Re: renames usage

["Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>]

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.

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));

-- 
Regards,
Dmitry A. Kazakov
http://www.dmitry-kazakov.de