class a{
public:
void (*draw)();
}
class b{
public:
void draw();
}
init(){
...
a A;
b B;
A.draw = B.draw;
polymorphism problem
Author
I'm getting a wierd problem that I can't seem to find a way around. Can someone explain this to me?
Why don't you use a more common way of implemting polymorphism.. virtual functions?
Sure, it implies one extra dereffering, but you wouldn't use it in performance critical parts anyway..
Here's an example:
Notes: try to save few whitespaces here and there.. struct instead of classes (default public members), and function decleration inside class decleration
btw, how do you keep the linebreaks in the code?
[edited by - BiTwhise on January 17, 2004 6:58:54 PM]
Sure, it implies one extra dereffering, but you wouldn't use it in performance critical parts anyway..
Here's an example:
#include <iostream>using namespace std;struct Person { virtual void hi() { cout << "hi, I'm a person" << endl; }};struct Man : public Person { virtual void hi() { cout << "hi, I'm a man" << endl; }};struct Woman : public Person { virtual void hi() { cout << "hi, I'm a woman" << endl; }};int main(){ Person* people[3]; people[0] = new Person; people[1] = new Man; people[2] = new Woman; for( int i=0; i<3; i++ ) people[i]->hi(); for( i=0; i<3; i++ ) delete people[i]; return 0;} Notes: try to save few whitespaces here and there.. struct instead of classes (default public members), and function decleration inside class decleration
btw, how do you keep the linebreaks in the code?
[edited by - BiTwhise on January 17, 2004 6:58:54 PM]
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