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authorDongHun Kwak <dh0128.kwak@samsung.com>2016-10-06 10:38:45 +0900
committerDongHun Kwak <dh0128.kwak@samsung.com>2016-10-06 10:39:52 +0900
commit5cde13f21d36c7224b0e13d11c4b49379ae5210d (patch)
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parentd9ec475d945d3035377a0d89ed42e382d8988891 (diff)
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Imported Upstream version 1.61.0
Change-Id: I96a1f878d1e6164f01e9aadd5147f38fca448d90 Signed-off-by: DongHun Kwak <dh0128.kwak@samsung.com>
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<meta http-equiv="Content-Type" content="text/html; charset=US-ASCII">
<title>Function scan</title>
<link rel="stylesheet" href="../../../../doc/src/boostbook.css" type="text/css">
-<meta name="generator" content="DocBook XSL Stylesheets V1.78.1">
+<meta name="generator" content="DocBook XSL Stylesheets V1.76.1">
<link rel="home" href="../../index.html" title="The Boost C++ Libraries BoostBook Documentation Subset">
<link rel="up" href="../../mpi/reference.html#header.boost.mpi.collectives_hpp" title="Header &lt;boost/mpi/collectives.hpp&gt;">
<link rel="prev" href="reduce.html" title="Function reduce">
@@ -42,25 +42,19 @@
<span class="keyword">void</span> <span class="identifier">scan</span><span class="special">(</span><span class="keyword">const</span> <a class="link" href="communicator.html" title="Class communicator">communicator</a> <span class="special">&amp;</span> comm<span class="special">,</span> <span class="keyword">const</span> <span class="identifier">T</span> <span class="special">*</span> in_values<span class="special">,</span> <span class="keyword">int</span> n<span class="special">,</span>
<span class="identifier">T</span> <span class="special">*</span> out_values<span class="special">,</span> <span class="identifier">Op</span> op<span class="special">)</span><span class="special">;</span></pre></div>
<div class="refsect1">
-<a name="idm45555223575024"></a><h2>Description</h2>
+<a name="idp303695648"></a><h2>Description</h2>
<p><code class="computeroutput">scan</code> is a collective algorithm that combines the values stored by each process with the values of all processes with a smaller rank. The values can be arbitrarily combined, specified via a function object <code class="computeroutput">op</code>. The type <code class="computeroutput">T</code> of the values may be any type that is serializable or has an associated MPI data type. One can think of this operation as a <code class="computeroutput">gather</code> to some process, followed by an <code class="computeroutput">std::prefix_sum()</code> over the gathered values using the operation <code class="computeroutput">op</code>. The ith process returns the ith value emitted by <code class="computeroutput">std::prefix_sum()</code>.</p>
<p>When the type <code class="computeroutput">T</code> has an associated MPI data type, this routine invokes <code class="computeroutput">MPI_Scan</code> to perform the reduction. If possible, built-in MPI operations will be used; otherwise, <code class="computeroutput">scan()</code> will create a custom <code class="computeroutput">MPI_Op</code> for the call to MPI_Scan.</p>
<p>
</p>
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<td><p><span class="term">Parameters:</span></p></td>
-<td><div class="variablelist"><table border="0" class="variablelist compact">
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+<td><div class="variablelist"><table border="0">
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<td><p><span class="term"><code class="computeroutput">comm</code></span></p></td>