[Boost-users] [Graph] Checking if a vertex_descriptor is valid

Hi, I want to check if a vertex_descriptor is valid before using it. As I saw on this list, I perform the following test : Graph_t graph(10); vertexDescriptor srcVertex = boost::vertex(424242, graph); if (Graph_t::null_vertex() == boost::vertex(424242, graph)) { return; } Obviously, vertex indice 424242 does not exist, but test fails, and function does not return, leading the a crash of the following algorithm (BFS or Dijkstra). What did I do wrong? Thanks for your help. -- Florian PONROY Thales Land & Joint France Tel. : +33(0)1 41 304 363 Fax : +33(0)1 41 303 560 Email : florian.ponroy@fr.thalesgroup.com