Re: macro IS_xxx

[Paul Pogonyshev <pogonyshev gmx net>]

Andrea Zagli wrote:
> i have GObject A and GObject B; B is a A's subclass
>
> obj_a = a_new ();
> obj_b = b_new ();
>
> (a_new() and b_new() return GObject)
>
> when i call IS_OBJECT_A (obj_b) it returns TRUE: why?
>
> is it a bug? or is it normal? or am i mistaking something?

It is doing what it should.  It is like dynamic_cast in C++ or
instanceof in Java or isinstance in Python.  Although type of
obj_b is B, it is also an instance of A since B derives from A.

Paul