<?xml version="1.0" encoding="utf-8" ?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <meta name="generator" content="Docutils 0.6: http://docutils.sourceforge.net/" /> <title>The MPL Reference Manual: accumulate</title> <link rel="stylesheet" href="../style.css" type="text/css" /> </head> <body class="docframe refmanual"> <table class="header"><tr class="header"><td class="header-group navigation-bar"><span class="navigation-group"><a href="./reverse-iter-fold.html" class="navigation-link">Prev</a> <a href="./querying-algorithms.html" class="navigation-link">Next</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./reverse-iter-fold.html" class="navigation-link">Back</a> Along</span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./iteration-algorithms.html" class="navigation-link">Up</a> <a href="../refmanual.html" class="navigation-link">Home</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./refmanual_toc.html" class="navigation-link">Full TOC</a></span></td> <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="./iteration-algorithms.html" class="navigation-link">Iteration Algorithms</a> / <a href="./accumulate.html" class="navigation-link">accumulate</a></td> </tr></table><div class="header-separator"></div> <div class="section" id="accumulate"> <h1><a class="toc-backref" href="./iteration-algorithms.html#id1456">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> <table border="1" class="docutils table"> <colgroup> <col width="15%" /> <col width="32%" /> <col width="53%" /> </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>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" /> <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">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> </div> </div> <div class="footer-separator"></div> <table class="footer"><tr class="footer"><td class="header-group navigation-bar"><span class="navigation-group"><a href="./reverse-iter-fold.html" class="navigation-link">Prev</a> <a href="./querying-algorithms.html" class="navigation-link">Next</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./reverse-iter-fold.html" class="navigation-link">Back</a> Along</span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./iteration-algorithms.html" class="navigation-link">Up</a> <a href="../refmanual.html" class="navigation-link">Home</a></span><span class="navigation-group-separator"> | </span><span class="navigation-group"><a href="./refmanual_toc.html" class="navigation-link">Full TOC</a></span></td> <td><div class="copyright-footer"><div class="copyright">Copyright © 2001-2009 Aleksey Gurtovoy and David Abrahams</div> Distributed under the Boost Software License, Version 1.0. 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