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- <title>The MPL Reference Manual: equal</title>
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- <div class="section" id="equal">
- <h1><a class="toc-backref" href="./querying-algorithms.html#id1484">equal</a></h1>
- <div class="section" id="id607">
- <h3><a class="subsection-title" href="#synopsis" name="synopsis">Synopsis</a></h3>
- <pre class="literal-block">
- template<
- typename Seq1
- , typename Seq2
- , typename Pred = is_same<<a href="./placeholders.html" class="identifier">_1</a>,<a href="./placeholders.html" class="identifier">_2</a>>
- >
- struct <a href="./equal.html" class="identifier">equal</a>
- {
- typedef <em>unspecified</em> type;
- };
- </pre>
- </div>
- <div class="section" id="id608">
- <h3><a class="subsection-title" href="#description" name="description">Description</a></h3>
- <p>Returns a true-valued <a class="reference internal" href="./integral-constant.html">Integral Constant</a> if the two sequences <tt class="literal"><span class="pre">Seq1</span></tt>
- and <tt class="literal"><span class="pre">Seq2</span></tt> are identical when compared element-by-element.</p>
- </div>
- <div class="section" id="id609">
- <h3><a class="subsection-title" href="#header" name="header">Header</a></h3>
- <pre class="literal-block">
- #include <<a href="../../../../boost/mpl/equal.hpp" class="header">boost/mpl/equal.hpp</a>>
- </pre>
- </div>
- <div class="section" id="id610">
- <h3><a class="subsection-title" href="#parameters" name="parameters">Parameters</a></h3>
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- <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">Seq1</span></tt>, <tt class="literal"><span class="pre">Seq2</span></tt></td>
- <td><a class="reference internal" href="./forward-sequence.html">Forward Sequence</a></td>
- <td>Sequences to compare.</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>A comparison criterion.</td>
- </tr>
- </tbody>
- </table>
- </div>
- <div class="section" id="id611">
- <h3><a class="subsection-title" href="#expression-semantics" name="expression-semantics">Expression semantics</a></h3>
- <p>For any <a class="reference internal" href="./forward-sequence.html">Forward Sequence</a>s <tt class="literal"><span class="pre">s1</span></tt> and <tt class="literal"><span class="pre">s2</span></tt> and a binary <a class="reference internal" href="./lambda-expression.html">Lambda Expression</a> <tt class="literal"><span class="pre">pred</span></tt>:</p>
- <pre class="literal-block">
- typedef <a href="./equal.html" class="identifier">equal</a><s1,s2,pred>::type c;
- </pre>
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- <col class="field-name" />
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- <tr class="field"><th class="field-name">Return type:</th><td class="field-body"><p class="first"><a class="reference internal" href="./integral-constant.html">Integral Constant</a></p>
- </td>
- </tr>
- <tr class="field"><th class="field-name">Semantics:</th><td class="field-body"><p class="first"><tt class="literal"><span class="pre">c::value</span> <span class="pre">==</span> <span class="pre">true</span></tt> is and only if <tt class="literal"><span class="pre"><a href="./size.html" class="identifier">size</a><s1>::value</span> <span class="pre">==</span> <span class="pre"><a href="./size.html" class="identifier">size</a><s2>::value</span></tt>
- and for every iterator <tt class="literal"><span class="pre">i</span></tt> in [<tt class="literal"><span class="pre"><a href="./begin.html" class="identifier">begin</a><s1>::type</span></tt>, <tt class="literal"><span class="pre"><a href="./end.html" class="identifier">end</a><s1>::type</span></tt>) <tt class="literal"><span class="pre"><a href="./deref.html" class="identifier">deref</a><i>::type</span></tt> is identical to</p>
- <pre class="last literal-block">
- <a href="./advance.html" class="identifier">advance</a>< <a href="./begin.html" class="identifier">begin</a><s2>::type, <a href="./distance.html" class="identifier">distance</a>< <a href="./begin.html" class="identifier">begin</a><s1>::type,i >::type >::type
- </pre>
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- </div>
- <div class="section" id="id612">
- <h3><a class="subsection-title" href="#complexity" name="complexity">Complexity</a></h3>
- <p>Linear. At most <tt class="literal"><span class="pre"><a href="./size.html" class="identifier">size</a><s1>::value</span></tt> comparisons.</p>
- </div>
- <div class="section" id="id613">
- <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><char,int,unsigned,long,unsigned long> s1;
- typedef <a href="./list.html" class="identifier">list</a><char,int,unsigned,long,unsigned long> s2;
- <a href="./assert.html" class="identifier">BOOST_MPL_ASSERT</a>(( <a href="./equal.html" class="identifier">equal</a><s1,s2> ));
- </pre>
- </div>
- <div class="section" id="id614">
- <h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3>
- <p><a class="reference internal" href="./querying-algorithms.html">Querying Algorithms</a>, <a class="reference internal" href="./find.html">find</a>, <a class="reference internal" href="./find-if.html">find_if</a></p>
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