#ifndef _CSINGLETON_H_
#define _CSINGLETON_H_

#include <cassert>

template<typename Derived>
class CSingleton
{
private:

	static Derived* ms_pSingleton;

protected:

	CSingleton();
	~CSingleton();

public:

	inline static Derived& GetInstance();
	inline static Derived* GetInstancePtr();
};


template<typename Derived>
CSingleton<Derived>::CSingleton()
{
	assert(!ms_pSingleton && "Singleton Ŭ·¡½º°¡ ÀÌ¹Ì »ý¼ºµÇ¾î ÀÖ½À´Ï´Ù.");
	size_t nOffset = (size_t)(Derived*) 1 - (size_t)(CSingleton<Derived>*)(Derived*) 1;
	ms_pSingleton = (Derived*)((size_t)this + nOffset);
}


template<typename Derived>
CSingleton<Derived>::~CSingleton() 
{
	assert(ms_pSingleton && "Singleton Ŭ·¡½º°¡ »ý¼ºµÇÁö ¾Ê¾Ò½À´Ï´Ù");
    ms_pSingleton = 0;
}

template<typename Derived>
inline Derived& CSingleton<Derived>::GetInstance() 
{
	assert(ms_pSingleton && "Singleton Ŭ·¡½º°¡ »ý¼ºµÇÁö ¾Ê¾Ò½À´Ï´Ù");
    return (*ms_pSingleton);
}

template<typename Derived>
inline Derived* CSingleton<Derived>::GetInstancePtr()
{
	assert(ms_pSingleton && "Singleton Ŭ·¡½º°¡ »ý¼ºµÇÁö ¾Ê¾Ò½À´Ï´Ù");
    return (ms_pSingleton);
}

template<typename Derived>
Derived* CSingleton<Derived>::ms_pSingleton = 0;

#endif