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<h1 class="title"><a class="reference external" href="../../../index.htm"><img align="middle" alt="Boost" class="align-middle" src="../../../boost.png" /></a> <tt class="docutils literal"><span class="pre">write_graphml</span></tt></h1>

<!-- Copyright (C) 2006  Tiago de Paula Peixoto <tiago@forked.de>

Distributed under the Boost Software License, Version 1.0. (See
accompanying file LICENSE_1_0.txt or copy at
http://www.boost.org/LICENSE_1_0.txt)

Authors: Tiago de Paula Peixoto -->
<pre class="literal-block">
template&lt;typename Graph&gt;
void
write_graphml(std::ostream&amp; out, const Graph&amp; g, const dynamic_properties&amp; dp,
              bool ordered_vertices=false);

template&lt;typename Graph, typename VertexIndexMap&gt;
void
write_graphml(std::ostream&amp; out, const Graph&amp; g, VertexIndexMap vertex_index,
              const dynamic_properties&amp; dp, bool ordered_vertices=false);
</pre>
<p>This is to write a BGL graph object into an output stream in the
<a class="reference external" href="http://graphml.graphdrawing.org/">GraphML</a> format.  Both overloads of <tt class="docutils literal"><span class="pre">write_graphml</span></tt> will emit all of
the properties stored in the <a class="reference external" href="../../property_map/doc/dynamic_property_map.html">dynamic_properties</a> object, thereby
retaining the properties that have been read in through the dual
function <a class="reference external" href="read_graphml.html">read_graphml</a>. The second overload must be used when the
graph doesn't have an internal vertex index map, which must then be
supplied with the appropriate parameter.</p>
<div class="contents topic" id="contents">
<p class="topic-title first">Contents</p>
<ul class="simple">
<li><a class="reference internal" href="#where-defined" id="id2">Where Defined</a></li>
<li><a class="reference internal" href="#parameters" id="id3">Parameters</a></li>
<li><a class="reference internal" href="#example" id="id4">Example</a></li>
<li><a class="reference internal" href="#see-also" id="id5">See Also</a></li>
<li><a class="reference internal" href="#notes" id="id6">Notes</a></li>
</ul>
</div>
<div class="section" id="where-defined">
<h1><a class="toc-backref" href="#id2">Where Defined</a></h1>
<p><tt class="docutils literal"><span class="pre">&lt;boost/graph/graphml.hpp&gt;</span></tt></p>
</div>
<div class="section" id="parameters">
<h1><a class="toc-backref" href="#id3">Parameters</a></h1>
<dl class="docutils">
<dt>OUT: <tt class="docutils literal"><span class="pre">std::ostream&amp;</span> <span class="pre">out</span></tt></dt>
<dd>A standard <tt class="docutils literal"><span class="pre">std::ostream</span></tt> object.</dd>
<dt>IN: <tt class="docutils literal"><span class="pre">VertexListGraph&amp;</span> <span class="pre">g</span></tt></dt>
<dd>A directed or undirected graph.  The
graph's type must be a model of <a class="reference external" href="VertexListGraph.html">VertexListGraph</a>. If the graph
doesn't have an internal <tt class="docutils literal"><span class="pre">vertex_index</span></tt> property map, one
must be supplied with the vertex_index parameter.</dd>
<dt>IN: <tt class="docutils literal"><span class="pre">VertexIndexMap</span> <span class="pre">vertex_index</span></tt></dt>
<dd>A vertex property map containing the indexes in the range
[0,num_vertices(g)].</dd>
<dt>IN: <tt class="docutils literal"><span class="pre">dynamic_properties&amp;</span> <span class="pre">dp</span></tt></dt>
<dd>Contains all of the vertex, edge, and graph properties that should be
emitted by the GraphML writer.</dd>
<dt>IN: <tt class="docutils literal"><span class="pre">bool</span> <span class="pre">ordered_vertices</span></tt></dt>
<dd>This tells whether or not the order of the vertices from vertices(g)
matches the order of the indexes. If <tt class="docutils literal"><span class="pre">true</span></tt>, the <tt class="docutils literal"><span class="pre">parse.nodeids</span></tt>
graph attribute will be set to <tt class="docutils literal"><span class="pre">canonical</span></tt>. Otherwise it will be
set to <tt class="docutils literal"><span class="pre">free</span></tt>.</dd>
</dl>
</div>
<div class="section" id="example">
<h1><a class="toc-backref" href="#id4">Example</a></h1>
<p>This example demonstrates using BGL-GraphML interface to write
a BGL graph into a GraphML format file.</p>
<pre class="literal-block">
enum files_e { dax_h, yow_h, boz_h, zow_h, foo_cpp,
               foo_o, bar_cpp, bar_o, libfoobar_a,
               zig_cpp, zig_o, zag_cpp, zag_o,
               libzigzag_a, killerapp, N };
const char* name[] = { &quot;dax.h&quot;, &quot;yow.h&quot;, &quot;boz.h&quot;, &quot;zow.h&quot;, &quot;foo.cpp&quot;,
                       &quot;foo.o&quot;, &quot;bar.cpp&quot;, &quot;bar.o&quot;, &quot;libfoobar.a&quot;,
                       &quot;zig.cpp&quot;, &quot;zig.o&quot;, &quot;zag.cpp&quot;, &quot;zag.o&quot;,
                       &quot;libzigzag.a&quot;, &quot;killerapp&quot; };

