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<title>Struct graph_traits<mpi::graph_communicator></title>
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<div class="refentry" title="Struct graph_traits<mpi::graph_communicator>">
<a name="boost.graph_traits_mpi_graph__id893185"></a><div class="titlepage"></div>
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<h2><span class="refentrytitle">Struct graph_traits<mpi::graph_communicator></span></h2>
<p>boost::graph_traits<mpi::graph_communicator> — Traits structure that allows a communicator with graph topology to be view as a graph by the Boost Graph Library. </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.graph_communicator_hpp" title="Header <boost/mpi/graph_communicator.hpp>">boost/mpi/graph_communicator.hpp</a>>
</em></span>
<span class="bold"><strong>struct</strong></span> <a class="link" href="graph_traits_mpi_graph__id893185.html" title="Struct graph_traits<mpi::graph_communicator>">graph_traits</a><mpi::graph_communicator> {
<span class="emphasis"><em>// types</em></span>
<span class="bold"><strong>typedef</strong></span> <span class="bold"><strong>int</strong></span> <a name="boost.graph_traits_mpi_graph__id893185.vertex_descriptor"></a>vertex_descriptor;
<span class="bold"><strong>typedef</strong></span> std::pair< <span class="bold"><strong>int</strong></span>, <span class="bold"><strong>int</strong></span> > <a name="boost.graph_traits_mpi_graph__id893185.edge_descriptor"></a>edge_descriptor;
<span class="bold"><strong>typedef</strong></span> directed_tag <a name="boost.graph_traits_mpi_graph__id893185.directed_category"></a>directed_category;
<span class="bold"><strong>typedef</strong></span> disallow_parallel_edge_tag <a name="boost.graph_traits_mpi_graph__id893185.edge_parallel_category"></a>edge_parallel_category;
<span class="bold"><strong>typedef</strong></span> <span class="emphasis"><em>unspecified</em></span> <a name="boost.graph_traits_mpi_graph__id893185.out_edge_iterator"></a>out_edge_iterator;
<span class="bold"><strong>typedef</strong></span> <span class="bold"><strong>int</strong></span> <a name="boost.graph_traits_mpi_graph__id893185.degree_size_type"></a>degree_size_type;
<span class="bold"><strong>typedef</strong></span> <span class="emphasis"><em>unspecified</em></span> <a name="boost.graph_traits_mpi_graph__id893185.adjacency_iterator"></a>adjacency_iterator;
<span class="bold"><strong>typedef</strong></span> counting_iterator< <span class="bold"><strong>int</strong></span> > <a name="boost.graph_traits_mpi_graph__id893185.vertex_iterator"></a>vertex_iterator;
<span class="bold"><strong>typedef</strong></span> <span class="bold"><strong>int</strong></span> <a name="boost.graph_traits_mpi_graph__id893185.vertices_size_type"></a>vertices_size_type;
<span class="bold"><strong>typedef</strong></span> <span class="emphasis"><em>unspecified</em></span> <a name="boost.graph_traits_mpi_graph__id893185.edge_iterator"></a>edge_iterator;
<span class="bold"><strong>typedef</strong></span> <span class="bold"><strong>int</strong></span> <a name="boost.graph_traits_mpi_graph__id893185.edges_size_type"></a>edges_size_type;
<span class="emphasis"><em>// <a class="link" href="graph_traits_mpi_graph__id893185.html#id893278-bb">public static functions</a></em></span>
<span class="type"><span class="bold"><strong>static</strong></span> vertex_descriptor</span> <a class="link" href="graph_traits_mpi_graph__id893185.html#id893282-bb">null_vertex</a>() ;
};</pre></div>
<div class="refsect1" title="Description">
<a name="id1404038"></a><h2>Description</h2>
<p>The specialization of <code class="computeroutput">graph_traits</code> for an MPI communicator allows a communicator with graph topology to be viewed as a graph. An MPI communicator with graph topology meets the requirements of the Graph, Incidence Graph, Adjacency Graph, Vertex List Graph, and Edge List Graph concepts from the Boost Graph Library. </p>
<div class="refsect2" title="graph_traits public static functions">
<a name="id1404054"></a><h3>
<a name="id893278-bb"></a><code class="computeroutput">graph_traits</code> public static functions</h3>
<div class="orderedlist"><ol class="orderedlist" type="1"><li class="listitem">
<pre class="literallayout"><span class="type"><span class="bold"><strong>static</strong></span> vertex_descriptor</span> <a name="id893282-bb"></a>null_vertex() ;</pre>Returns a vertex descriptor that can never refer to any valid vertex. </li></ol></div>
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