[Boost-users] vertex_descriptor NULL check

From: Hardik Kheskani (hardik.kheskani_at_[hidden])
Date: 2008-03-26 06:16:04

I am using adjacent lists and using vertex_descriptors.
Is there a way to check if the vertex_descriptor is NULL or 'not assigned' yet?

graph_traits < adjacent_list_graph >::vertex_descriptor vd ;

can I assign this to NULL ?
and can I use vd == NULL or vd != NULL ?

Any help/info is greatly appreciated.
Hardik
 
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