int main(int,char*[])
{
    typedef pair&lt;int,int&gt; Edge;
    Edge used_by[] = {
        Edge(dax_h, foo_cpp), Edge(dax_h, bar_cpp), Edge(dax_h, yow_h),
        Edge(yow_h, bar_cpp), Edge(yow_h, zag_cpp),
        Edge(boz_h, bar_cpp), Edge(boz_h, zig_cpp), Edge(boz_h, zag_cpp),
        Edge(zow_h, foo_cpp),
        Edge(foo_cpp, foo_o),
        Edge(foo_o, libfoobar_a),
        Edge(bar_cpp, bar_o),
        Edge(bar_o, libfoobar_a),
        Edge(libfoobar_a, libzigzag_a),
        Edge(zig_cpp, zig_o),
        Edge(zig_o, libzigzag_a),
        Edge(zag_cpp, zag_o),
        Edge(zag_o, libzigzag_a),
        Edge(libzigzag_a, killerapp)
     };

    const int nedges = sizeof(used_by)/sizeof(Edge);

    typedef adjacency_list&lt; vecS, vecS, directedS,
        property&lt; vertex_color_t, string &gt;,
        property&lt; edge_weight_t, int &gt;
        &gt; Graph;
    Graph g(used_by, used_by + nedges, N);

    graph_traits&lt;Graph&gt;::vertex_iterator v, v_end;
    for (boost::tie(v,v_end) = vertices(g); v != v_end; ++v)
        put(vertex_color_t(), g, *v, name[*v]);

    graph_traits&lt;Graph&gt;::edge_iterator e, e_end;
    for (boost::tie(e,e_end) = edges(g); e != e_end; ++e)
        put(edge_weight_t(), g, *e, 3);

    dynamic_properties dp;
    dp.property(&quot;name&quot;, get(vertex_color_t(), g));
    dp.property(&quot;weight&quot;, get(edge_weight_t(), g));

