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Subject: Re: renames usage
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From: DrPi <314@drpi.fr>
Date: Sat, 2 Jan 2021 12:55:43 +0100
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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.