C++ generic function pointer example / use (void*) as object pointer

 #include "stdafx.h"  
 #include <iostream>  
 #include <functional>  
 using namespace std;  
 class Point  
 {  
 public:  
      Point(double _x, double _y) :x(_x), y(_y) {};  
      double x;  
      double y;  
 };  
 typedef std::function<void*(void*)> genericFunc;  
 void * func1(void * argv) {  
      double * d = (double *)argv;  
      double x = d[0];  
      double y = d[1];  
      Point p(x, y);  
      Point* pp = &p;  
      return (void *)pp;  
 }  
 void * func2(void * argv) {  
      double * d = (double *)argv;  
      double x = d[0];  
      double y = d[1];  
      double z = d[2];  
      double R = x * y * z;  
      return (void *)&R;  
 }  
 void * TestFunc(genericFunc f, void* p)  
 {  
      return f(p);  
 }  
 int main()  
 {  
      double argv[]{ 1.2, 2.3, 3.4 };  
      Point p = * ( (Point*) TestFunc(&func1, (void*)argv) );  
      double d = *((double*)TestFunc(&func2, (void*)argv));  
      cout << "p:" << p.x << "," << p.y << ", d:" << d << endl;  
      getchar();  
   return 0;  
 }