1 类成员函数的指针
2 类成员函数的指针数组
3 指向类成员函数的指针的指针
1 类成员函数的指针
auto func1 = &com::jia;//C++函数指针
int (com::*p)(int, int) = &com::jia;//C函数指针
1 #include <iostream> 2 3 class com 4 { 5 private: 6 int a; 7 int b; 8 public: 9 com(int x, int y) :a(x), b(y) 10 { 11 12 } 13 int jia(int a, int b) 14 { 15 return a + b; 16 } 17 int jian(int a, int b) 18 { 19 return a - b; 20 } 21 int cheng(int a, int b) 22 { 23 return a*b; 24 } 25 double chu(int a, int b) 26 { 27 return a / b; 28 } 29 }; 30 31 void main() 32 { 33 com com1(100, 20); 34 35 auto func1 = &com::jia;//C++函数指针 36 int (com::*p)(int, int) = &com::jia;//C函数指针 37 38 std::cout << typeid(func1).name() << std::endl;//打印数据类型，上下一样 39 std::cout << typeid(p).name() << std::endl;//打印数据类型，上下一样 40 41 system("pause"); 42 }
2 类成员函数的指针数组
typedef int(com::*P)(int, int);
P func1[4] = { &com::jia ,&com::jian,&com::cheng,&com::chu };//使用typedef
int(com::*func2[4])(int, int) = { &com::jia ,&com::jian,&com::cheng,&com::chu };//不使用typedef
1 #include <iostream> 2 3 class com 4 { 5 private: 6 int a; 7 int b; 8 public: 9 com(int x, int y) :a(x), b(y) 10 { 11 12 } 13 int jia(int a, int b) 14 { 15 return a + b; 16 } 17 int jian(int a, int b) 18 { 19 return a - b; 20 } 21 int cheng(int a, int b) 22 { 23 return a*b; 24 } 25 int chu(int a, int b) 26 { 27 return a / b; 28 } 29 }; 30 31 typedef int(com::*P)(int, int); 32 33 void main() 34 { 35 com com1(100, 20); 36 37 P func1[4] = { &com::jia ,&com::jian,&com::cheng,&com::chu };//使用typedef 38 39 int(com::*func2[4])(int, int) = { &com::jia ,&com::jian,&com::cheng,&com::chu };//不使用typedef 40 41 for (int i = 0; i < 4; i++) 42 { 43 std::cout << (com1.*func1[i])(10, 20) << std::endl; 44 std::cout << (com1.*func2[i])(10, 20) << std::endl; 45 std::cout << std::endl; 46 } 47 48 system("pause"); 49 }
3 指向类成员函数的指针的指针
1 #include <iostream> 2 3 class com 4 { 5 private: 6 int a; 7 int b; 8 public: 9 com(int x, int y) :a(x), b(y) 10 { 11 12 } 13 int jia(int a, int b) 14 { 15 return a + b; 16 } 17 int jian(int a, int b) 18 { 19 return a - b; 20 } 21 int cheng(int a, int b) 22 { 23 return a*b; 24 } 25 int chu(int a, int b) 26 { 27 return a / b; 28 } 29 }; 30 31 typedef int(com::*P)(int, int); 32 33 void main() 34 { 35 com com1(100, 20); 36 37 P func1[4] = { &com::jia ,&com::jian,&com::cheng,&com::chu };//使用typedef 38 39 int(com::*func2[4])(int, int) = { &com::jia ,&com::jian,&com::cheng,&com::chu };//不使用typedef 40 41 int(com::**funcp)(int, int) = func1;//二级指针，指向类成员函数的指针的指针 42 43 for (; funcp < func1 + 4; funcp++)//指针遍历数组 44 { 45 std::cout << (com1.**funcp)(10, 20) << std::endl; 46 } 47 48 system("pause"); 49 }