Another template/static member question

[Harvey Chapman]

I'm trying to compile the code below and keep getting this error. I'm  
not exactly sure what to do to correct it. Is there something that I  
could read that would help? What is a non_lazy_ptr?

Thank you,

Harvey


Undefined symbols:
   "Singleton<SingleClass>::ptr", referenced from:
       __ZN9SingletonI11SingleClassE3ptrE$non_lazy_ptr in ccvXYIGQ.o
ld: symbol(s) not found
collect2: ld returned 1 exit status


#include <stdio.h>

template<class Type>
class Singleton
{
public:
   static Type *ptr;

protected:
   Singleton() { ptr = NULL; }
   ~Singleton() { }
};

class SingleClass : public Singleton<SingleClass>
{
   friend class Singleton<SingleClass>;
};

template class Singleton<SingleClass>;

template <class Type> Type * Singleton<Type>::ptr;

// a test
//SingleClass * Singleton<SingleClass>::ptr;

int main()
{

   return(0);
}

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