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From: "Randy Brukardt" <randy@rrsoftware.com>
Newsgroups: comp.lang.ada
Subject: Re: Ada Pure or Preelaborate or ? in Adare_net
Date: Wed, 5 Jan 2022 17:40:04 -0600
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"Daniel Norte Moraes" <danielcheagle@gmail.com> wrote in message 
news:378bc69a-8388-4daf-b13f-523fd1defa12n@googlegroups.com...
>Em terça-feira, 4 de janeiro de 2022 às 10:52:42 UTC-3, Fabien Chouteau 
>escreveu:
>> On Friday, December 31, 2021 at 5:13:33 PM UTC+1, daniel...@gmail.com 
>> wrote:
>> > For this reason, if really 'is' pure, not pure, preelaborate or what 
>> > (?), pleeeeeeaaase, we ask the group's Ada Language Lawyers to help 
>> > analyze and suggest modifications if necessary.
>> I recommend reading this: 
>> https://stackoverflow.com/questions/19353228/when-to-use-pragma-pure-preelaborate
>>
>> If your units are declared as Pure, the compiler considers that they have 
>> no side effect and can decided to call the sub-programs only once and 
>> cache the result, or not even call the sub-program if the result is not 
>> used after.

>Thanks!
>I read the post and believe that because most variables are either streamed 
>or aliased and imported, lib works as it should.
>However, there is still the possible problem of omitting the same 
>subprograms with the same parameters (by compiler), although in the tests 
>this did not happen, would replacing aspect 'pure' by 'preelaborate' solve 
>this possible problem?

Yes. The permission to omit calls only applies to Pure (see 10.2.1(18/3)). 
http://www.ada-auth.org/standards/2xaarm/html/AA-10-2-1.html#p18. (I gave a 
reference to the Ada 2022 AARM, but this rule hasn't changed in spirit since 
it was introduced in Ada 95.)

                        Randy.