重载运算符是函数重载的一种,
针对类对象进行操作,重载的函数中至少有一个是类对象
int operator +(ass numone, int num){...}
重载为类的成员函数,
单目运算符重载-操作数是访问本身的数据,由this指出
双目运算符重载-左操作数由this指针给出,右操作数由函数参数给出
显示调用-aa.operator(bb);
隐式调用-aa++bb;
重载为友元函数,
单目重载运算符时,由于要改变操作数自身的值,应采用引用参数传递
class point{private:int num;public:point(){num = 0;}point(int n){num = n;}point operator +(point mn);point operator ++();friend point operator -(point m, point n);friend point operator --(point &m);int get_num();};int point::get_num(){return num;}point point::operator +(point mn){point item;item = num + mn.num;return item;}point point::operator ++(){++num;return *this;}point operator -(point m, point n){point temp;temp.num = m.num + n.num;return temp;}point operator --(point &m){--m.num;return m;}
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