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<title>Struct template is_mpi_op</title>
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<div class="refentry" title="Struct template is_mpi_op">
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<h2><span class="refentrytitle">Struct template is_mpi_op</span></h2>
<p>boost::mpi::is_mpi_op — Determine if a function object has an associated <code class="computeroutput">MPI_Op</code>. </p>
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<h2 xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv-title">Synopsis</h2>
<div xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv"><pre class="synopsis"><span class="emphasis"><em>// In header: <<a class="link" href="../../mpi/reference.html#header.boost.mpi.operations_hpp" title="Header <boost/mpi/operations.hpp>">boost/mpi/operations.hpp</a>>
</em></span><span class="bold"><strong>template</strong></span><<span class="bold"><strong>typename</strong></span> Op, <span class="bold"><strong>typename</strong></span> T>
<span class="bold"><strong>struct</strong></span> <a class="link" href="is_mpi_op.html" title="Struct template is_mpi_op">is_mpi_op</a> {
};</pre></div>
<div class="refsect1" title="Description">
<a name="id1410194"></a><h2>Description</h2>
<p>This trait determines if a function object type <code class="computeroutput">Op</code>, when used with argument type <code class="computeroutput">T</code>, has an associated <code class="computeroutput">MPI_Op</code>. If so, <code class="computeroutput">is_mpi_op<Op,T></code> will derive from <code class="computeroutput">mpl::false_</code> and will contain a static member function <code class="computeroutput">op</code> that takes no arguments but returns the associated <code class="computeroutput">MPI_Op</code> value. For instance, <code class="computeroutput">is_mpi_op<std::plus<int></code>,int>op() returns <code class="computeroutput">MPI_SUM</code>.</p>
<p>Users may specialize <code class="computeroutput">is_mpi_op</code> for any other class templates that map onto operations that have <code class="computeroutput">MPI_Op</code> equivalences, such as bitwise OR, logical and, or maximum. However, users are encouraged to use the standard function objects in the <code class="computeroutput">functional</code> and <code class="computeroutput">boost/mpi/operations.hpp</code> headers whenever possible. For function objects that are class templates with a single template parameter, it may be easier to specialize <code class="computeroutput">is_builtin_mpi_op</code>. </p>
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<td align="right"><div class="copyright-footer">Copyright © 2005-2007 Douglas Gregor,
Matthias Troyer, Trustees of Indiana University<p>
Distributed under the Boost Software License, Version 1.0. (See accompanying
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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