    write_graphml(std::cout, g, dp, true);
 }
</pre>
<p>The output will be:</p>
<pre class="literal-block">
&lt;?xml version=&quot;1.0&quot; encoding=&quot;UTF-8&quot;?&gt;
&lt;graphml xmlns=&quot;http://graphml.graphdrawing.org/xmlns/graphml&quot;  xmlns:xsi=&quot;http://www.w3.org/2001/XMLSchema-instance&quot; xsi:schemaLocation=&quot;http://graphml.graphdrawing.org/xmlns/graphml http://graphml.graphdrawing.org/xmlns/graphml/graphml-attributes-1.0rc.xsd&quot;&gt;
  &lt;key id=&quot;key0&quot; for=&quot;node&quot; attr.name=&quot;name&quot; attr.type=&quot;string&quot; /&gt;
  &lt;key id=&quot;key1&quot; for=&quot;edge&quot; attr.name=&quot;weight&quot; attr.type=&quot;int&quot; /&gt;
  &lt;graph id=&quot;G&quot; edgedefault=&quot;directed&quot; parse.nodeids=&quot;canonical&quot; parse.edgeids=&quot;canonical&quot; parse.order=&quot;nodesfirst&quot;&gt;
    &lt;node id=&quot;n0&quot;&gt;
      &lt;data key=&quot;key0&quot;&gt;dax.h&lt;/data&gt;
    &lt;/node&gt;
    &lt;node id=&quot;n1&quot;&gt;
      &lt;data key=&quot;key0&quot;&gt;yow.h&lt;/data&gt;
    &lt;/node&gt;
    &lt;node id=&quot;n2&quot;&gt;
      &lt;data key=&quot;key0&quot;&gt;boz.h&lt;/data&gt;
    &lt;/node&gt;
    &lt;node id=&quot;n3&quot;&gt;
      &lt;data key=&quot;key0&quot;&gt;zow.h&lt;/data&gt;
    &lt;/node&gt;
    &lt;node id=&quot;n4&quot;&gt;
      &lt;data key=&quot;key0&quot;&gt;foo.cpp&lt;/data&gt;
    &lt;/node&gt;
    &lt;node id=&quot;n5&quot;&gt;
      &lt;data key=&quot;key0&quot;&gt;foo.o&lt;/data&gt;
    &lt;/node&gt;
    &lt;node id=&quot;n6&quot;&gt;
      &lt;data key=&quot;key0&quot;&gt;bar.cpp&lt;/data&gt;
    &lt;/node&gt;
    &lt;node id=&quot;n7&quot;&gt;
      &lt;data key=&quot;key0&quot;&gt;bar.o&lt;/data&gt;
    &lt;/node&gt;
    &lt;node id=&quot;n8&quot;&gt;
      &lt;data key=&quot;key0&quot;&gt;libfoobar.a&lt;/data&gt;
    &lt;/node&gt;
    &lt;node id=&quot;n9&quot;&gt;
      &lt;data key=&quot;key0&quot;&gt;zig.cpp&lt;/data&gt;
    &lt;/node&gt;
    &lt;node id=&quot;n10&quot;&gt;
      &lt;data key=&quot;key0&quot;&gt;zig.o&lt;/data&gt;
    &lt;/node&gt;
    &lt;node id=&quot;n11&quot;&gt;
      &lt;data key=&quot;key0&quot;&gt;zag.cpp&lt;/data&gt;
    &lt;/node&gt;
    &lt;node id=&quot;n12&quot;&gt;
      &lt;data key=&quot;key0&quot;&gt;zag.o&lt;/data&gt;
    &lt;/node&gt;
    &lt;node id=&quot;n13&quot;&gt;
      &lt;data key=&quot;key0&quot;&gt;libzigzag.a&lt;/data&gt;
    &lt;/node&gt;
    &lt;node id=&quot;n14&quot;&gt;
      &lt;data key=&quot;key0&quot;&gt;killerapp&lt;/data&gt;
    &lt;/node&gt;
    &lt;edge id=&quot;e0&quot; source=&quot;n0&quot; target=&quot;n4&quot;&gt;
      &lt;data key=&quot;key1&quot;&gt;3&lt;/data&gt;
    &lt;/edge&gt;
    &lt;edge id=&quot;e1&quot; source=&quot;n0&quot; target=&quot;n6&quot;&gt;
      &lt;data key=&quot;key1&quot;&gt;3&lt;/data&gt;
    &lt;/edge&gt;
    &lt;edge id=&quot;e2&quot; source=&quot;n0&quot; target=&quot;n1&quot;&gt;
      &lt;data key=&quot;key1&quot;&gt;3&lt;/data&gt;
