width="38%" />
58</colgroup>
59<thead valign="bottom">
60<tr><th>Parameter</th>
61<th>Requirement</th>
62<th>Description</th>
63</tr>
64</thead>
65<tbody valign="top">
66<tr><td><tt class="literal"><span class="pre">Sequence</span></tt></td>
67<td><a class="reference" href="./forward-sequence.html">Forward Sequence</a></td>
68<td>An original sequence.</td>
69</tr>
70<tr><td><tt class="literal"><span class="pre">Pred</span></tt></td>
71<td>Binary <a class="reference" href="./lambda-expression.html">Lambda Expression</a></td>
72<td>An equivalence relation.</td>
73</tr>
74<tr><td><tt class="literal"><span class="pre">In</span></tt></td>
75<td><a class="reference" href="./inserter.html">Inserter</a></td>
76<td>An inserter.</td>
77</tr>
78</tbody>
79</table>
80</div>
81<div class="section" id="unique-expression-semantics">
82<h3><a class="subsection-title" href="#expression-semantics" name="expression-semantics">Expression semantics</a></h3>
83<p>The semantics of an expression are defined only
84where they differ from, or are not defined in <a class="reference" href="./reversible-algorithm.html">Reversible Algorithm</a>.</p>
85<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>,
86and an <a class="reference" href="./inserter.html">Inserter</a> <tt class="literal"><span class="pre">in</span></tt>:</p>
87<pre class="literal-block">
88typedef <a href="./unique.html" class="identifier">unique</a>&lt;s,pred,in&gt;::type r;
89</pre>
90<table class="field-list" frame="void" rules="none">
91<col class="field-name" />
92<col class="field-body" />
93<tbody valign="top">
94<tr class="field"><th class="field-name">Return type:</th><td class="field-body">A type.</td>
95</tr>
96<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>
97<pre class="literal-block">
98typedef <a href="./copy.html" class="identifier">copy</a>&lt;s,in&gt;::type r;
99</pre>
100<p>otherwise equivalent to</p>
101<pre class="last literal-block">
102typedef <a href="./lambda.html" class="identifier">lambda</a>&lt;pred&gt;::type p;
103typedef <a href="./lambda.html" class="identifier">lambda</a>&lt;in::operation&gt;::type in_op;
104typedef <a href="./apply-wrap.html" class="identifier">apply_wrap</a><tt class="literal"><span class="pre">2</span></tt>&lt;
105      in_op
106    , in::state
107    , <a href="./front.html" class="identifier">front</a>&lt;types&gt;::type
108    &gt;::type in_state;
109
110typedef <a href="./fold.html" class="identifier">fold</a>&lt;
111      s
112    , <a href="./pair.html" class="identifier">pair</a>&lt; in_state, <a href="./front.html" class="identifier">front</a>&lt;s&gt;::type &gt;
113    , <a href="./eval-if.html" class="identifier">eval_if</a>&lt; 
114          <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;
115        , <a href="./identity.html" class="identifier">identity</a>&lt; first&lt;_1&gt; &gt;
116        , <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;
117        &gt;
118    &gt;::type::first r;
119</pre>
120</td>
121</tr>
122</tbody>
123</table>
124</div>
125<div class="section" id="unique-complexity">
126<h3><a class="subsection-title" href="#complexity" name="complexity">Complexity</a></h3>
127<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
128most <tt class="literal"><span class="pre"><a href="./size.html" class="identifier">size</a>&lt;s&gt;::value</span></tt> insertions.</p>
129</div>
130<div class="section" id="unique-example">
131<h3><a class="subsection-title" href="#example" name="example">Example</a></h3>
132<pre class="literal-block">
133typedef <a href="./vector.html" class="identifier">vector</a>&lt;int,float,float,char,int,int,int,double&gt; types;
134typedef <a href="./vector.html" class="identifier">vector</a>&lt;int,float,char,int,double&gt; expected;
135typedef <a href="./unique.html" class="identifier">unique</a>&lt; types, is_same&lt;_1,_2&gt; &gt;::type result;
136
137<a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( <a href="./equal.html" class="identifier">equal</a>&lt; result,expected > ));
138</pre>
139</div>
140<div class="section" id="unique-see-also">
141<h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3>
142<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="./reverse-unique.html"><tt class="refentry literal"><span class="pre">reverse_unique</span></tt></a>, <a class="refentry reference" href="./remove.html"><tt class="refentry literal"><span class="pre">remove</span></tt></a>, <a class="refentry reference" href="./copy-if.html"><tt class="refentry literal"><span class="pre">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>
143<!-- modtime: November 10, 2004 04:31:00 +0000 -->
144<!-- Algorithms/Transformation Algorithms//partition |85 -->
145</div>
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147
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