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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&lt;
      typename Sequence
    , typename State
    , typename ForwardOp
    &gt;
struct <a href="./accumulate.html" class="identifier">accumulate</a>
{
    typedef <em>unspecified</em> type;
};
</pre>
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<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>&lt;Sequence&gt;::type</span></tt>, <tt class="literal"><span class="pre"><a href="./end.html" class="identifier">end</a>&lt;Sequence&gt;::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>
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<div class="section" id="id529">
<h3><a class="subsection-title" href="#header" name="header">Header</a></h3>
<pre class="literal-block">
#include &lt;<a href="../../../../boost/mpl/accumulate.hpp" class="header">boost/mpl/accumulate.hpp</a>&gt;
</pre>
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<h3><a class="subsection-title" href="#parameters" name="parameters">Parameters</a></h3>
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<col width="32%" />
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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>
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<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>&lt;s,state,op&gt;::type t;
</pre>
<table class="docutils field-list" frame="void" rules="none">
<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 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>&lt;s,state,op&gt;::type t;
</pre>
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<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>&lt;s&gt;::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>&lt;long,float,short,double,float,long,long double&gt; types;
typedef <a href="./accumulate.html" class="identifier">accumulate</a>&lt;
      types
    , <a href="./int.html" class="identifier">int_</a>&lt;0&gt;
    , <a href="./if.html" class="identifier">if_</a>&lt; is_float&lt;<a href="./placeholders.html" class="identifier">_2</a>&gt;,<a href="./next.html" class="identifier">next</a>&lt;<a href="./placeholders.html" class="identifier">_1</a>&gt;,<a href="./placeholders.html" class="identifier">_1</a> &gt;
    &gt;::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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