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c++classobjectmethods

Is Overriding Methods From An Object Possible? C++

I was wondering if it is possible to override a method of an object ex:

class Object{
public:
  void Foo(){
  //do something
  }
};

Object* obj = new Object();

obj->Foo() {
//do something else
}

I tried to use a function variable but it still does not work.

Please some help, I feel like I am about to lose my braincells over this problem.

Solution

  • As mentioned by @Jarod42 in the comments I would add a std::function member, or some other callable. As an example (Godbolt)

    #include <functional>
#include <iostream>
#include <utility>

class Object {
public:
   Object(std::function<int(int)> do_work) : do_work_(std::move(do_work)) {}

   int DoWork(int i) { return do_work_(i); }

private:
   std::function<int(int)> do_work_;
};

int main() {
  Object obj1{[](int i){ return i + 1;}};
  std::cout << obj1.DoWork(1) << '\n';

  Object obj2{[](int i){ return i - 1;}};
  std::cout << obj2.DoWork(1) << '\n';
}

    You can see that DoWork invokes the callable, and each instance of the Object class is free to define what that work is.