Templates and type casts

Hi, i have a simple compile time error which i cant get rid of, and was wondering if anyone can help me out.

Quote:

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Compiling...
Lattice.cpp
Main.cpp
pcp2\lattice.cpp(15) : error C2440: '=' : cannot convert from 'class LatticeNode<T> *' to 'class LatticeNode<class Juxtacrine> *'
Types pointed to are unrelated; conversion requires reinterpret_cast, C-style cast or function-style cast
c:\program files\microsoft visual studio\vc98\include\xmemory(59) : while compiling class-template member function '__thiscall Lattice<class Juxtacrine,500>::~Lattice<class Juxtacrine,500>(void)'
Error executing cl.exe.

PCP2.exe - 1 error(s), 0 warning(s)

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Ok thats the error and heres the code its related to.

Code:

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template <class T> class LatticeNode {

        public:
                int num;
                T t;

                //next/prev nodes
                LatticeNode *next;
                LatticeNode *prev;
       
                //default constructor
                LatticeNode();

        private:


};

template< class T, int size> class Lattice
{
        public:

                Lattice();
                ~Lattice();

                int dimensions();
                void remainder_cells();

                void set_links();

                void add(int i, int j);
                void remove(int i, int j);

        private:

                int width, height;

                LatticeNode* current;
                LatticeNode* head;
                LatticeNode* tail;

                void init();
};

template <class T, int size> Lattice<T,size>::~Lattice()
{
        LatticeNode *save;

        for (current = head; current != tail; current = save) {
            save = current->next;
                delete current;
        }
       
        delete tail;
}

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The code in red is where i guess its referring to.

Im not sure how to re-cast the 'save' variable into what the compiler suggests.. any ideas on how to solve this?

In your Lattice class you need to specify template parameters to your LatticeNode pointers. Like so:

Code:

---

LatticeNode<T>* current;
LatticeNode<T>* head;
LatticeNode<T>* tail;

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And then in your destructor..

Code:

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LatticeNode<T> *save;

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Also you might want to make sure you have a constructor body.

Excellent thanks, i completely missed that !