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- <title>The MPL Reference Manual: unique</title>
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- <div class="section" id="unique">
- <h1><a class="toc-backref" href="./transformation-algorithms.html#id1493">unique</a></h1>
- <div class="section" id="id678">
- <h3><a class="subsection-title" href="#synopsis" name="synopsis">Synopsis</a></h3>
- <pre class="literal-block">
- template<
- typename Seq
- , typename Pred
- , typename In = <em>unspecified</em>
- >
- struct <a href="./unique.html" class="identifier">unique</a>
- {
- typedef <em>unspecified</em> type;
- };
- </pre>
- </div>
- <div class="section" id="id679">
- <h3><a class="subsection-title" href="#description" name="description">Description</a></h3>
- <p>Returns a sequence of the initial elements of every subrange of the
- original sequence <tt class="literal"><span class="pre">Seq</span></tt> whose elements are all the same.</p>
- <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="id680">
- <h3><a class="subsection-title" href="#header" name="header">Header</a></h3>
- <pre class="literal-block">
- #include <<a href="../../../../boost/mpl/unique.hpp" class="header">boost/mpl/unique.hpp</a>>
- </pre>
- </div>
- <div class="section" id="id681">
- <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="id682">
- <h3><a class="subsection-title" href="#parameters" name="parameters">Parameters</a></h3>
- <table border="1" class="docutils table">
- <colgroup>
- <col width="19%" />
- <col width="43%" />
- <col width="38%" />
- </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></td>
- <td><a class="reference internal" href="./forward-sequence.html">Forward Sequence</a></td>
- <td>An original sequence.</td>
- </tr>
- <tr><td><tt class="literal"><span class="pre">Pred</span></tt></td>
- <td>Binary <a class="reference internal" href="./lambda-expression.html">Lambda Expression</a></td>
- <td>An equivalence relation.</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="id683">
- <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> <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>,
- 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="./unique.html" class="identifier">unique</a><s,pred,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">Semantics:</th><td class="field-body"><p class="first">If <tt class="literal"><span class="pre"><a href="./size.html" class="identifier">size</a><s>::value</span> <span class="pre"><=</span> <span class="pre">1</span></tt>, then equivalent to</p>
- <pre class="literal-block">
- typedef <a href="./copy.html" class="identifier">copy</a><s,in>::type r;
- </pre>
- <p>otherwise equivalent to</p>
- <pre class="last literal-block">
- typedef <a href="./lambda.html" class="identifier">lambda</a><pred>::type p;
- typedef <a href="./lambda.html" class="identifier">lambda</a><in::operation>::type in_op;
- typedef <a href="./apply-wrap.html" class="identifier">apply_wrap</a><tt class="literal"><span class="pre">2</span></tt><
- in_op
- , in::state
- , <a href="./front.html" class="identifier">front</a><types>::type
- >::type in_state;
- typedef <a href="./fold.html" class="identifier">fold</a><
- s
- , <a href="./pair.html" class="identifier">pair</a>< in_state, <a href="./front.html" class="identifier">front</a><s>::type >
- , <a href="./eval-if.html" class="identifier">eval_if</a><
- <a href="./apply-wrap.html" class="identifier">apply_wrap</a><tt class="literal"><span class="pre">2</span></tt><p, second<<a href="./placeholders.html" class="identifier">_1</a>>, <a href="./placeholders.html" class="identifier">_2</a>>
- , <a href="./identity.html" class="identifier">identity</a>< first<<a href="./placeholders.html" class="identifier">_1</a>> >
- , <a href="./apply-wrap.html" class="identifier">apply_wrap</a><tt class="literal"><span class="pre">2</span></tt><in_op, first<<a href="./placeholders.html" class="identifier">_1</a>>, <a href="./placeholders.html" class="identifier">_2</a>>
- >
- >::type::first r;
- </pre>
- </td>
- </tr>
- </tbody>
- </table>
- </div>
- <div class="section" id="id684">
- <h3><a class="subsection-title" href="#complexity" name="complexity">Complexity</a></h3>
- <p>Linear. Performs exactly <tt class="literal"><span class="pre"><a href="./size.html" class="identifier">size</a><s>::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
- most <tt class="literal"><span class="pre"><a href="./size.html" class="identifier">size</a><s>::value</span></tt> insertions.</p>
- </div>
- <div class="section" id="id685">
- <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><int,float,float,char,int,int,int,double> types;
- typedef <a href="./vector.html" class="identifier">vector</a><int,float,char,int,double> expected;
- typedef <a href="./unique.html" class="identifier">unique</a>< types, is_same<<a href="./placeholders.html" class="identifier">_1</a>,<a href="./placeholders.html" class="identifier">_2</a>> >::type result;
- <a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( <a href="./equal.html" class="identifier">equal</a>< result,expected > ));
- </pre>
- </div>
- <div class="section" id="id686">
- <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="./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>
- <!-- Algorithms/Transformation Algorithms//partition |85 -->
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