Re: [Boost-users] boost::graph - Newbie question about vertex properties

Subject: Re: [Boost-users] boost::graph - Newbie question about vertex properties
From: Jeremiah Willcock (jewillco_at_[hidden])
Date: 2009-11-24 14:14:32

On Tue, 10 Nov 2009, Stephen Karmann wrote:

> Hello dear mailing list members,
>
> i'm new to this mailing list and hope i'm right here and that my english is not
> too annoying.
>
> I have to to some distance calculation and decided to use the
> boost::graph-framework to do this as i have to develop a C++ application using
> Visual C++ Express Edition 2008. I have to include some background details
> information in the vertices and edges of my graph and chose to append such meta
> info objects to the vertices and edges with the help of properties. I defined
> the following types in the Header-Class:
>
> [code]
> 	struct vtx_ref_t {
> 		typedef boost::vertex_property_tag kind;
> 	};
> 	struct edge_ref_t {
> 		typedef boost::edge_property_tag kind;
> 	};
>
>        // VtxMetaClass and EdgeMetaClass are some Classes containing some
>        // infos needed for calculation
> 	typedef boost::property<vtx_ref_t, VtxMetaClass*> VtxProperty;
> 	typedef boost::property<edge_ref_t, EdgeMetaClass*> EdgeProperty;
> 	typedef boost::adjacency_list<boost::vecS, boost::vecS,
>        boost::directedS, VtxProperty, EdgeProperty> MyGraphType;
>
> 	typedef boost::graph_traits<MyGraphType>::vertex_descriptor vertex_t;
> 	typedef boost::graph_traits<MyGraphType>::edge_descriptor edge_t;
> [/code]
>
> In the Main-Method i tried to use the function boost::put to append such a meta
> class object infoobj to a vertex (whose vertex descriptor vtx i only have) i
> have created somewhere else where i cannot append the infoobject cause i don't
> know at that time which one to append.
>
> [code]
>        MyGraphType graph(100);
>        vertex_t vtx = boost::add_vertex(graph);
>        VtxMetaClass* infoobj;
>        ...
> 	boost::property_map<MyGraphType, vtx_ref_t>::type vtxref =
>        get(vtx_ref_t(), graph);
> 	boost::put(vtxref, graph, vtx, infoobj);
> [/code]
>
> But i only get a compilation error telling me that:
> 1>e:\development\VC++\project\include\boost/pending/property.hpp(46) : error
> C2039: 'kind': is no element of
> 'boost::vec_adj_list_vertex_property_map<Graph,GraphPtr,ValueType,Reference,Tag>'

You are adding the graph to the put() call when you already have a 
property map.  Try changing it to either:

boost::put(vtxref, vtx, infoobj);

or:

boost::put(vtx_ref_t(), graph, vtx, infoobj);

-- Jeremiah Willcock