Re: [boost] [multi_index] invalid expression as template parameter

From: Tal Agmon (tal.boost_at_[hidden])
Date: 2006-05-22 12:18:35

Please see below code

#CODE BEGIN
#include <boost/multi_index_container.hpp>
#include <boost/multi_index/ordered_index.hpp>
#include <boost/multi_index/mem_fun.hpp>
#include <boost/shared_ptr.hpp>
#include <boost/enable_shared_from_this.hpp>

typedef int handle;
typedef int group_id;

struct NodeBase :boost::enable_shared_from_this<NodeBase>{
        virtual group_id memberOf()const=0;
        virtual handle getHandle()const=0;
};

struct NodeType: NodeBase {

 NodeType(handle h,group_id gid):h(h),gid(gid){}

 group_id memberOf()const{return gid;}
 handle   getHandle()const{return h;}

private:
 group_id gid;
 handle   h;

};

typedef boost::multi_index::multi_index_container<
 boost::shared_ptr<NodeBase>,
 boost::multi_index::indexed_by<
   boost::multi_index::ordered_unique<
     BOOST_MULTI_INDEX_CONST_MEM_FUN(NodeBase,handle,getHandle)
   >,
   boost::multi_index::ordered_non_unique<
     BOOST_MULTI_INDEX_CONST_MEM_FUN(NodeBase,group_id,memberOf)
   >
 >
> NodePtrSet;

int main()
{
 NodePtrSet ns;

 typedef boost::shared_ptr<NodeBase> element_type;

 ns.insert(element_type(new NodeType(0,0)));
 ns.insert(element_type(new NodeType(1,0)));
 ns.insert(element_type(new NodeType(2,1)));

 return 0;
}

#CODE END

On 5/22/06, Tal Agmon <tal.boost_at_[hidden]> wrote:
> Hi Joaquin,
>
> NodeBase is an interface
>
> struct NodeBase{ virtual group_id memberOf()const=0; ...};
>
>
>  NodeBase<<interface >> used by NodeCommon and other Nodes uses
> NodeCommon in a relationship of is-a
>
>
> Best Regards,
> Tal Agmon
>
>
>
> On 5/22/06, Joaquín Mª López Muñoz <joaquin_at_[hidden]> wrote:
> > Tal Agmon ha escrito:
> >
> > > Hello,
> > >
> > > I use multi_index as follow with success:
> > >
> > > typedef boost::multi_index::multi_index_container<
> > >                   boost::shared_ptr<NodeBase>,
> > >                   boost::multi_index::indexed_by<
> > >                   boost::multi_index::ordered_unique<
> > >                           BOOST_MULTI_INDEX_CONST_MEM_FUN(NodeBase, handle, getHandle)
> > >                         >,
> > >                   boost::multi_index::ordered_non_unique<
> > >                           BOOST_MULTI_INDEX_CONST_MEM_FUN(NodeBase, group_id, memberOf)
> > >                         >
> > >                   >
> > >                 > NodePtrSet;
> > >
> > > but I would like NodeBase inherite boost::enable_shared_from_this<NodeBase>
> > > I get error C2964: invalid expression as template parameter using msvc 6
> > >
> > > any idea?
> >
> > Hello Tal,
> >
> > Some more context is needed: the following complete snippet compiles and works
> > fine in MSVC 6.5, so your problem must depend on some other circumstance that
> > you haven't described sufficiently:
> >
> > ******** BEGIN CODE ********
> > #include <boost/multi_index_container.hpp>
> > #include <boost/multi_index/ordered_index.hpp>
> > #include <boost/multi_index/mem_fun.hpp>
> > #include <boost/shared_ptr.hpp>
> > #include <boost/enable_shared_from_this.hpp>
> >
> > typedef int handle;
> > typedef int group_id;
> >
> > struct NodeBase:boost::enable_shared_from_this<NodeBase>
> > {
> >  NodeBase(handle h,group_id gid):h(h),gid(gid){}
> >
> >  group_id memberOf()const{return gid;}
> >  handle   getHandle()const{return h;}
> >
> > private:
> >  group_id gid;
> >  handle   h;
> > };
> >
> > typedef boost::multi_index::multi_index_container<
> >  boost::shared_ptr<NodeBase>,
> >  boost::multi_index::indexed_by<
> >    boost::multi_index::ordered_unique<
> >      BOOST_MULTI_INDEX_CONST_MEM_FUN(NodeBase,handle,getHandle)
> >    >,
> >    boost::multi_index::ordered_non_unique<
> >      BOOST_MULTI_INDEX_CONST_MEM_FUN(NodeBase,group_id,memberOf)
> >    >
> >  >
> > > NodePtrSet;
> >
> > int main()
> > {
> >  NodePtrSet ns;
> >
> >  typedef boost::shared_ptr<NodeBase> element_type;
> >
> >  ns.insert(element_type(new NodeBase(0,0)));
> >  ns.insert(element_type(new NodeBase(1,0)));
> >  ns.insert(element_type(new NodeBase(2,1)));
> >
> >  return 0;
> > }
> >
> > ******** END CODE ********
> >
> > Could you maybe come up with a reproducible test case showing the problem?
> >
> > Best regards,
> >
> > Joaquín M López Muñoz
> > Telefónica, Investigación y Desarrollo
> >
> > _______________________________________________
> > Unsubscribe & other changes: http://lists.boost.org/mailman/listinfo.cgi/boost
> >
>