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From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Newsgroups: comp.lang.ada
Subject: Re: Calling inherited primitive operations in Ada
Date: Sat, 3 Sep 2022 10:23:01 +0200
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On 2022-09-03 02:12, Randy Brukardt wrote:
> "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de> wrote in message
> news:teso01$16gg$1@gioia.aioe.org...
>> On 2022-09-02 12:41, Jeffrey R.Carter wrote:
>>
>>> The only indefinite data structure that is needed seems to be holders.
>>
>> The language should support and encourage design that does not rely on
>> memory pools.
>>
>> In my view one of major advantages of Ada is that indefinite objects can
>> be handled without resorting to hidden or explicit pointers to pools.
> 
> But they're implemented with some sort of hidden allocation. (GNAT uses a
> "secondary stack", whatever that is, but that is just a restricted form of
> pool). Janus/Ada uses built-in pools with cleanup for all such things to
> simplify the interface (the code for allocations and stand-alone objects is
> mostly shared, both within the compiler and at runtime).

For a programmer that does not matter. The problem with pools is 
locking, non-determinism, issues with protected actions. If secondary or 
primary stack is the program stack, nobody really cares.

BTW, merely doing pool tracing/bookkeeping becomes a sheer nightmare if 
you cannot return a string from a function.

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