[boost] another BGL::johnson_all_pairs_shortest_path question

Hello, When I use an adjacency_list 'A' with boost::vecS for the vertices, is the index 'i' in the distance array then guaranteed to be the vertex index of vertex boost::vertices(A)+i ? andreas ps.: Sorry for the repost, but as I didn't see my posting after 10 minutes, and as another of my mails appeared before, I reposted.