[fpc-pascal] Find the nature of a pointer

[Mattias Gaertner]

On Fri, 1 Sep 2006 20:08:30 +0200 (CEST)
marcov at stack.nl (Marco van de Voort) wrote:

> > I have a function that will receive a Handle. That handle could be a
> > pointer to a structure, or a object. Is there any safe way to
> > discover it's nature?
> 
> No you can't. 
> 
> > The following code will work when the Handle is an Object or nil,
> > but will crash the application when the Handle is a structure:
> 
> It is not even 100% save for that, some systems use other values
> instead of nil/0. 

For example?

Mattias