<< 链式重载

 1 #include <iostream>
 2 
 3 using namespace std;
 4 
 5 class Complex
 6 {
 7 private:
 8     int a, b;
 9 public:
10     Complex(int a, int b) :a(a), b(b)
11     {}
12     friend ostream& operator<<(ostream &out, Complex &c);
13 
14     void operator+(Complex &c)          //放在类里
15     {
16           this->a = this->a + c.a;
17           this->b = this->b + c.b;
18           //return *this;
19     }
20 
21 };
22 
23 ostream& operator<<(ostream &out, Complex &c)
24 {
25     out << "a = " << c.a << "  b = " << c.b;
26     return out;
27 }
28 
29 int main()
30 {
31     Complex c1(1, 2), c2(3, 4);
32 
33     cout << c1 << "showmethemoney" << "aaaaa" << c1 << endl;
34     //输出c1之后,返回cout(重载函数中手工返回),接着输出两个字符串(系统本身功能),再次返回cout(系统函数所定义的返回),最后又输出c1(重载函数功能),返回cout,最后endl;
35     system("pause");
36     return 0;
37 }