Using pointer to base class to call functions from derived class using another independent class

Componet-Entity-Observer-prototype.cpp

#include <iostream>
#include <vector>

using namespace std;
class Base{
public:
	Base(){}
	~Base(){}
	virtual	void Write(){
		cout<<"Base"<<endl;
	}
};


class Derived : public Base
{
public:	
	Derived(){}
	~Derived(){}
	virtual void Write(){
		cout<<"Derived"<<endl;
	}
};

class Independent{

public:
	Independent(){}
	~Independent(){}
void DoSomething(Base *  obj)
	{
		list.push_back(obj);
		for(int a=0;a<list.size();a++)
		{
			list[a]->Write();
		} 
	}
protected:

	vector<Base *> list;
};


int main()
{
	Independent i;
	Base *d  = new Derived();
	i.DoSomething(d);

return 0;
}