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From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Subject: Re: New Ada portable GUI Library?
Newsgroups: comp.lang.ada
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Date: Wed, 16 Jan 2008 09:47:52 +0100
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On Wed, 16 Jan 2008 18:54:03 +1100, Brian May wrote:

>>>>>> "Martin" == Martin Krischik <krischik@users.sourceforge.net> writes:
> 
>     Martin> There is just one problem here: Both Gtk+ and QT are OO libraries which
>     Martin> are not all that compatible with the Ada's OO way of live and this in
>     Martin> turn mean that layer (2) and (3) might not be as tiny as we hope for.
> 
> I am curious - in what why are they not compatible?

In Gtk+ there is a notion of class (of widgets for example). The class has
properties and signals. An instance of that class inherits them from the
class. So far so good. But this types system of Gtk+ is dynamic and weakly
typed. (You can send any parameters you want)

The incompatibility is firstly dynamic/weak Gtk+ with static/strong Ada
and, secondly, it has an implementation of its own. Less important, but
also incompatible: the messaging in Gtk+ is asynchronous in its interface
while synchronous in implementation. (The worst possible combination, BTW)
In Ada's OO messaging is all synchronous, concurrency is outside Ada's OO
model.

-- 
Regards,
Dmitry A. Kazakov
http://www.dmitry-kazakov.de