1 #include<string>
 2 using namespace std;
 3 //重载函数调用操作符() 
 4 //函数对象取代函数指针
 5 class Fib{
 6 private:
 7         int a0;
 8         int a1;
 9 public:
10         Fib():a0(0),a1(1){
11         //成员变量赋初值，初始化列表实现
12         }
13         Fib(int n):a0(0),a1(1){
14                 for(int i=2;i<n;i++){
15                         int ret = a1;
16                         a1 = a0 + a1;
17                         a0 = ret;
18                 }
19         }
20         //函数对象实质还是操作符重载
21         int operator()(){
22                 int ret = a1;
23                 a1=a0+a1;
24                 a0=ret;
25                 return ret;
26         }
27 };
28 int main(){
29         Fib fib1;
30 int main(){
31         Fib fib1;
32         for(int i=0;i<10;i++){
33                 //将类对象当做函数来使用，函数调用操作符()
34                 cout << fib1() << endl;
35         }
36         for(int i=0;i<5;i++){
37                 cout << fib1() << endl;
38         }
39 
40         Fib fib2;
41         for(int i=0;i<5;i++){
42                 cout << fib2() << endl;
43         }
44 
45         Fib fib3(10);
46         for(int i=0;i<5;i++){
47                 cout << fib3() <<endl;
48         }
49         return 0;
50 }