Re: [Boost-users] [BGL] more difficulties in accessing bundled properties

From: Shufei Fan (fansf_at_[hidden])
Date: 2007-04-16 17:26:03

Stephan Diederich <stephan.diederich <at> googlemail.com> writes:

> > Are you saying initialize the property-pointer in the class GA's 
constructor?
> 
> I just wanted to get a working example ;)
> 
> > I tried this, I am on windows vc2003.net, but that still doesnot compile. 
I've
> > switched to using local variable instead(although more local definitions, 
but
> > easier to get it work anyway)
> 
> Maybe we can get Doug (the one who made the Bundled Properties) to
> comment on this...
> 
> Cheers,
> Stephan
> 

Simplified sample as follows, produced the error.

#include <boost/config.hpp>
#include <iostream>                      // for std::cout
#include <fstream>                      // for std::cout
#include <utility>                       // for std::pair
#include <algorithm>                     // for std::for_each
#include <boost/utility.hpp>             // for boost::tie
#include <boost/graph/graph_traits.hpp>  // for boost::graph_traits
#include <boost/graph/adjacency_list.hpp>
#include <boost/graph/graphviz.hpp>

using namespace boost;

struct Node
{
        int count;//pixel number for this region
        double mode[3];//region mode (RGB)
};

struct Edge
{
                  double	eWeight;//normalized number of common boundary 
points
};

//For accessing mode[3]:
//pointer to Node-Mode
//new specialization of property_map for bundles with arrays
namespace boost{
    template <typename Graph, typename T, typename Bundle, unsigned int Size>
  struct property_map<Graph, T (Bundle::*) [Size]>  
  {
private:
    typedef graph_traits<Graph> traits;
    typedef typename Graph::vertex_bundled vertex_bundled;
    typedef typename Graph::edge_bundled edge_bundled;
    typedef typename mpl::if_c<(detail::is_vertex_bundle<vertex_bundled, 
edge_bundled, Bundle>::value), 
            typename traits::vertex_descriptor,
            typename traits::edge_descriptor>::type
      descriptor;
    typedef typename mpl::if_c<(detail::is_vertex_bundle<vertex_bundled, 
edge_bundled, Bundle>::value), 
            vertex_bundled,
            edge_bundled>::type
      actual_bundle;
    
public:
            typedef bundle_property_map<Graph, descriptor, actual_bundle, T
[Size]> type;
    typedef bundle_property_map<const Graph, descriptor, actual_bundle, const T
[Size]> 
      const_type;
  };
    
};

typedef boost::adjacency_list<
    boost::listS, boost::listS, boost::bidirectionalS,
        boost::property<vertex_index_t, int, Node>, Edge> Graph;

class GA {
//data members
        //Number of points 
        int		nRowPnt;
        int		nColPnt;

        //Graph variables
        Graph *rowGraph;
        Graph *colGraph;

        boost::property_map<Graph, vertex_index_t>::type L_vertex_id, 
R_vertex_id;
        boost::property_map<Graph, int Node::*>::type nmt;

//methods members
public:

        //default constructor
        GA(): 
                nRowPnt (0),
                nColPnt	(0),
                rowGraph(NULL),
                colGraph(NULL)
                {
                        rowGraph = new Graph();
                        colGraph = new Graph();
                        nmt = get(&Node::count, *rowGraph);
                }

        ~GA()
        {
                delete rowGraph;
                delete colGraph;
        }

};

int main()
{ 
        GA ga;
        return 0;
}

///////////////////////////////////////////////////////////////////////////////
error: 
xxxx...error C2512: 'boost::bundle_property_map<Graph,Descriptor,Bundle,T>' : 
no appropriate default constructor available
        with
        [
            Graph=Graph,
            Descriptor=boost::property_map<Graph,int Node::* >::descriptor,
            Bundle=Node,
            T=int
        ]
xxxxxxxxxxx............................
try1 - 1 error(s), 0 warning(s)

Thanks,

Shufei