    &lt;/edge&gt;
    &lt;edge id=&quot;e3&quot; source=&quot;n1&quot; target=&quot;n6&quot;&gt;
      &lt;data key=&quot;key1&quot;&gt;3&lt;/data&gt;
    &lt;/edge&gt;
    &lt;edge id=&quot;e4&quot; source=&quot;n1&quot; target=&quot;n11&quot;&gt;
      &lt;data key=&quot;key1&quot;&gt;3&lt;/data&gt;
    &lt;/edge&gt;
    &lt;edge id=&quot;e5&quot; source=&quot;n2&quot; target=&quot;n6&quot;&gt;
      &lt;data key=&quot;key1&quot;&gt;3&lt;/data&gt;
    &lt;/edge&gt;
    &lt;edge id=&quot;e6&quot; source=&quot;n2&quot; target=&quot;n9&quot;&gt;
       &lt;data key=&quot;key1&quot;&gt;3&lt;/data&gt;
    &lt;/edge&gt;
    &lt;edge id=&quot;e7&quot; source=&quot;n2&quot; target=&quot;n11&quot;&gt;
      &lt;data key=&quot;key1&quot;&gt;3&lt;/data&gt;
    &lt;/edge&gt;
    &lt;edge id=&quot;e8&quot; source=&quot;n3&quot; target=&quot;n4&quot;&gt;
      &lt;data key=&quot;key1&quot;&gt;3&lt;/data&gt;
    &lt;/edge&gt;
    &lt;edge id=&quot;e9&quot; source=&quot;n4&quot; target=&quot;n5&quot;&gt;
      &lt;data key=&quot;key1&quot;&gt;3&lt;/data&gt;
    &lt;/edge&gt;
    &lt;edge id=&quot;e10&quot; source=&quot;n5&quot; target=&quot;n8&quot;&gt;
      &lt;data key=&quot;key1&quot;&gt;3&lt;/data&gt;
    &lt;/edge&gt;
    &lt;edge id=&quot;e11&quot; source=&quot;n6&quot; target=&quot;n7&quot;&gt;
      &lt;data key=&quot;key1&quot;&gt;3&lt;/data&gt;
    &lt;/edge&gt;
    &lt;edge id=&quot;e12&quot; source=&quot;n7&quot; target=&quot;n8&quot;&gt;
      &lt;data key=&quot;key1&quot;&gt;3&lt;/data&gt;
    &lt;/edge&gt;
    &lt;edge id=&quot;e13&quot; source=&quot;n8&quot; target=&quot;n13&quot;&gt;
      &lt;data key=&quot;key1&quot;&gt;3&lt;/data&gt;
    &lt;/edge&gt;
    &lt;edge id=&quot;e14&quot; source=&quot;n9&quot; target=&quot;n10&quot;&gt;
      &lt;data key=&quot;key1&quot;&gt;3&lt;/data&gt;
    &lt;/edge&gt;
    &lt;edge id=&quot;e15&quot; source=&quot;n10&quot; target=&quot;n13&quot;&gt;
      &lt;data key=&quot;key1&quot;&gt;3&lt;/data&gt;
    &lt;/edge&gt;
    &lt;edge id=&quot;e16&quot; source=&quot;n11&quot; target=&quot;n12&quot;&gt;
      &lt;data key=&quot;key1&quot;&gt;3&lt;/data&gt;
    &lt;/edge&gt;
    &lt;edge id=&quot;e17&quot; source=&quot;n12&quot; target=&quot;n13&quot;&gt;
      &lt;data key=&quot;key1&quot;&gt;3&lt;/data&gt;
    &lt;/edge&gt;
    &lt;edge id=&quot;e18&quot; source=&quot;n13&quot; target=&quot;n14&quot;&gt;
      &lt;data key=&quot;key1&quot;&gt;3&lt;/data&gt;
    &lt;/edge&gt;
  &lt;/graph&gt;
&lt;/graphml&gt;
</pre>
</div>
<div class="section" id="see-also">
<h1><a class="toc-backref" href="#id5">See Also</a></h1>
<p>_read_graphml</p>
</div>
<div class="section" id="notes">
<h1><a class="toc-backref" href="#id6">Notes</a></h1>
<blockquote>
<ul class="simple">
<li>Note that you can use GraphML file write facilities without linking
against the <tt class="docutils literal"><span class="pre">boost_graph</span></tt> library.</li>
</ul>
</blockquote>
</div>
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