Discovered the answer to my question. The value_type of edge_iterator is an edge_descriptor. Also discovered my code problem. An edge_descriptor does not have a operator< method. Jeff Holle wrote:
What is the relationship between an "edge_descriptor" and what an edge_iterator dereferences?
I'm having problems coding the following:
myFunct(GraphT& g) { typedef graph_traits<GraphT>::edge_descriptor Edge; typedef map< Edge, Edge_Datum> Edge_Data; Edge_Data edge_data; graph_traits<GraphT>::edge_iterator ei, ei_end; for(tie(ei,ei_end)=edges(graph);ei!=ei_end;++ei) edge_data.insert( make_pair(*ei, Edge_Data())); << blows up here. }
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