CellParentTreeStrategy.h

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#ifndef GfxTL__CELLPARENTTREESTRATEGY_HEADER__
#define GfxTL__CELLPARENTTREESTRATEGY_HEADER__
 
namespace GfxTL
{
 
    template <class InheritedStrategyT>
    struct CellParentTreeStrategy
    {
        typedef typename InheritedStrategyT::value_type value_type;
 
        template <class BaseT>
        class StrategyBase;
 
        class CellData : public InheritedStrategyT::CellData
        {
        public:
            template <class BaseT>
            friend class StrategyBase;
            typedef typename InheritedStrategyT::CellData BaseType;
 
        private:
            CellData* m_parent;
        };
 
        template <class BaseT>
        class StrategyBase : public InheritedStrategyT::template StrategyBase<BaseT>
        {
        public:
            typedef typename InheritedStrategyT::template StrategyBase<BaseT> BaseType;
            typedef typename BaseType::CellType CellType;
 
            const CellType* const
            CellParent(const CellType& c) const
            {
                return (const CellType* const)c.m_parent;
            }
 
            CellType* const
            CellParent(CellType& c)
            {
                return (CellType*)c.m_parent;
            }
 
        protected:
            class BuildInformation : public BaseType::BuildInformation
            {
            public:
                CellType*
                Parent() const
                {
                    return m_parent;
                }
 
                void
                Parent(CellType* p)
                {
                    m_parent = p;
                }
 
            private:
                CellType* m_parent;
            };
 
            template <class BuildInformationT>
            void
            InitRootBuildInformation(BuildInformationT* bi)
            {
                BaseType::InitRootBuildInformation(bi);
                bi->Parent(NULL);
            }
 
            template <class BuildInformationT>
            void
            InitBuildInformation(const CellType& parent,
                                 const BuildInformationT& parentInfo,
                                 unsigned int childIdx,
                                 BuildInformationT* bi)
            {
                BaseType::InitBuildInformation(parent, parentInfo, childIdx, bi);
                bi->Parent(const_cast<CellType*>(&parent));
            }
 
            template <class BuildInformationT>
            void
            InitCell(const CellType& parent,
                     const BuildInformationT& parentInfo,
                     unsigned int childIdx,
                     const BuildInformationT& bi,
                     CellType* cell)
            {
                BaseType::InitCell(parent, parentInfo, childIdx, bi, cell);
                cell->m_parent = bi.Parent();
            }
        };
    };
 
}; // namespace GfxTL
 
#endif