Hi Volodya, On Wed, 29 Jan 2003, Vladimir Prus wrote: ghost> ghost> Oh.. I only now realized how to use ReabablePropertyGraph concept: ghost> ghost> function_requires< ReadablePropertyGraphConcept<G, edge, edge_weight_t> >(); ghost> ghost> Are you suggesting that this become ghost> ghost> function_requires< EdgePropertyGraphConcept<G, edge_weight_t> >(); ghost> ghost> and the same split done to PropertyGraphConcept and LvaluePropertyGraphConcept?
I'm not so sure that change is worth it because the Edge/Vertex versions would look exactly the same except for name unless I am mistaken. ghost> I agree. The type basically is a structure, which fields are not named in a ghost> regular C++ way, but are identified by type. A subscript operator can take the ghost> "tag" type and return the value (or reference to it). Lookings at the code, ghost> it seems like this is actually implemented. ghost> BTW the following code does not compile for me at the moment. Is it correct? ghost> ghost> typedef adjacency_list<vecS, vecS, property<vertex_name_t, int, ghost> property<vertex_distance_t, int> > > G; ghost> ghost> vertex_property<G>::type p; ghost> // p[vertex_edge_t()] = 10; No, operator[] is not supported for the property class, though it is supported for property maps (I know, the naming here is a bit confusing). ghost> I think the best approach would be to make this concept explicit, and ghost> independent from BGL. Something like ghost> ghost> type_indexed_container< ghost> mpl::list< ghost> pair<vertex_name_t, int >, ghost> pair<vertex_distance_t, int> > > c; ghost> c[vertex_name_t()] = 10; ghost> I wonder if something like this already exists... I vaguely recall ghost> someone was doing that. Yes, Emily Winch was working on this, and I thought she was going to submit to boost. The following URL has a paper she wrote about this. http://www.oonumerics.org/tmpw01/schedule.html Cheers, Jeremy ---------------------------------------------------------------------- Jeremy Siek http://php.indiana.edu/~jsiek/ Ph.D. Student, Indiana Univ. B'ton email: [EMAIL PROTECTED] C++ Booster (http://www.boost.org) office phone: (812) 855-3608 ---------------------------------------------------------------------- _______________________________________________ Unsubscribe & other changes: http://lists.boost.org/mailman/listinfo.cgi/boost
