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| <title>The MPL Reference Manual: unique</title> |
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| <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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| <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> |
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| <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> |
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