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 16:01:43 -0800 (PST)
Date: 2018-02-12T16:01:43-08:00 [thread overview]
Message-ID: <5f36f0ae-87ed-4482-9766-561b63b1d343@googlegroups.com> (raw)
In-Reply-To: <634e9064-33f8-42c0-9032-e630f98c89d4@googlegroups.com>
Ah !! Thanks, you made remember I could do, which works:
case GET_ELEM (T_Token_Operateur(I.all)) is
I used to think that conversion from a class-wide type to a child type need not ever be explicit, I was wrong, and it's safer that way of course.
It's better to use as little redispatching or dynamic whatever as possible. I did:
ELEMENT : Character renames STRING_VECTOR(Current_Index);
case ELEMENT is
when '(' => V_LOCAL (I) := new T_TOKEN_PARENTHESE'(La_Parenthese => '(');
when ')' => V_LOCAL (I) := new T_TOKEN_PARENTHESE'(La_Parenthese => ')');
when ';' => V_LOCAL (I) := new T_TOKEN_TERMINATEUR'(Le_Terminateur => ';');
I could do the same with '+' | '-' | '*' | '/',
but it would suck. I so want something like
when '+' | '-' | '*' | '/' => V_LOCAL (I) := new T_Token_Operateur'(L_Operateur => T_Operateur(ELEMENT));
But the conversion isn't valid, as I said. This is my last error, said the compiler. Thanks to you.
next prev parent reply other threads:[~2018-02-13 0:01 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
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 [this message]
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
replies disabled
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox