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Singleton.h

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#if !defined(AFX_SINGLETON_H__202E8DC7_873E_47D1_AF46_DEC9051E4BE7__INCLUDED_)
#define AFX_SINGLETON_H__202E8DC7_873E_47D1_AF46_DEC9051E4BE7__INCLUDED_

#if _MSC_VER > 1000
#pragma once
#endif // _MSC_VER > 1000

#include <cassert>

template <typename T> 
class Singleton  
{
private:
    static T* ms_Singleton;

public:
    Singleton()
    {
        assert(!ms_Singleton && "Pointer to ms_Singleton is NULL");
        int offset = (int)(T*)1 - (int)(Singleton <T>*)(T*)1;
        ms_Singleton = (T*)((int)this + offset);
    }

    ~Singleton()
    {
        assert(ms_Singleton && "Nothing to destroy");
        ms_Singleton = 0;
    }

    static T& GetSingleton()
    {
        assert(ms_Singleton && "Singleton not initialized correctly");
        return (*ms_Singleton);
    }

    static T* GetSingletonPtr()
    {
        return (ms_Singleton);
    }
};

template <typename T> 
T* Singleton <T>::ms_Singleton = 0;

#endif // !defined(AFX_SINGLETON_H__202E8DC7_873E_47D1_AF46_DEC9051E4BE7__INCLUDED_)

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