Member selectors in C + +

In C + +, pointers that can only point to class members can be used to extract data from this type of pointer, using the following two types of operators: the member object selection operator. * and member pointer selection operator->*

Example:

#include <iostream>using namespace std;struct c{    int x;    float y;    float Z;}; int main () {    float F;    int* i_ptr;    C C1, C2;    Float C::* f_ptr; A pointer to a float member of C    f_ptr = &C::y;  Point to C member y    c1.*f_ptr = 3.14;//Set c1.y = 3.14    c2.*f_ptr = 2.01;//Set c2.y = 2.01    f_ptr = &am P C::z;  Point to C member Z    c1.*f_ptr = -9999.99,//set c1.z = -9999.99    f_ptr = &C::y;//point to c member y
  
   c1.*f_ptr =-777.77; Set c1.y    f_ptr = &C::x;//****error:x is not float****    f_ptr = &f;//****error:f are not a float m Ember of c****    i_ptr = &c1.x;//c1.x is an int    //...    return 0;}
  

　　

Member selectors in C + +