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POBoost Graph Library: Bundled Properties and iterating across edges
 

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    <p>Just trying to get my head around the Boost Graph Library and I have a few questions. I'm writing some code which is a wrapper class around a BGL graph. The idea is that I can manipulate the graph however I want, then call a wrapper method to output the graph in GEXF (XML) format.</p> <p>My code is something like this:</p> <pre><code>struct Vertex { std::string label; ... }; struct Edge { std::string label; double weight; ... }; typedef boost::adjacency_list&lt;boost::vecS, boost::vecS, boost::directedS, Vertex, Edge&gt; GraphType; template &lt;typename Graph&gt; class GEXF { private: Graph graph; ... }; template &lt;typename Graph&gt; void GEXF&lt;Graph&gt;::buildXML() { ... // output the edges property_map&lt;adjacency_list&lt;&gt;, edge_index_t&gt;::type edge_id = get(edge_index, graph); GraphType::edge_iterator e, e_end; for(tie(e, e_end) = edges(graph); e != e_end; ++e) { xmlpp::Element *edge = ePtr-&gt;add_child("edge"); // next line gives an error, property not found edge-&gt;set_attribute("id", tostring&lt;size_t&gt;(get(edge_id, *e))); edge-&gt;set_attribute("source", tostring&lt;size_t&gt;(source(*e, graph))); edge-&gt;set_attribute("target", tostring&lt;size_t&gt;(target(*e, graph))); } } ... // instantiate in main(): GEXF&lt;GraphType&gt; gexf; </code></pre> <p>Here are my questions:</p> <ol> <li><p>When I use bundled properties, I can access vertex_index, but I can't access edge_index. How do I get access to edge indices?</p></li> <li><p>In the code above, I wanted to keep the GEXF class generic, but I ran into a problem when I tried to declare <code>Graph::edge_iterator e, e_end;</code> The above code works, but it's using a concrete type. How should I declare the edge_iterator generically?</p></li> </ol>
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