C / C++ / MFC

class AFX_EXT_CLASS FIFO  
{
public:
	enum tagBUFFER_STATUS{ FREE = 0x00, BUSY = 0x01 };
	struct tagARRAY {
		int _buf;
		tagBUFFER_STATUS _sts;
	};
	DWORD In(int& value);
	DWORD Out(int& value);

	FIFO();
	virtual ~FIFO();

private:
	 tagARRAY _array[10];
	 int _itr;
	 int _itw;
};

template<class T, int Size>
class AFX_EXT_CLASS FIFO  
{
public:
	enum tagBUFFER_STATUS{ FREE = 0x00, BUSY = 0x01 };
	struct tagARRAY {
		int _buf;
		tagBUFFER_STATUS _sts;
	};
	DWORD In(T& value);
	DWORD Out(T& value);

	FIFO();
	virtual ~FIFO();

private:
	 tagARRAY _array[Size];
	 int _itr;
	 int _itw;
};