From: Simon Wright <simon@pushface.org>
Subject: Re: grassroots thoughts on access types
Date: Fri, 09 Feb 2018 09:13:52 +0000
Date: 2018-02-09T09:13:52+00:00 [thread overview]
Message-ID: <lyr2pumsof.fsf@pushface.org> (raw)
In-Reply-To: p5it73$psq$1@franka.jacob-sparre.dk
"Randy Brukardt" <randy@rrsoftware.com> writes:
> Generally, type conversions for general access types are equivalent to
> ".all'Access".
.all'Access leaves it up to the compiler to figure out the conversion.
A colleague (one of the distinguished reviewers for Ada95) said (~2000)
he'd got into the habit of writing .all'Access, when usually (? - maybe
compiler issues) some thought would lead to the actual required
conversion.
>> Instead of
>> function Set_Ptr (Elem : in T_Operateur) return T_Ptr_Token is
>> Ptr_Token : T_Ptr_Token_Operateur;
>> can we write:
>> function Set_Ptr (Elem : in T_Operateur) return T_Ptr_Token is
>> Ptr_Token : T_Ptr_Token;
>> ? What's the difference regards to implementation, memory usage or
>> anything ?
>> T_TOKEN is a null tagged record type, T_TOKEN_OPERATEUR has one more
>> enumerative component.
>
> No difference that I can see. T_Ptr_Token_Operateur seems like a
> totally unnecessary type to me, since the allocator would work just as
> well with T_Ptr_Token. (But I haven't tried this in an actual
> compiler, so I might have forgotten something subtle.)
We don't know the spec of Initialisation, but you might have to write
Initialisation(T_Token_Operateur(Ptr_Token.all),Elem);
next prev parent reply other threads:[~2018-02-09 9:13 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-02-09 0:46 grassroots thoughts on access types Mehdi Saada
2018-02-09 1:23 ` Randy Brukardt
2018-02-09 9:13 ` Simon Wright [this message]
2018-02-09 11:06 ` Dmitry A. Kazakov
2018-02-09 12:09 ` Mehdi Saada
2018-02-09 12:11 ` Mehdi Saada
2018-02-09 14:23 ` Simon Wright
2018-02-09 16:11 ` Mehdi Saada
2018-02-09 17:01 ` Jeffrey R. Carter
2018-02-09 17:19 ` Dmitry A. Kazakov
2018-02-09 19:12 ` Jeffrey R. Carter
2018-02-09 20:17 ` Robert A Duff
2018-02-09 21:44 ` Jeffrey R. Carter
2018-02-09 22:06 ` Dmitry A. Kazakov
2018-02-10 0:43 ` Mehdi Saada
2018-02-10 1:51 ` Mehdi Saada
2018-02-10 10:07 ` Jeffrey R. Carter
2018-02-10 11:57 ` Mehdi Saada
2018-02-10 14:02 ` Simon Wright
2018-02-10 15:32 ` Jeffrey R. Carter
2018-02-10 16:46 ` Mehdi Saada
2018-02-10 8:28 ` Dmitry A. Kazakov
2018-02-10 11:55 ` Mehdi Saada
2018-02-10 14:35 ` Dmitry A. Kazakov
2018-02-10 16:51 ` Simon Wright
2018-02-10 17:19 ` Dmitry A. Kazakov
2018-02-10 10:03 ` Jeffrey R. Carter
2018-02-10 10:36 ` Dmitry A. Kazakov
2018-02-10 11:12 ` Jeffrey R. Carter
2018-02-10 14:44 ` Dmitry A. Kazakov
2018-02-10 21:16 ` Robert A Duff
2018-02-11 10:47 ` Jeffrey R. Carter
2018-02-11 21:51 ` Robert A Duff
2018-02-09 20:58 ` Shark8
2018-02-09 20:32 ` G. B.
2018-02-09 20:53 ` Mehdi Saada
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