Re: [Boost-users] [graph]

Does "add_vertex" check the existence of added vertices of given index? No, it doesn't. Or I do something wrong.

For a short answer: never. For a longer answer... It looks like vertices are dynamically allocated and the vertex set (listS, setS, etc.) stores pointers to those vertices. In the case of associate containers, the key_type is just the pionter value. In otherwords, add_vertex will never look for a previous instance of the vertex. Andrew Sutton andrew.n.sutton@gmail.com