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From: Vadim Godunko <vgodunko@gmail.com>
Newsgroups: comp.lang.ada
Subject: Re: Ada requires too much typing!
Date: Thu, 10 Jun 2010 12:18:30 -0700 (PDT)
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Date: 2010-06-10T12:18:30-07:00
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On Jun 10, 2:12=A0pm, Georg Bauhaus <rm.dash-bauh...@futureapps.de>
wrote:
>
> Will it, in theory, be possible to write a Qt-like library
> in Ada such that client programs declare variables like
>
> =A0 =A0W : Some_Window'Class :=3D Some_Lib_Pack.Make (Typ =3D> Some_Id);
>
> That is, programs do not use access Some_Window'Class?

Unfortunately, not now. All you can use now is instantiation of
Qt_Ada.Generic_Object_Pointers as "container" for your object. This
package is instantiated for every subclass derived from QObject. This
generic introduces interesting idea of managing referenced object's
life cycle, stored reference is automatically resetted to null when
object is destroyed. By the way, ARG can think about such
functionality in the next standard of the language, for example by
returning back reference semantic for limited tagged types and their
classwide companions. I think that this capability can significantly
improve usage of the language outside of embedded system sector. And
as gigantic example to test new language capabilities ARG can use...
UML metamodel, it contains most kinds (and may be even all) of complex
relations between classes.