1<html> 2<head> 3<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> 4<title>Function transform_reduce</title> 5<link rel="stylesheet" href="../../../../../../doc/src/boostbook.css" type="text/css"> 6<meta name="generator" content="DocBook XSL Stylesheets V1.79.1"> 7<link rel="home" href="../../index.html" title="Chapter 1. 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20</tr></table> 21<hr> 22<div class="spirit-nav"> 23<a accesskey="p" href="transform_if.html"><img src="../../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../../boost_compute/reference.html#header.boost.compute.algorithm.transform_reduce_hpp"><img src="../../../../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../../index.html"><img src="../../../../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="unique.html"><img src="../../../../../../doc/src/images/next.png" alt="Next"></a> 24</div> 25<div class="refentry"> 26<a name="boost.compute.transform_reduce"></a><div class="titlepage"></div> 27<div class="refnamediv"> 28<h2><span class="refentrytitle">Function transform_reduce</span></h2> 29<p>boost::compute::transform_reduce</p> 30</div> 31<h2 xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv-title">Synopsis</h2> 32<div xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv"><pre class="synopsis"><span class="comment">// In header: <<a class="link" href="../../boost_compute/reference.html#header.boost.compute.algorithm.transform_reduce_hpp" title="Header <boost/compute/algorithm/transform_reduce.hpp>">boost/compute/algorithm/transform_reduce.hpp</a>> 33 34</span> 35<span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> InputIterator<span class="special">,</span> <span class="keyword">typename</span> OutputIterator<span class="special">,</span> 36 <span class="keyword">typename</span> UnaryTransformFunction<span class="special">,</span> <span class="keyword">typename</span> BinaryReduceFunction<span class="special">></span> 37 <span class="keyword">void</span> <span class="identifier">transform_reduce</span><span class="special">(</span><span class="identifier">InputIterator</span> first<span class="special">,</span> <span class="identifier">InputIterator</span> last<span class="special">,</span> 38 <span class="identifier">OutputIterator</span> result<span class="special">,</span> 39 <span class="identifier">UnaryTransformFunction</span> transform_function<span class="special">,</span> 40 <span class="identifier">BinaryReduceFunction</span> reduce_function<span class="special">,</span> 41 <span class="identifier">command_queue</span> <span class="special">&</span> queue <span class="special">=</span> <span class="identifier">system</span><span class="special">::</span><span class="identifier">default_queue</span><span class="special">(</span><span class="special">)</span><span class="special">)</span><span class="special">;</span> 42<span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> InputIterator1<span class="special">,</span> <span class="keyword">typename</span> InputIterator2<span class="special">,</span> 43 <span class="keyword">typename</span> OutputIterator<span class="special">,</span> <span class="keyword">typename</span> BinaryTransformFunction<span class="special">,</span> 44 <span class="keyword">typename</span> BinaryReduceFunction<span class="special">></span> 45 <span class="keyword">void</span> <span class="identifier">transform_reduce</span><span class="special">(</span><span class="identifier">InputIterator1</span> first1<span class="special">,</span> <span class="identifier">InputIterator1</span> last1<span class="special">,</span> 46 <span class="identifier">InputIterator2</span> first2<span class="special">,</span> <span class="identifier">OutputIterator</span> result<span class="special">,</span> 47 <span class="identifier">BinaryTransformFunction</span> transform_function<span class="special">,</span> 48 <span class="identifier">BinaryReduceFunction</span> reduce_function<span class="special">,</span> 49 <span class="identifier">command_queue</span> <span class="special">&</span> queue <span class="special">=</span> <span class="identifier">system</span><span class="special">::</span><span class="identifier">default_queue</span><span class="special">(</span><span class="special">)</span><span class="special">)</span><span class="special">;</span></pre></div> 50<div class="refsect1"> 51<a name="idm45849518074576"></a><h2>Description</h2> 52<p>Transforms each value in the range [<code class="computeroutput">first</code>, <code class="computeroutput">last</code>) with the unary <code class="computeroutput">transform_function</code> and then reduces each transformed value with <code class="computeroutput">reduce_function</code>.</p> 53<p>For example, to calculate the sum of the absolute values of a vector of integers:</p> 54<pre class="programlisting"></pre> 55<p> Space complexity on GPUs: \Omega(n)<br> 56 Space complexity on CPUs: \Omega(1)</p> 57<p><span class="bold"><strong>See Also:</strong></span></p> 58<p>reduce(), inner_product() </p> 59<p> 60</p> 61<p> 62</p> 63</div> 64</div> 65<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> 66<td align="left"></td> 67<td align="right"><div class="copyright-footer">Copyright © 2013, 2014 Kyle Lutz<p> 68 Distributed under the Boost Software License, Version 1.0. (See accompanying 69 file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>) 70 </p> 71</div></td> 72</tr></table> 73<hr> 74<div class="spirit-nav"> 75<a accesskey="p" href="transform_if.html"><img src="../../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../../boost_compute/reference.html#header.boost.compute.algorithm.transform_reduce_hpp"><img src="../../../../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../../index.html"><img src="../../../../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="unique.html"><img src="../../../../../../doc/src/images/next.png" alt="Next"></a> 76</div> 77</body> 78</html> 79
