Re: Passing a class to a pure virtual function (without templates)

Hello there,

I have the following problem:

// abstract base class
class A {
public:
  virtual void addItems() =0;
};

class B : public A {
public:
  virtual void addItems() {
    // here I need to instantiate objects of a given type
  }
}

In B's something() function, I need to fill an internal list with
objects of a specific type. I need some way to pass my classname to
the function. Naturally I would try

template <class InstantiationClass> virtual void addItems() {
  list.push_back(new InstantiationClass());
}

Unfortunately that does not work, because pure virtual template
functions obviously don't work. Now I could move the template up to
the class B, but that is not very useful, as in my main program I will
call addItems very often and with different classes as parameters

. Is
there an easy way to do this?