重载运算符函数

1.重载[ ] 

注意：返回值类型是T，而并非类的引用

template <typename T>
T & Point<T>::operator[](int index)
{
    if(index==0) return _x;
    else return _y;
}

2.重载<<

template <typename TYPE>
ostream & operator<<(ostream &out, const Point<TYPE> &p)
{
    out << "(" << p._x << ", " << p._y << ")";
    return out;
}

3.重载>>

friend istream & operator>>(istream ⑦ &in , Complex &c)
    {
        char str[200];
        in.getline(str, 200, '(');
        in >> c.re;
        in.getline(str, 200, ',');
        in >> c.im;
        in.getline(str, 200, ')');
        return in;
    }

4.重载*（友元函数）

 friend Complex operator*(const Complex &c1, const Complex &c2)
    {
        Complex temp;
        temp.re = c1.re*c2.re - c1.im*c2.im;
        temp.im = c1.re*c2.im + c1.im*c2.re;
        return temp;
    }

5.重载 *=

 Complex & operator*=(const Complex &c)
    {
        return *this = *this * c;
    }

6.重载前++，后++

注意：前++返回引用，后++返回值

RMB & operator++()
    {
        return *this = *this + 1;
    }
RMB operator++(int)
    {
        RMB temp(*this);
        ++(*this);   //利用前++
        return temp;
    }

7.类型转换函数

operator unsigned int() const
    {      // 类型转换函数，可将RMB类型的对象转换成unsigned int类型数据
        return 100*yuan+10*jiao+fen;
    }