[Boost-users] graph type used in BGL function "connected_components()"

Hi, I have a question about the graph type used in BGL function "connected_components()". When I define the graph type to be: adjacency_list<vecS, vecS, undirectedS> Everything is OK. When I change the graph type to be: adjacency_list<listS, listS, undirectedS> I got a lot of compilation error messages. Anybody knows why is so? Was "connected_components()" only implemented on one particular implementaton of graphs like vecS? Best regards, Qiaofeng