[boost] Help needed with BGL & multi_index_container

28 Jan 2005

      Hi there,

I need an advanced container which allows me to access
my data over number of different indices. That is
exactly what for boost::multi_index_container was
made. But, my data items also have relationships with
other data in the same container, which could be
represented as directed graph.

So, I have made a custom container, which aggregates
multi_index_container (MIC) to store data items and a
graph (BGL) to store relationships. To allow switching
from MIC to walk over relationships, as an additional
field of my item in MIC I store BGL vertex; as vertex
property in graph I store the key of unique index in
MIC. So, MIC and BGL refer to each other. But, it is
difficult to have those two containers in sync.

So, I made another attempt to have MIC as customized
vertex storage. I succeed two write the code for it
(see it below). It also compiles and links :-).
Unfortunately, I can not add neither vertices not
edges. If I try to add vertex as in commeted code
below, an error errors that there is no convertion
from vertex property to vertex descriptor (error
message is below).

What's wrong?

My another question is: how can I get access to my
MIC stored in graph? I would like to use its indices.

Best wishes,
Alexander

--------- sample code -----------
#include <iostream>

#include <boost/multi_index_container.hpp>
#include <boost/multi_index/ordered_index.hpp>

#include <boost/graph/adjacency_list.hpp>

using namespace boost;
using namespace boost::multi_index;

using namespace std;

struct MICSelector {};

struct Item
{
  Item(int _a=0, int _b=0, int _c=0)
  : a(_a), b(_b), c(_c) {}

  int a,b,c;
};

struct ItemHolder
{
  ItemHolder(int id=0, const Item item=Item())
  : m_ID(id), m_item(item) {}

  int  m_ID;
  Item m_item;
};

struct ItemHolderKey
{
  typedef int result_type;
  int operator()(const ItemHolder& v) const
  { return v.m_ID; }
};

template<class ValueType>
struct MICWrapper
{
  typedef multi_index_container
    <
      ValueType,
      indexed_by
      <
        ordered_unique< ItemHolderKey >
      >
    > type;
};

namespace boost
{
  // the specialization for your selector
  template<class ValueType>
  struct container_gen<MICSelector, ValueType>
  {
    typedef typename MICWrapper<ValueType>::type type;
  };

  template <>
  struct parallel_edge_traits<MICSelector> {
  typedef allow_parallel_edge_tag type;
  };
};

typedef adjacency_list
    < listS, MICSelector,
      bidirectionalS, ItemHolder
    > MG;

int tmain(int argc, char* argv[])
{

  MG mg;

/*
  ItemHolder IH( 1, Item(1) );

  add_vertex( &IH, mg );

//  add_edge(
//    ItemHolder( 1, Item(1) ),
//    ItemHolder( 2, Item(2) ),
//    mg );
*/

  cout << typeid(
boost::graph_traits<MG>::vertex_descriptor ).name();

  return 0;
}
--------- sample code -----------

----------- error message -------------
Compiling...
MIC_BGL.cpp
c:\test\MIC_BGL.cpp(87) : error C2664:
'boost::add_vertex' : cannot convert parameter 1 from
'ItemHolder *__w64 ' to 'const
boost::detail::adj_list_gen<Graph,VertexListS,OutEdgeListS,DirectedS,VertexProperty,EdgeProperty,GraphProperty,EdgeListS>::config::vertex_property_type
&'
  with
  [

Graph=boost::adjacency_list<boost::listS,MICSelector,boost::bidirectionalS,ItemHolder>,
    VertexListS=MICSelector,
    OutEdgeListS=boost::listS,
    DirectedS=boost::bidirectionalS,

VertexProperty=boost::detail::retag_property_list<boost::vertex_bundle_t,ItemHolder>::type,

EdgeProperty=boost::detail::retag_property_list<boost::edge_bundle_t,boost::no_property>::type,
    GraphProperty=boost::no_property,
    EdgeListS=boost::listS
  ]
  Reason: cannot convert from 'ItemHolder *__w64 ' to
'const
boost::detail::adj_list_gen<Graph,VertexListS,OutEdgeListS,DirectedS,VertexProperty,EdgeProperty,GraphProperty,EdgeListS>::config::vertex_property_type'
  with
  [

Graph=boost::adjacency_list<boost::listS,MICSelector,boost::bidirectionalS,ItemHolder>,
    VertexListS=MICSelector,
    OutEdgeListS=boost::listS,
    DirectedS=boost::bidirectionalS,

VertexProperty=boost::detail::retag_property_list<boost::vertex_bundle_t,ItemHolder>::type,

EdgeProperty=boost::detail::retag_property_list<boost::edge_bundle_t,boost::no_property>::type,
    GraphProperty=boost::no_property,
    EdgeListS=boost::listS
  ]
  No constructor could take the source type, or
constructor overload resolution was ambiguous
----------- error message -------------

__________________________________ 
Do you Yahoo!? 
Yahoo! Mail - Find what you need with new enhanced search.
http://info.mail.yahoo.com/mail_250

[boost] Help needed with BGL & multi_index_container

Me here