C++ pass member function pointer as function parameter example

 #include "stdafx.h"  
 #include <vector>  
 #include <iostream>  
 #include <functional>  
 #include <vector>  
 #include <string>  
 using namespace std;  
 typedef std::function<double(int, int)> funcIntToDouble;  
 class parent;  
 class child  
 {  
 public:  
      double childValue;  
      child()  
      {  
           childValue = 10.5;  
      }  
      double InChildFunc(funcIntToDouble f, int x, int i)  
      {  
           double d = f(x, i) + childValue;  
           cout << endl << "InChildFunc: " << d << endl;  
           return d;  
      }  
 };  
 class parent  
 {  
 public:  
      int y;  
      child childObject;  
      vector<double> vec{ 1.1, 2.2, 3.3 };  
      parent()  
      {  
           y = 10.0;  
      }  
      double ParentFunc(int x, int i)  
      {  
           double d = (double)x * y + vec[i];  
           return d;  
      }  
      void CallChildObject(int parentX, int parentI)  
      {  
           funcIntToDouble f = [&](int x, int i) {  
                double d = ParentFunc(x, i);  
                return d;  
           };  
           double r = childObject.InChildFunc(f, parentX, parentI);  
           cout << endl << "CallChildObject: " << r << endl;  
      }  
 };  
 int main()  
 {  
      parent p;  
      p.CallChildObject(10, 1);  
      getchar();  
      return 0;  
 }