From: DrPi <314@drpi.fr>
Subject: Re: renames usage
Date: Sat, 2 Jan 2021 12:55:43 +0100 [thread overview]
Message-ID: <5ff05f40$0$16182$426a74cc@news.free.fr> (raw)
In-Reply-To: <rsnckg$h6v$1@dont-email.me>
Le 01/01/2021 à 15:46, Jeffrey R. Carter a écrit :
> On 1/1/21 1:39 PM, DrPi wrote:
>>
>> Reading all the answers, I understand that :
>> X : Float renames Random (Seed);
>> is equivalent to :
>> X : constant Float := Random (Seed);
>
> Technically, the renames gives a name to the anonymous temporary object
> returned by the function. The constant declaration makes a constant copy
> of it. So they're equivalent, but not identical.
>
> However, the compiler is free to optimize the copy away, and I'd be
> surprised if there are any compilers that don't (except GNAT with -O0).
>
Effectively, the copy can be of importance in some situations.
Thanks.
next prev parent reply other threads:[~2021-01-02 11:55 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-12-31 11:48 renames usage DrPi
2020-12-31 12:10 ` John Perry
2020-12-31 13:31 ` DrPi
2020-12-31 12:33 ` Gautier write-only address
2020-12-31 14:49 ` Jeffrey R. Carter
2020-12-31 15:55 ` DrPi
2020-12-31 18:48 ` Dmitry A. Kazakov
2021-01-01 12:39 ` DrPi
2021-01-01 13:20 ` Dmitry A. Kazakov
2021-01-02 11:53 ` DrPi
2021-01-01 14:46 ` Jeffrey R. Carter
2021-01-02 11:55 ` DrPi [this message]
2021-01-03 3:19 ` Randy Brukardt
2021-01-03 10:05 ` Jeffrey R. Carter
2021-01-06 2:49 ` Randy Brukardt
2021-01-02 16:00 ` G.B.
2021-01-02 17:22 ` Simon Wright
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