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  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: &lt;<a class="link" href="../../boost_compute/reference.html#header.boost.compute.algorithm.transform_reduce_hpp" title="Header &lt;boost/compute/algorithm/transform_reduce.hpp&gt;">boost/compute/algorithm/transform_reduce.hpp</a>&gt;
  33
  34 </span>
  35 <span class="keyword">template</span><span class="special">&lt;</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">&gt;</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">&amp;</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">&lt;</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">&gt;</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">&amp;</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="idm46113329949728"></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>
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  67 <td align="right"><div class="copyright-footer">Copyright &#169; 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>)
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