c++几种常见运算符重载

理解运算符重载的含义

//路飞的代码模板
#include
using namespace std;

class A {
public:
	int x, y;
	A(int _x,int _y):x(_x),y(_y){}
	A():x(0),y(0){}

	void print(int x) {

		cout << x << " print  " << y << endl;

	}
	void print(double a) {

		cout << (double)x << "double " << (double)y << endl;
	}
	A operator+(const A& p) {
		A t(this->x, this->y);
		return A(t.x += p.x,t.y += p.y);
	}
	A& operator+=(const A& p) {
		this->x += p.x;
		this->y += p.y;
		return *this;
	}
	double operator*(const A& p) {
		return (this->x * p.x+ this->y * p.y);
	}
	A operator++(int) {
		A p(this->x, this->y);
		this->x++;
		this->y++;
		return p;
	}
	A& operator++() {
		this->x++;
		this->y++;
		return *this;
	}

	friend ostream& operator <<(ostream&, const A&);
};

ostream& operator <<(ostream& os, const A& p) {

	os << "x=   " <<(double)p.x << "  y= " << (double)p.y;
	return os;
}

int main() {
	A p2{32,12};
	A p1{1,2};
	cout <<"++p2 = " << ++p2 << endl;
	cout << "p1 + p2 = " << p1 + p2 << endl;
	cout << "p1 += p2 = " << (p1 += p2) << endl;
	cout<< "p1++ = " << p1++ << endl;
	cout << "p1 * p2 = " << p1 * p2 << endl;
	return 0;
}

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