Arthur, see the following: http://www.boost.org/libs/graph/doc/using_adjacency_list.html ^- see specifically "Choosing the EdgeList type".. Sequence vs. AssociativeContainer vs. UniqueAssociativeContainer http://cvs.sourceforge.net/cgi-bin/viewcvs.cgi/boost/boost/libs/graph/example/container_gen.cpp?rev=1.1&content-type=text/vnd.viewcvs-markup ^- container_gen.cpp example HTH - Chris "Arthur" <arthurc@tropicnetworks.com> wrote in message news:bbnl0i+k498@eGroups.com...

I'm trying to use this graph class without detailed reading. I can't find a decent, clear example of doing this. I have a simple graph:

typedef adjacency_list<list, listS, bidirectionalS> Graph;

What do I do to prevent parallel edges to be inserted?

Thanks for any help offered, Arthur

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