[fpc-pascal] IS operator and library created objects

Sven Barth pascaldragon at googlemail.com
Thu Aug 20 08:06:40 CEST 2015

Am 20.08.2015 03:42 schrieb "Fabio Luis Girardi" <fluisgirardi at gmail.com>:
> Currently, I'm doing a small program that uses libraries, objects and the
operator IS, that is know that this operator fails because of duplication
of VMT.

And /that/ is one of the reasons why dynamic packages were invented...

> Everyone know some alternative (or more elegant) method to test if a
object created on a library is a class descendant without use
object.ClassName? Or in case of use String to check the class name, how
retrieve the class name of all descendant classes from a object?

Nope, there is no more elegant way. And you'll probably need to walk the
class tree using ParentClass and retrieve each name.

Note: an except-handler will suffer from the same problem if it needs to
catch an exception that was raised from the library (or the other way
You are going to a extreme fragile direction there.

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.freepascal.org/pipermail/fpc-pascal/attachments/20150820/3b87dc50/attachment.html>

More information about the fpc-pascal mailing list