Argthtjtr

I am new to C++ and am struggling on polymorphism.
I have a project where I need to have a base class (let's say Master) and three derived class.

class Master {

public : 

   virtual void run(); 

   //Other attributes non-important for the topic

}



class Derived1 : public Master {

public:

   void run(); 

   //attributes

}



class Derived2 : public Master{

public :

   Derived2(Derived1* ptr1) {ptr = ptr1;} //there comes the cause of the problem

   void run(); 

private : 

   Derived1* ptr;

}

In my main I want to create a polymorphic list vector<Master*> poly_list;
But the problem is that this list only contains pointers on the Master class so even if it could call the right function run(); I cannot send the address of Derived1 to the constructor of Derived2.

I wanted to proceed like this :

int main

{

   vector<Master*> poly_list;

   poly_list.push_back(new Derived1());

   poly_list.push_back(new Derived2(poly_list[0])); 



   return 0

}

And when I compile the code the compiler tells me that it cannot convert type Master to Derived1 for the constructor.

Anybody has a way for this to work ? Thanks by advance.

Yes, take a pointer of Derived1 before pushing it into the list:

vector<Master*> poly_list;



Derived1 *d=new Derived1();

poly_list.push_back(d);

poly_list.push_back(new Derived2(d));

Also, please, instead of using raw pointers, please, use std::unique_ptr smart pointer, so you will not leak memory if forgetting of doing delete, just as you are doing in your example.