Adding high score capability to MS Solitaire

#ifndef TSINGLETON_TEMPLATE
#define TSINGLETON_TEMPLATE

//////////////////////////////////////////////////////////////////////////////////
// TSingleton template class is used to transform other classes into a singleton.
// Example:
// typedef TSingleton<CSomeClass> STSomeClass;
// STSomeClass::InstPtr STSomeClass::sm_ptr;
// and from then on use:
// CSomeClass* csc = TSingleton<CSomeClass>::Instance();
// or
// CSomeClass* csc = STSomeClass::Instance();
template<class T>
class TSingleton
{
private:
	// helper class that holds a pointer to the type
    class InstPtr
    {
    public:
        InstPtr() : m_ptr(0) {}
        ~InstPtr() { delete m_ptr; }
        T* Get() { return m_ptr; }
        void Set(T* p)
        {
            if(p!= 0)
            {
                delete m_ptr;
                m_ptr = p;
            }
        }
    private:
        T* m_ptr;
    };

	// Singleton pattern - private constructors and operator=
    static InstPtr sm_ptr;
    TSingleton();
    TSingleton(const TSingleton&);
    TSingleton& operator=(const TSingleton&);

public:
	// Get instance function
    static T* Instance()
    {
        if(sm_ptr.Get() == 0)
        {
            sm_ptr.Set(new T());
        }
        return sm_ptr.Get();
    }
};


#endif