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: Tue, 13 Feb 2018 18:42:11 +0100
Date: 2018-02-13T18:42:11+01:00 [thread overview]
Message-ID: <p5v81j$2el$1@dont-email.me> (raw)
In-Reply-To: <982639bc-8e7e-4c43-a1ff-cf9fa7c0d0ed@googlegroups.com>
On 02/12/2018 10:18 PM, Mehdi Saada wrote:
>
> 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.
Given an object V of T_Token'Class, you can do
if V in T_Token_Operateur
and
if V in T_Token_Operateur'Class
and then do a conversion to access the components of the extension. You can also
compare V'Tag to the tags of the derived types. All of these are frowned on as
"not the type-extension way" by aficionados of type extension.
--
Jeff Carter
"If you don't get the President of the United States on that
phone, ... you're going to have to answer to the Coca-Cola
Company."
Dr. Strangelove
32
next prev parent reply other threads:[~2018-02-13 17:42 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 [this message]
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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