From: "Jeffrey R. Carter" <spam.jrcarter.not@spam.not.acm.org>
Subject: Re: troubles learning OOP: expected type "Parent.Some_Child", found type Parent'Class
Date: Mon, 12 Feb 2018 21:25:42 +0100
Date: 2018-02-12T21:25:42+01:00 [thread overview]
Message-ID: <p5st86$rg1$1@dont-email.me> (raw)
In-Reply-To: <ff42cf51-b24b-4a31-b30b-033855e84576@googlegroups.com>
On 02/12/2018 07:17 PM, Mehdi Saada wrote:
>
>> Get_Elem take T_Token'Class
> How could I do that, since it meant to RETURN a different type for each subclass !
The type-extension way might be
type Something is abstract tagged null record;
function Get_Elem (Token : in T_Token) return Something'Class is abstract;
type Operator_Something is new Something with record
Operator : T_Operateur;
end record;
overriding function Get_Elem (Token : in T_Token_Operateur) return Something'Class;
Similar extensions of Something and overridings of Get_Elem for other types in
T_Token'Class. Then Get_Elem (Token_Courant) will dispatch to the appropriate
Get_Elem.
--
Jeff Carter
"You a big nose have it."
Never Give a Sucker an Even Break
107
next prev parent reply other threads:[~2018-02-12 20:25 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 [this message]
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
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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