[fpc-pascal] corba interfaces - is/as not working properly

[Michael Van Canneyt]

On Wed, 28 Sep 2016, Lars wrote:

> On Wed, September 28, 2016 2:24 am, Graeme Geldenhuys wrote:
>> On 2016-09-28 08:38, David Emerson wrote:
>>
>>> I'm testing out CORBA interfaces before changing all my code to use
>>> them (I would prefer not to have managed types for interfaces).
>>>
>>
>> I've been using CORBA style interfaces for years,
>
>
> Curious, where do corba interfaces come in handy ? When can you use them
> that object oriented code won't offer the same features? I'm wondering if
> maybe GoLang interfaces are so popular because of similar reasons to the
> heavily underused and infamous interfaces available in delphi/fpc for
> years.
>
> i.e. what's the basic point of using an interface compared to objects and
> inheritance and procedures? Where do they really shine?
>
> In goLang (don't mean to make this off topic) interfaces are very similar
> to VarArgs or Variants but not as evil. I mean to keep this on topic by
> asking specifically what corba interfaces should be used for?  Also do
> they work across DLL's or DSO's sort of like microsoft COM?

They do not work with COM. Basically, you should use CORBA interfaces if you
want to use interfaces, but are not interested in the reference counting
mechanism that comes implicitly with the COM interfaces.

The classes unit has an example of CORBA interfaces: the observer pattern is
implemented using CORBA interfaces.

Michael.