ceph/src/boost/libs/mpl/doc/refmanual/unique.html

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  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="./unique.html" class="navigation-link">unique</a></td>
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  14 <div class="section" id="unique">
  15 <h1><a class="toc-backref" href="./transformation-algorithms.html#id1493">unique</a></h1>
  16 <div class="section" id="id678">
  17 <h3><a class="subsection-title" href="#synopsis" name="synopsis">Synopsis</a></h3>
  18 <pre class="literal-block">
  19 template&lt;
  20       typename Seq
  21     , typename Pred
  22     , typename In = <em>unspecified</em>
  23     &gt;
  24 struct <a href="./unique.html" class="identifier">unique</a>
  25 {
  26     typedef <em>unspecified</em> type;
  27 };
  28 </pre>
  29 </div>
  30 <div class="section" id="id679">
  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
  33 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
  36 details in all cases — <em>end note</em>]</p>
  37 </div>
  38 <div class="section" id="id680">
  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="id681">
  45 <h3><a class="subsection-title" href="#model-of" name="model-of">Model of</a></h3>
  46 <p><a class="reference internal" href="./reversible-algorithm.html">Reversible Algorithm</a></p>
  47 </div>
  48 <div class="section" id="id682">
  49 <h3><a class="subsection-title" href="#parameters" name="parameters">Parameters</a></h3>
  50 <table border="1" class="docutils table">
  51 <colgroup>
  52 <col width="19%" />
  53 <col width="43%" />
  54 <col width="38%" />
  55 </colgroup>
  56 <thead valign="bottom">
  57 <tr><th class="head">Parameter</th>
  58 <th class="head">Requirement</th>
  59 <th class="head">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 internal" 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 internal" 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 internal" href="./inserter.html">Inserter</a></td>
  73 <td>An inserter.</td>
  74 </tr>
  75 </tbody>
  76 </table>
  77 </div>
  78 <div class="section" id="id683">
  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
  81 where they differ from, or are not defined in <a class="reference internal" href="./reversible-algorithm.html">Reversible Algorithm</a>.</p>
  82 <p>For any <a class="reference internal" href="./forward-sequence.html">Forward Sequence</a> <tt class="literal"><span class="pre">s</span></tt>, a binary <a class="reference internal" href="./lambda-expression.html">Lambda Expression</a> <tt class="literal"><span class="pre">pred</span></tt>,
  83 and an <a class="reference internal" href="./inserter.html">Inserter</a> <tt class="literal"><span class="pre">in</span></tt>:</p>
  84 <pre class="literal-block">
  85 typedef <a href="./unique.html" class="identifier">unique</a>&lt;s,pred,in&gt;::type r;
  86 </pre>
  87 <table class="docutils 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"><p class="first">A type.</p>
  92 </td>
  93 </tr>
  94 <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>
  95 <pre class="literal-block">
  96 typedef <a href="./copy.html" class="identifier">copy</a>&lt;s,in&gt;::type r;
  97 </pre>
  98 <p>otherwise equivalent to</p>
  99 <pre class="last literal-block">
 100 typedef <a href="./lambda.html" class="identifier">lambda</a>&lt;pred&gt;::type p;
 101 typedef <a href="./lambda.html" class="identifier">lambda</a>&lt;in::operation&gt;::type in_op;
 102 typedef <a href="./apply-wrap.html" class="identifier">apply_wrap</a><tt class="literal"><span class="pre">2</span></tt>&lt;
 103       in_op
 104     , in::state
 105     , <a href="./front.html" class="identifier">front</a>&lt;types&gt;::type
 106     &gt;::type in_state;
 107
 108 typedef <a href="./fold.html" class="identifier">fold</a>&lt;
 109       s
 110     , <a href="./pair.html" class="identifier">pair</a>&lt; in_state, <a href="./front.html" class="identifier">front</a>&lt;s&gt;::type &gt;
 111     , <a href="./eval-if.html" class="identifier">eval_if</a>&lt;
 112           <a href="./apply-wrap.html" class="identifier">apply_wrap</a><tt class="literal"><span class="pre">2</span></tt>&lt;p, second&lt;<a href="./placeholders.html" class="identifier">_1</a>&gt;, <a href="./placeholders.html" class="identifier">_2</a>&gt;
 113         , <a href="./identity.html" class="identifier">identity</a>&lt; first&lt;<a href="./placeholders.html" class="identifier">_1</a>&gt; &gt;
 114         , <a href="./apply-wrap.html" class="identifier">apply_wrap</a><tt class="literal"><span class="pre">2</span></tt>&lt;in_op, first&lt;<a href="./placeholders.html" class="identifier">_1</a>&gt;, <a href="./placeholders.html" class="identifier">_2</a>&gt;
 115         &gt;
 116     &gt;::type::first r;
 117 </pre>
 118 </td>
 119 </tr>
 120 </tbody>
 121 </table>
 122 </div>
 123 <div class="section" id="id684">
 124 <h3><a class="subsection-title" href="#complexity" name="complexity">Complexity</a></h3>
 125 <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
 126 most <tt class="literal"><span class="pre"><a href="./size.html" class="identifier">size</a>&lt;s&gt;::value</span></tt> insertions.</p>
 127 </div>
 128 <div class="section" id="id685">
 129 <h3><a class="subsection-title" href="#example" name="example">Example</a></h3>
 130 <pre class="literal-block">
 131 typedef <a href="./vector.html" class="identifier">vector</a>&lt;int,float,float,char,int,int,int,double&gt; types;
 132 typedef <a href="./vector.html" class="identifier">vector</a>&lt;int,float,char,int,double&gt; expected;
 133 typedef <a href="./unique.html" class="identifier">unique</a>&lt; types, is_same&lt;<a href="./placeholders.html" class="identifier">_1</a>,<a href="./placeholders.html" class="identifier">_2</a>&gt; &gt;::type result;
 134
 135 <a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( <a href="./equal.html" class="identifier">equal</a>&lt; result,expected > ));
 136 </pre>
 137 </div>
 138 <div class="section" id="id686">
 139 <h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3>
 140 <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="./reverse-unique.html">reverse_unique</a>, <a class="reference internal" href="./remove.html">remove</a>, <a class="reference internal" href="./copy-if.html">copy_if</a>, <a class="reference internal" href="./replace-if.html">replace_if</a></p>
 141 <!-- Algorithms/Transformation Algorithms//partition |85 -->
 142 </div>
 143 </div>
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