自定义类如何实现索引功能？

[CaiBirdy]

#define PROPERTY(T,X) __declspec(property(get= Get##X,put= Set##X))T X

#define READONLY_PROPERTY(T,X) __declspec(property(get= Get##X))T X //只读属性

#define SETPROP(T,X) __declspec(property(put= Set##X))T X //只写属必

#define GET(T,X) T Get##X(void)

#define SET(T,X) void Set##X(T value)

typedef struct _TagStringData{
	int iRefCount;
	int iSize;
	char* sData;
}TStringData, * PStringData;

class string
{
private:
	PStringData FMemory;
	//int FRefCount;
	int FCapacity;
	int FLength;
	wchar_t* FBufW;
	void Grow(); 
	//void Decrease();
	GET(int,Capacity); 
	SET(int,Capacity);
public:
	string(); 
	string(const char s[]);
	string(HWND Hwnd);
	~string();
	string operator + (const char s[]);
	string operator + (char* s);
	string operator + (char c); 
	string operator + (string s);
	string operator = (const string * s);
	string operator = (string s);
	string operator = (char * s);
	string operator = (const char s[]);
public:
	PROPERTY(int, Capacity);
	PROPERTY(int, Length);
	#ifdef UNICODE
		READONLY_PROPERTY(wchar_t*, buffer);
		GET(wchar_t*,buffer);
	#else
		READONLY_PROPERTY(char*, buffer);
		GET(char*,buffer);
	#endif
	READONLY_PROPERTY(char*, bufferA);
	READONLY_PROPERTY(wchar_t*, bufferW);
	GET(char*,bufferA);
	GET(wchar_t*,bufferW);
	GET(int,Length); 
	SET(int,Length);
};

请教大神，这个类如何实现下面功能，

string sTmp = "123123";

char C = sTmp[1];

最后得到 C 等于 '1'

[CaiBirdy]

查到了，貌似重载运算符[]模拟索引器，返回值类型为type &，即可实现get和set的效果，
如下：
char & operator [](int iIndex);

测试貌似可以，结贴

[傻X]

操作符重载的基本概念。

[oyljerry]

实现operator []