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From: DrPi <314@drpi.fr>
Subject: Re: renames usage
Date: Fri, 1 Jan 2021 13:39:39 +0100
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Le 31/12/2020 à 19:48, Dmitry A. Kazakov a écrit :
> On 2020-12-31 16:55, DrPi wrote:
>> Le 31/12/2020 à 15:49, Jeffrey R. Carter a écrit :
>>> On 12/31/20 12:48 PM, DrPi wrote:
>>>>
>>>> Tag   : String renames Elements.Get_Tag_Name (Child);
>>>>
>>>> Is it equivalent to the following line ?
>>>>
>>>> Tag   : String := Elements.Get_Tag_Name (Child);
>>>
>>> No. A function result is a constant, so the 1st version gives you a 
>>> constant. The second gives you a variable with the same value.
>>>
>> Good to know.
>> What disturbed me was the function call associated with "renames".
> 
> Renaming a call to a function does not rename it in some 
> functional-programming manner. It renames only the result of.
> 
That's what I've understood with Jeffrey's answer.

> So if you do
> 
>     X : Float renames Random (Seed);
>     Y : array (1..10) of Float := (others => X);
> 
> That would not give you ten pseudo-random numbers. But this will:
> 
>     Z : array (1..10) of Float := (others => Random (Seed));
> 
Thanks for your detailed answer.


Reading all the answers, I understand that :
     X : Float renames Random (Seed);
is equivalent to :
     X : constant Float := Random (Seed);

Right ?