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- <div class="section" id="accumulate">
- <h1><a class="toc-backref" href="./iteration-algorithms.html#id1473">accumulate</a></h1>
- <div class="section" id="id527">
- <h3><a class="subsection-title" href="#synopsis" name="synopsis">Synopsis</a></h3>
- <pre class="literal-block">
- template<
- typename Sequence
- , typename State
- , typename ForwardOp
- >
- struct <a href="./accumulate.html" class="identifier">accumulate</a>
- {
- typedef <em>unspecified</em> type;
- };
- </pre>
- </div>
- <div class="section" id="id528">
- <h3><a class="subsection-title" href="#description" name="description">Description</a></h3>
- <p>Returns the result of the successive application of binary <tt class="literal"><span class="pre">ForwardOp</span></tt> to the
- result of the previous <tt class="literal"><span class="pre">ForwardOp</span></tt> invocation (<tt class="literal"><span class="pre">State</span></tt> if it's the first call)
- and every element of the sequence in the range [<tt class="literal"><span class="pre"><a href="./begin.html" class="identifier">begin</a><Sequence>::type</span></tt>, <tt class="literal"><span class="pre"><a href="./end.html" class="identifier">end</a><Sequence>::type</span></tt>) in order.
- [<em>Note:</em> <tt class="literal"><span class="pre"><a href="./accumulate.html" class="identifier">accumulate</a></span></tt> is a synonym for <a class="reference internal" href="./fold.html">fold</a> — <em>end note</em>]</p>
- </div>
- <div class="section" id="id529">
- <h3><a class="subsection-title" href="#header" name="header">Header</a></h3>
- <pre class="literal-block">
- #include <<a href="../../../../boost/mpl/accumulate.hpp" class="header">boost/mpl/accumulate.hpp</a>>
- </pre>
- </div>
- <div class="section" id="id530">
- <h3><a class="subsection-title" href="#parameters" name="parameters">Parameters</a></h3>
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- <col width="53%" />
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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">Sequence</span></tt></td>
- <td><a class="reference internal" href="./forward-sequence.html">Forward Sequence</a></td>
- <td>A sequence to iterate.</td>
- </tr>
- <tr><td><tt class="literal"><span class="pre">State</span></tt></td>
- <td>Any type</td>
- <td>The initial state for the first <tt class="literal"><span class="pre">ForwardOp</span></tt>
- application.</td>
- </tr>
- <tr><td><tt class="literal"><span class="pre">ForwardOp</span></tt></td>
- <td>Binary <a class="reference internal" href="./lambda-expression.html">Lambda Expression</a></td>
- <td>The operation to be executed on forward
- traversal.</td>
- </tr>
- </tbody>
- </table>
- </div>
- <div class="section" id="id531">
- <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> <tt class="literal"><span class="pre">s</span></tt>, binary <a class="reference internal" href="./lambda-expression.html">Lambda Expression</a> <tt class="literal"><span class="pre">op</span></tt>, and arbitrary type <tt class="literal"><span class="pre">state</span></tt>:</p>
- <pre class="literal-block">
- typedef <a href="./accumulate.html" class="identifier">accumulate</a><s,state,op>::type t;
- </pre>
- <table class="docutils field-list" frame="void" rules="none">
- <col class="field-name" />
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- <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">Equivalent to</p>
- <pre class="last literal-block">
- typedef <a href="./fold.html" class="identifier">fold</a><s,state,op>::type t;
- </pre>
- </td>
- </tr>
- </tbody>
- </table>
- </div>
- <div class="section" id="id532">
- <h3><a class="subsection-title" href="#complexity" name="complexity">Complexity</a></h3>
- <p>Linear. Exactly <tt class="literal"><span class="pre"><a href="./size.html" class="identifier">size</a><s>::value</span></tt> applications of <tt class="literal"><span class="pre">op</span></tt>.</p>
- </div>
- <div class="section" id="id533">
- <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><long,float,short,double,float,long,long double> types;
- typedef <a href="./accumulate.html" class="identifier">accumulate</a><
- types
- , <a href="./int.html" class="identifier">int_</a><0>
- , <a href="./if.html" class="identifier">if_</a>< is_float<<a href="./placeholders.html" class="identifier">_2</a>>,<a href="./next.html" class="identifier">next</a><<a href="./placeholders.html" class="identifier">_1</a>>,<a href="./placeholders.html" class="identifier">_1</a> >
- >::type number_of_floats;
- <a href="./assert-relation.html" class="identifier">BOOST_MPL_ASSERT_RELATION</a>( number_of_floats::value, ==, 4 );
- </pre>
- </div>
- <div class="section" id="id534">
- <h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3>
- <p><a class="reference internal" href="./algorithms.html">Algorithms</a>, <a class="reference internal" href="./fold.html">fold</a>, <a class="reference internal" href="./reverse-fold.html">reverse_fold</a>, <a class="reference internal" href="./iter-fold.html">iter_fold</a>, <a class="reference internal" href="./reverse-iter-fold.html">reverse_iter_fold</a>, <a class="reference internal" href="./copy.html">copy</a>, <a class="reference internal" href="./copy-if.html">copy_if</a></p>
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