overriding function not worked

Asked Mar 31 '20 at 19:57

Active Mar 31 '20 at 20:01

Viewed 46 times

I have a base and derived class which derived class is overriding a function in base class

struct Base{
virtual void action(){}
}

struct Derived:public Base{
virtual void action() override{}
}

I have another class that uses Base interface like following

struct Observable{
  deque<Base> myObjects;

  void addObject(Base &base){
     myObjects.push_back(base);
  }
  void notify(){
     for (auto it = myObjects.begin(); it != myObjects.end(); it++) {
            it.action();
     }
  }
}

In main I initialized observer class like this

Derived myDeived;
Observable observable;
observable.addObject(myDerived);
observable.notify();

the problem when I call "notify" and as a consequence it call all "action" function in array It does not call "action" function overrided in Derived but in Base class? please explain me why this happened and how to correct it? Thank you

asked Mar 31 '20 at 19:57

Ahmad Banshee

2

Does this answer your question? [Does polymorphism work in C++ without pointers / references?](https://stackoverflow.com/questions/11670936/does-polymorphism-work-in-c-without-pointers-references) – Spinkoo Mar 31 '20 at 20:00
`deque` is a deque of `Base` *object*. For polymorphism and virtual functions to work you need to have *pointers* to the base type (or references). – Some programmer dude Mar 31 '20 at 20:01
@Spinkoo thank you for great answer – Ahmad Banshee Mar 31 '20 at 20:10
@Someprogrammerdude thank you too – Ahmad Banshee Mar 31 '20 at 20:12

overriding function not worked

0 Answers0