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From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Newsgroups: comp.lang.ada
Subject: Re: GtkAda. Printing
Date: Wed, 3 Aug 2016 12:55:25 +0200
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Date: 2016-08-03T12:55:25+02:00
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On 2016-08-03 12:25, ldries46 wrote:
> Yes Print is declared as Gtkada_Print_Operation; and still in the Call
> to routine Set_N_Pages(Print_Op, 1); the compiler does not find an error
> while the declaration is
>
> procedure Set_N_Pages
>   (Self    : not null access Gtk_Print_Operation_Record;
>    N_Pages : Gint);
>
> and
>
> type Gtkada_Print_Operation_Record is new
>  Gtk_Print_Operation_Record with private;
> type Gtkada_Print_Operation is access all Gtkada_Print_Operation_Record;
>
> I expect that in the compiler to react the same in simular cases.
> Therefore I think that the error in lines 190:30 is the real error and
> the one I asked about.

That depends on whether the operation is primitive or type specific. A 
primitive operation is inherited. Draw_Page parameter types are

    access Gtk_Print_Operation_Record'Class;
    not null access Gtk_Context_Record'Class;
    Gint

not

    Gtk_Print_Operation_Record;
    Gtk_Print_Context;
    Gint

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