[fpc-pascal] Managed properties idea

Michalis Kamburelis michalis.kambi at gmail.com
Fri Oct 6 18:06:01 CEST 2017

05.10.2017 2:07 PM "Marcos Douglas B. Santos" <md at delfire.net> napisał(a):

On Thu, Oct 5, 2017 at 5:55 AM, Ryan Joseph <ryan at thealchemistguild.com>
>> On Oct 5, 2017, at 12:28 PM, Sven Barth via fpc-pascal <
fpc-pascal at lists.freepascal.org> wrote:
>> The way to go in Object Pascal are reference counted interfaces (aka
COM-style interfaces). After all one should program against an interface
anyway and that reference counted interfaces are automatically handled by
the compiler is an added bonus.
> example? I’ve been doing retain management manually and honestly I prefer
that for some cases where I want more control so I still like that syntax

As Sven told you, just use COM Interfaces.
Look this explanation ->
but don't pay attention when to author says "Ugly (COM) interfaces"
because it is not. :)

Really, it is not.

I hope I explained there why I consider the COM design "ugly": because it
puts three often-unrelated features (reference counting, and ability for
multiple classes to expose same API safely, and interaction with COM
technology) in one bag.

In this case, in which you indeed want two of these features
simultaneously, I advise COM interfaces myself :) That's why they are
documented after all.

In general, I would prefer these features to be available separately. Like
other languages do: interfaces in Java and C# are only to "expose same API
from multiple classes" (granted, comparison is unjust as Java and C# just
have garbage collection) -- in Pascal you get this by CORBA interfaces. And
reference counting like in e.g. C++ "shared  pointers", that can wrap any
class, without any additional feature (in Pascal we may get this with
"management operators").

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