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

Subject: [Boost-users] [Graph] Checking if a vertex_descriptor is valid
From: Florian.PONROY_at_[hidden]
Date: 2009-04-01 09:19:34

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. : [phone]
Fax : [phone]
Email : florian.ponroy_at_[hidden]