typedef unsigned short  USHORT;
#include <iostream.h>

class Counter
{
public:
    Counter();
    ~Counter(){}
    USHORT GetItsVal()const { return itsVal; }
    void SetItsVal(USHORT x) {itsVal = x; }
    void Increment() { ++itsVal; }
    const Counter& operator++ ();
    
private:
    USHORT itsVal;
    
};

Counter::Counter():
itsVal(0)
{};

const Counter& Counter::operator++()
{
    ++itsVal;
    cout<<this<<endl;
    
    return *this;
}

int main()
{
    Counter i;
    cout << "The value of i is " << i.GetItsVal() << endl;
    i.Increment();
    cout << "The value of i is " << i.GetItsVal() << endl;
    ++i;
    cout<<&i<<endl;
    cout << "The value of i is " << i.GetItsVal() << endl;
    Counter a=++i;
    cout<<&a<<endl;
    cout<<&i<<endl;
    a.SetItsVal(8);
    cout << "The value of a: " << a.GetItsVal();
    
    cout << " and i: " << i.GetItsVal() << endl;
    return 0;
}

我的疑问是const Counter& Counter::operator++()    Counter a=++i;返回的应该是1个常量counter对象=a,但为什么后面可以用a.SetItsVal(8);修改a自身的成员变量，还有 return *this;应该是返回i对象，但为什么a和i的内存地址不一样呢，谢谢