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14<div class="section" id="accumulate">
15<h1><a class="toc-backref" href="./iteration-algorithms.html#id401" name="accumulate">accumulate</a></h1>
16<div class="section" id="accumulate-synopsis">
17<h3><a class="subsection-title" href="#synopsis" name="synopsis">Synopsis</a></h3>
18<pre class="literal-block">
19template&lt;
20      typename Sequence
21    , typename State
22    , typename ForwardOp
23    &gt;
24struct <a href="./accumulate.html" class="identifier">accumulate</a>
25{
26    typedef <em>unspecified</em> type;
27};
28</pre>
29</div>
30<div class="section" id="accumulate-description">
31<h3><a class="subsection-title" href="#description" name="description">Description</a></h3>
32<p>Returns the result of the successive application of binary <tt class="literal"><span class="pre">ForwardOp</span></tt> to the
33result 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)
34and 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.
35[<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="refentry reference" href="./fold.html"><tt class="refentry literal"><span class="pre">fold</span></tt></a> — <em>end note</em>]</p>
36</div>
37<div class="section" id="accumulate-header">
38<h3><a class="subsection-title" href="#header" name="header">Header</a></h3>
39<pre class="literal-block">
40#include &lt;<a href="../../../../boost/mpl/accumulate.hpp" class="header">boost/mpl/accumulate.hpp</a>&gt;
41</pre>
42</div>
43<div class="section" id="accumulate-parameters">
44<h3><a class="subsection-title" href="#parameters" name="parameters">Parameters</a></h3>
45<table border="1" class="table">
46<colgroup>
47<col width="15%" />
48<col width="32%" />
49<col width="53%" />
50</colgroup>
51<thead valign="bottom">
52<tr><th>Parameter</th>
53<th>Requirement</th>
54<th>Description</th>
55</tr>
56</thead>
57<tbody valign="top">
58<tr><td><tt class="literal"><span class="pre">Sequence</span></tt></td>
59<td><a class="reference" href="./forward-sequence.html">Forward Sequence</a></td>
60<td>A sequence to iterate.</td>
61</tr>
62<tr><td><tt class="literal"><span class="pre">State</span></tt></td>
63<td>Any type</td>
64<td>The initial state for the first <tt class="literal"><span class="pre">ForwardOp</span></tt>
65application.</td>
66</tr>
67<tr><td><tt class="literal"><span class="pre">ForwardOp</span></tt></td>
68<td>Binary <a class="reference" href="./lambda-expression.html">Lambda Expression</a></td>
69<td>The operation to be executed on forward
70traversal.</td>
71</tr>
72</tbody>
73</table>
74</div>
75<div class="section" id="accumulate-expression-semantics">
76<h3><a class="subsection-title" href="#expression-semantics" name="expression-semantics">Expression semantics</a></h3>
77<p>For any <a class="reference" href="./forward-sequence.html">Forward Sequence</a> <tt class="literal"><span class="pre">s</span></tt>, binary <a class="reference" 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>
78<pre class="literal-block">
79typedef <a href="./accumulate.html" class="identifier">accumulate</a>&lt;s,state,op&gt;::type t;
80</pre>
81<table class="field-list" frame="void" rules="none">
82<col class="field-name" />
83<col class="field-body" />
84<tbody valign="top">
85<tr class="field"><th class="field-name">Return type:</th><td class="field-body">A type.</td>
86</tr>
87<tr class="field"><th class="field-name">Semantics:</th><td class="field-body"><p class="first">Equivalent to</p>
88<pre class="last literal-block">
89typedef <a href="./fold.html" class="identifier">fold</a>&lt;s,state,op&gt;::type t;
90</pre>
91</td>
92</tr>
93</tbody>
94</table>
95</div>
96<div class="section" id="accumulate-complexity">
97<h3><a class="subsection-title" href="#complexity" name="complexity">Complexity</a></h3>
98<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>
99</div>
100<div class="section" id="accumulate-example">
101<h3><a class="subsection-title" href="#example" name="example">Example</a></h3>
102<pre class="literal-block">
103typedef <a href="./vector.html" class="identifier">vector</a>&lt;long,float,short,double,float,long,long double&gt; types;
104typedef <a href="./accumulate.html" class="identifier">accumulate</a>&lt;
105      types
106    , <a href="./int.html" class="identifier">int_</a>&lt;0&gt;
107    , <a href="./if.html" class="identifier">if_</a>&lt; is_float&lt;_2&gt;,<a href="./next.html" class="identifier">next</a>&lt;_1&gt;,_1 &gt;
108    &gt;::type number_of_floats;
109
110<a href="./assert-relation.html" class="identifier">BOOST_MPL_ASSERT_RELATION</a>( number_of_floats::value, ==, 4 );
111</pre>
112</div>
113<div class="section" id="accumulate-see-also">
114<h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3>
115<p><a class="reference" href="./algorithms.html">Algorithms</a>, <a class="refentry reference" href="./fold.html"><tt class="refentry literal"><span class="pre">fold</span></tt></a>, <a class="refentry reference" href="./reverse-fold.html"><tt class="refentry literal"><span class="pre">reverse_fold</span></tt></a>, <a class="refentry reference" href="./iter-fold.html"><tt class="refentry literal"><span class="pre">iter_fold</span></tt></a>, <a class="refentry reference" href="./reverse-iter-fold.html"><tt class="refentry literal"><span class="pre">reverse_iter_fold</span></tt></a>, <a class="refentry reference" href="./copy.html"><tt class="refentry literal"><span class="pre">copy</span></tt></a>, <a class="refentry reference" href="./copy-if.html"><tt class="refentry literal"><span class="pre">copy_if</span></tt></a></p>
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