Re: [Boost-users] BGL: Bundled Properties with pointer type

From: Camilo La Rota (camilo.larota_at_[hidden])
Date: 2007-10-19 12:17:24

Hello Benoît,

I am not a BGL expert at all and I am not sure about what you want to do.
However, I will give you my humble opinion or advice, but it can be wrong...

I think that it is wrong to pass a pointer to structure type as a bundle 
property template parameter and that it must be simply a structure.
Why do you do that ?  There's something special that you want to do ?
Why don't you simply pass the structure type ?
( typedef boost::adjacency_list <vecS, vecS, undirectedS, NodeProperty, 
EdgeProperty> BoostGraph_t;)

Camilo

Benoît Dagon wrote:
> Hi all,
> 
> It's my first time submitting a question on a newsgroup so pardon me if I'm 
> wrong in my way of doing.
> 
> I have a graph of type BoostGraph_t defined like
> 
> typedef boost::adjacency_list <vecS, vecS, undirectedS, NodeProperty*, 
> EdgeProperty*> BoostGraph_t;
> 
> with vertex and edge properties types defined as pointer on the following 
> stuctures
> 
> struct EdgeProperty {
>   long    m_id;
>   double  m_length;
> };
> 
> struct NodeProperty {
>     long m_id;
> };
> 
> I'm now trying to use the dijkstra_shortest_paths() function with the edge 
> length as parameter for the weigh_map function argument. But the call to the 
> following function
> 
> get(&EdgeProperty::m_length, m_graph);
> 
> returns me the following errors
> 
> ******
> e:\Boost\boost\graph\properties.hpp(337) : error C2825: 'Bundle::*': cannot 
> form a qualified name
> e:\Boost\boost\graph\properties.hpp(337) : error C2226: syntax error : 
> unexpected type 'Graph'
> e:\Boost\boost\graph\properties.hpp(337) : error C2334: unexpected token(s) 
> preceding ':'; skipping apparent function body
> e:\Boost\boost\graph\properties.hpp(342) : error C2825: 'Bundle::*': cannot 
> form a qualified name
> e:\Boost\boost\graph\properties.hpp(342) : error C2657: '`global namespace'::*'
> found at the start of a statement (did you forget to specify a type?)
> e:\Boost\boost\graph\properties.hpp(342) : error C2653: 'operator``global 
> namespace''' : is not a class or namespace name
> e:\Boost\boost\graph\properties.hpp(342) : error C2501: 
> 'boost::bundle_property_map<Graph,Descriptor,Bundle,T>::pm' : missing 
> storage-class or type specifiers
>         with
>         [   Graph=boost::adjacency_list<boost::vecS,boost::vecS,
>         boost::undirectedS,NodeProperty *,EdgeProperty *>,
>             Descriptor=boost::property_map<boost::adjacency_list<boost::vecS,
>             boost::vecS,boost::undirectedS,NodeProperty *,EdgeProperty *>,
>             double EdgeProperty::* >::descriptor,
>             Bundle=boost::property_map<boost::adjacency_list<boost::vecS,
>             boost::vecS,boost::undirectedS,NodeProperty *,EdgeProperty *>,
>             double EdgeProperty::* >::actual_bundle,
>             T=double
>         ]
> ******
> 
> I know it's working correctly if I use NodeProperty and EdgeProperty for graph 
> template arguments instead of pointers. But I would like to know if it's 
> possible to do it in that way and how would be the correct syntax for the get() 
> to work properly.
> 
> Many thanks in advance for your help!
> ~Benoît
> 
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