1 //STL函数对象 仿函数 2 #include<iostream> 3 #include<string> 4 5 using namespace std; 6 7 8 //1.函数对象在使用时,可以向普通函数那样调用,可以有参数,可以有返回值 9 class Myadd 10 { 11 public: 12 int operator()(int v1, int v2) 13 { 14 return v1 + v2; 15 } 16 }; 17 void test01() 18 { 19 Myadd myadd; 20 cout << myadd(10, 10) << endl; 21 } 22 //2.函数对象超出普通函数的概念,函数对象可以有自己的状态 23 class Myprint 24 { 25 public: 26 Myprint() 27 { 28 this->count = 0; 29 } 30 void operator()(string test) 31 { 32 cout << test << endl; 33 this->count++; 34 } 35 36 int count; ///内部自己状态 37 }; 38 void test02() 39 { 40 Myprint myprint; 41 myprint("zhenglei "); 42 myprint("zhenglei "); 43 myprint("zhenglei "); 44 myprint("zhenglei "); 45 myprint("zhenglei "); 46 47 cout << "Myprint调用的次数= " << myprint.count << endl; 48 } 49 //3函数对象可以作为参数来传递 50 void doPrint(Myprint&mp,string test) 51 { 52 mp(test); 53 } 54 void test03() 55 { 56 Myprint myPrint; 57 doPrint(myPrint, "zhenglei"); 58 } 59 60 int main() 61 { 62 test01(); 63 test02(); 64 test03(); 65 system("pause"); 66 return 0; 67 }