From: Mehdi Saada <00120260a@gmail.com>
Subject: Re: troubles learning OOP: expected type "Parent.Some_Child", found type Parent'Class
Date: Mon, 12 Feb 2018 13:19:10 -0800 (PST)
Date: 2018-02-12T13:19:10-08:00 [thread overview]
Message-ID: <43fd90b9-aa93-49b7-9ea2-95da53983d41@googlegroups.com> (raw)
In-Reply-To: <p5st86$rg1$1@dont-email.me>
the components are all enumeration types of one character, except for T_TOKEN_OPERANDE.OPERANDE who's an INTEGER.
Ahhh... The trick is to encapsulate the components of different types into tagged types, so that they can be grouped together into a class, and so GET_ELEM can be dispatched. That's awfully artifical. Unfortunately, I must keep with the current design,
with things like
type T_TOKEN is abstract tagged null record;
type T_TOKEN_OPERANDE is new T_TOKEN with record
OPERANDE: INTEGER;
end record;
Besides, I still would need to access the actual inner component of Something, not only OPERANDE_SOMETHING. Even I'm wrong I can't apply that anyway.
I can't believe T_TOKEN'class is as useless... well, in a sense, since the program doesn't know the actual type of TOKEN but only that it's a child of T_TOKEN, no wonder there's some limitations. But I'm surprised there's no mechanism in the language, to tell the program: HEY there ! I'm sure it's T_TOKEN_OPERANDE, so now consider TOKEN as such and let me reach it's OPERANDE component.
next prev parent reply other threads:[~2018-02-12 21:19 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-02-12 16:29 troubles learning OOP: expected type "Parent.Some_Child", found type Parent'Class Mehdi Saada
2018-02-12 17:44 ` Jeffrey R. Carter
2018-02-12 18:17 ` Mehdi Saada
2018-02-12 18:24 ` Dmitry A. Kazakov
2018-02-12 18:42 ` Simon Wright
2018-02-12 20:25 ` Jeffrey R. Carter
2018-02-12 21:18 ` Mehdi Saada
2018-02-12 22:40 ` Simon Wright
2018-02-12 23:12 ` Mehdi Saada
2018-02-13 8:00 ` Stephen Leake
2018-02-13 17:42 ` Jeffrey R. Carter
2018-02-13 17:56 ` Dmitry A. Kazakov
2018-02-12 21:19 ` Mehdi Saada [this message]
2018-02-12 18:40 ` Simon Wright
2018-02-12 21:39 ` Mehdi Saada
2018-02-12 21:43 ` Mehdi Saada
2018-02-12 22:22 ` Mehdi Saada
2018-02-13 17:46 ` Jeffrey R. Carter
2018-02-13 20:19 ` Mehdi Saada
2018-02-13 21:24 ` Bojan Bozovic
2018-02-13 23:03 ` Mehdi Saada
2018-02-13 23:03 ` Mehdi Saada
2018-02-14 7:00 ` Bojan Bozovic
2018-02-14 12:04 ` Mehdi Saada
2018-02-16 23:40 ` Mehdi Saada
2018-02-17 1:13 ` Mehdi Saada
2018-02-13 0:01 ` Mehdi Saada
2018-02-13 0:42 ` Mehdi Saada
2018-02-13 1:32 ` Mehdi Saada
2018-02-13 4:16 ` Bojan Bozovic
2018-02-13 11:28 ` Simon Wright
2018-02-13 12:03 ` Mehdi Saada
2018-02-13 13:25 ` Dmitry A. Kazakov
2018-02-19 18:10 ` Mehdi Saada
2018-02-19 18:16 ` Simon Clubley
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