Re: [Boost-Users] What is the relationship between BGL's edge_descriptor and edge_iterator?

From: Jeff Holle (jeff.holle_at_[hidden])
Date: 2003-03-14 02:27:32

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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