D:/Programming/GUI Editor (Source)/Singleton.h

// CSingleton.h: interface for the CSingleton class.
//

#if !defined(AFX_SINGLETON_H__A92F649D_846D_4119_B642_FA7730C464EF__INCLUDED_)
#define AFX_SINGLETON_H__A92F649D_846D_4119_B642_FA7730C464EF__INCLUDED_

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

#include <assert.h>


template<typename T>
class CSingleton
{
        static T* ms_singleton;
        public:
                CSingleton()
                {
                        assert(!ms_singleton);
                        //use a cunning trick to get the singleton pointing to the start of the whole, rather than
                        //the start of the CSingleton part of the object
                        int offset = (int)(T*)1 - (int)(CSingleton <T>*)(T*)1;
                        ms_singleton = (T*)((int)this + offset);
                }
                ~CSingleton()
                {
                        assert(ms_singleton);
                        ms_singleton = 0;
                }
                static inline T& GetSingleton()
                {
                        assert(ms_singleton);
                        return *ms_singleton;
                }

                static inline T* GetSingletonPtr()
                {
                        //assert(ms_singleton);
                        return ms_singleton;
                }
};

template <typename T> T* CSingleton <T>::ms_singleton = 0;

#endif // !defined(AFX_SINGLETON_H__A92F649D_846D_4119_B642_FA7730C464EF__INCLUDED_)

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