#include<iostream>
using namespace std;
class Complex
{
friend Complex operator+(Complex &c1, Complex &c2);
friend ostream& operator<<(ostream &out, Complex &c1);
private:
int a;
int b;
public:
Complex(int a = 0, int b = 0)
{
this->a = a;
this->b = b;
}
void printCom()
{
cout << a << "+" << b << "i" << endl;
}
//成员函数 法 实现 - 运算符重载
Complex operator-(Complex &c2)
{
Complex tmp(this->a - c2.a, this->b - c2.b);
return tmp;
}
};
/*
void operator<<(ostream &out, Complex &c1)
{
out << c1.a << "+" << c1.b << "i" << endl;
}
*/
ostream & operator<<(ostream &out, Complex &c1)
{
out << c1.a << "+" << c1.b <<"i"<< endl;
return out;
}
int main()
{
int a = 10;
Complex c1(1, 2), c2(3,4);
cout << a << endl; //按照数据类型
//1
cout << c1;
//2 函数返回值当左值 需要返回一个引用
//cout.operator (c1);
//应该在cout类中,添加 成员函数 .operator<<
//结论:输入输出流的重载只能使用友元函数的方法,不能使用成员函数的方法
//3 连体输出
cout << c1 << "aadddd";
//cout.operator(c1).operator<<("aadddd");
//void .operator<<("aadddd"); 左操作数为void
//
return 0;
}
P213_友元函数实现左移右移操作符重载
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转载自blog.csdn.net/weixin_41983807/article/details/87825336
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