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<h2><span class="refentrytitle">Struct template is_mpi_builtin_datatype</span></h2>
<p>boost::mpi::is_mpi_builtin_datatype — Type trait that determines if there exists a built-in MPI data type for a given C++ type. </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="comment">// In header: <<a class="link" href="../../mpi/reference.html#header.boost.mpi.datatype_hpp" title="Header <boost/mpi/datatype.hpp>">boost/mpi/datatype.hpp</a>>
</span><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> T<span class="special">></span>
<span class="keyword">struct</span> <a class="link" href="is_mpi_builtin_datatype.html" title="Struct template is_mpi_builtin_datatype">is_mpi_builtin_datatype</a> <span class="special">:</span> <span class="keyword">public</span> boost::mpl::or_< is_mpi_integer_datatype< T >, is_mpi_floating_point_datatype< T >, is_mpi_logical_datatype< T >, is_mpi_complex_datatype< T >, is_mpi_byte_datatype< T > >
<span class="special">{</span>
<span class="special">}</span><span class="special">;</span></pre></div>
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<a name="idm45555222386992"></a><h2>Description</h2>
<p>This type trait determines when there is a direct mapping from a C++ type to an MPI type. For instance, the C++ <code class="computeroutput">int</code> type maps directly to the MPI type <code class="computeroutput">MPI_INT</code>. When there is a direct mapping from the type <code class="computeroutput">T</code> to an MPI type, <code class="computeroutput"><a class="link" href="is_mpi_builtin_datatype.html" title="Struct template is_mpi_builtin_datatype">is_mpi_builtin_datatype</a></code> will derive from <code class="computeroutput">mpl::true_</code> and the MPI data type will be accessible via <code class="computeroutput">get_mpi_datatype</code>.</p>
<p>In general, users should not need to specialize this trait. However, if you have an additional C++ type that can map directly to only of MPI's built-in types, specialize either this trait or one of the traits corresponding to categories of MPI data types (<code class="computeroutput"><a class="link" href="is_mpi_integer_datatype.html" title="Struct template is_mpi_integer_datatype">is_mpi_integer_datatype</a></code>, <code class="computeroutput"><a class="link" href="is_mpi_f_idm45507104405744.html" title="Struct template is_mpi_floating_point_datatype">is_mpi_floating_point_datatype</a></code>, <code class="computeroutput"><a class="link" href="is_mpi_logical_datatype.html" title="Struct template is_mpi_logical_datatype">is_mpi_logical_datatype</a></code>, <code class="computeroutput"><a class="link" href="is_mpi_complex_datatype.html" title="Struct template is_mpi_complex_datatype">is_mpi_complex_datatype</a></code>, or <code class="computeroutput"><a class="link" href="is_mpi_builtin_datatype.html" title="Struct template is_mpi_builtin_datatype">is_mpi_builtin_datatype</a></code>). <code class="computeroutput"><a class="link" href="is_mpi_builtin_datatype.html" title="Struct template is_mpi_builtin_datatype">is_mpi_builtin_datatype</a></code> derives <code class="computeroutput">mpl::true_</code> if any of the traits corresponding to MPI data type categories derived <code class="computeroutput">mpl::true_</code>. </p>
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