Re: [Boost-users] [BGL] Problems with remove_vertex

On Jan 29, 2007, at 2:38 PM, Adrian Boeing wrote:

Hi Jens,

Unfortunately it's all part of a larger program so I can't easily provide a small example.

Yes, I am using the vecS storage: typedef boost::adjacency_list,boost::property,boost::no_property, boost::listS > graph_type;

I'm not sure how to remove the property descriptor, there does not seem to be a boost::remove(vertex prop,graph) that I can find anywhere.

Hmmm. So, when one removes a vertex from an adjacency_list with VertexListS=vecS, it actually invalidates all of the existing vertex descriptors. So simple code like the following causes problems: graph_type::vertex_descriptor u = *vertices(g).first; graph_type::vertex_descriptor v = *(++vertices(g).first); clear_vertex(u, g); remove_vertex(u, g); adjacent_vertices(v, g); // v has been invalidated vecS is a tricky beast. I usually recommend avoiding the removal of vertices when VertexListS=vecS... it's inefficient and hard to use properly. Cheers, Doug