Ok, I found the problem and it was my mistake ! As I overloaded the adjacency_list class I just misnamed one of the template argument and the class was bound to have a list as argument for OutEdgeList ! Pierre Barbier de Reuille wrote:

Hello,

I want an undirected graph with non-multiple edges. So I use a graph defined as :

adjacencylist

But, if I insert many times the same edge with:

add_edge(2,3) add_edge(1,4) add_edge(2,3) add_edge(3,2)

I obtain in fact 3 edges 2<->3 which I really don't want. Is there something else to do to avoid having multiple edges linking the same vertices ?

And then, is there a way to user hash_set with g++-3.2 ? The problem being that hash_set is defined in the file ext/hash_set and in the namespace __gnu_cxx ...

Thanks,

-- Pierre Barbier de Reuille INRA - UMR Cirad/Inra/Cnrs/Univ.MontpellierII AMAP Botanique et Bio-informatique de l'Architecture des Plantes TA40/PSII, Boulevard de la Lironde 34398 MONTPELLIER CEDEX 5, France tel : (33) 4 67 61 65 77 fax : (33) 4 67 61 56 68