pointer to a derived class type

[michi]

Hello, I've a small problem with something like this:

I've class A and class B, where B is derived from A. In the A class I
need to have a pointer to type of class B. I need to have a pointer to
a array of objects of class B in my A class. Anyone can help?

[lilburne]

michi wrote:

Hello, I've a small problem with something like this:

I've class A and class B, where B is derived from A. In the A class I
need to have a pointer to type of class B. I need to have a pointer to
a array of objects of class B in my A class. Anyone can help?

// forward declarations
class B;
class A {
class B* b;
public:
};

[Victor Bazarov]

michi wrote:

Hello, I've a small problem with something like this:

I've class A and class B, where B is derived from A. In the A class I
need to have a pointer to type of class B. I need to have a pointer to
a array of objects of class B in my A class. Anyone can help?

class B;
class A {
B* pb;
// blah
};

class B: public A {
// bleh
};

V

[michi]

thanks lilburne, thanks Victor, you helped me a lot.

[Andrew McDonagh]

michi wrote:

Hello, I've a small problem with something like this:

I've class A and class B, where B is derived from A. In the A class I
need to have a pointer to type of class B. I need to have a pointer to
a array of objects of class B in my A class. Anyone can help?

Whilst the others have shown you how to do it...it is worth pointing out
that a base class knowing about its derived types is not a good design.

Could the A class not contain a pointer to an array of 'A's, that way,
should a new derived class 'C' come along, the array would be able to
store both B and C objects.

Andrew