Virtual table Functions in C + +

#include <iostream>using namespace Std;class grail{public:virtual void _a () {cout<< "grail::_a ()" << Endl;} virtual void _b () {cout<< "Grail::_b ()" <<ENDL; virtual void _c () {cout<< "Grail::_c ()" <<endl;}}; int main () {typedef void (*pfun) ();//function pointer. Grail g;for (int i=0;i<3;i++) {Pfun Pfun = (pfun) * ((int *) (* (int *) (&G)) +i);p fun ();//Get the function corresponding to the table. }}

Experience: The complete virtual function of C + + Class is fixed at compile time, there is no way to dynamically increase or replace one of them during execution. So the virtual call operation can have a quick delivery result, the cost is the flexibility of the implementation period.

Virtual table Functions in C + +