From mboxrd@z Thu Jan  1 00:00:00 1970
X-Spam-Checker-Version: SpamAssassin 4.0.1 (2024-03-25) on
	ip-172-31-91-241.ec2.internal
X-Spam-Level: 
X-Spam-Status: No, score=0.0 required=3.0 tests=none autolearn=unavailable
	autolearn_force=no version=4.0.1
Path: nntp.eternal-september.org!eternal-september.org!feeder.eternal-september.org!.POSTED!not-for-mail
From: Lawrence =?iso-8859-13?q?D=FFOliveiro?= <ldo@nz.invalid>
Newsgroups: comp.lang.ada
Subject: Re: In precision typing we trust
Date: Wed, 27 Aug 2025 00:13:06 -0000 (UTC)
Organization: A noiseless patient Spider
Message-ID: <108liii$br9n$3@dont-email.me>
References: <107uv9g$3019a$1@dont-email.me> <107v1ji$303of$1@dont-email.me>
	<336fbb5f-a279-ea8e-67fd-f62bb00d6a89@irrt.De>
	<107vfb9$34cpj$1@dont-email.me> <mgmhbtF8u6bU1@mid.individual.net>
	<10855lq$gj8l$1@dont-email.me> <1088h1a$19635$1@dont-email.me>
	<1089p1i$1ig1d$1@dont-email.me> <108aq2p$1qo9o$1@dont-email.me>
	<b7a32260-7c15-7b63-6d39-0e5e809c7201@insomnia247.nl>
	<108dh2l$2f5h3$1@dont-email.me> <108ej11$2mbr8$1@dont-email.me>
	<108g1fv$32gqg$3@dont-email.me> <108h6b7$3a75k$3@dont-email.me>
	<87plcjn5ru.fsf@nightsong.com> <108hek3$3c6u1$1@dont-email.me>
	<87ldn7mil5.fsf@nightsong.com> <108ift9$3kh0r$1@dont-email.me>
	<108ijl2$3lihe$5@dont-email.me> <108jphl$3ti12$1@dont-email.me>
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Injection-Date: Wed, 27 Aug 2025 00:13:07 +0000 (UTC)
Injection-Info: dont-email.me; posting-host="db536ba589993a61865b5d43f96eac37";
	logging-data="388407"; mail-complaints-to="abuse@eternal-september.org";	posting-account="U2FsdGVkX1+teegntTuK5PdBt61eoh5V"
User-Agent: Pan/0.163 (Kryvyi Rih)
Cancel-Lock: sha1:+uh0069oepiEoPGjVX5mcoTv1sQ=
Xref: feeder.eternal-september.org comp.lang.ada:66935
List-Id: <comp.lang.ada>

On Tue, 26 Aug 2025 09:59:48 +0200, Dmitry A. Kazakov wrote:

> On 2025-08-25 23:13, Lawrence D’Oliveiro wrote:
>>
>> On Mon, 25 Aug 2025 22:09:14 +0200, Dmitry A. Kazakov wrote:
>> 
>>> The question remains why should I need to instantiate it beyond
>>> declaring an object of?
>> 
>> Because in Python a class, like all objects, is created at runtime, not
>> compile time.
> 
> You mean type objects:

Types are objects in Python, I thought we already said that.

>> Think of a class definition, like a function definition, as just a
>> special form of assignment statement.
> 
> Both are not.
> 
>> It’s not a declaration: every time it is executed (“elaborated” if you
>> prefer the Ada term), it creates a new object.
> 
> Definition /= declaration. Executing definition creates an object, just
> like in any language.

No. In Ada, C or C++, definitions are not “executable”. They do not 
“create objects”.

Think of a function that is a class factory: each time it is called, it 
creates and returns a new class as the function result. This depends 
crucially on a) classes as first-class objects, and also b) lexical 
binding.

Can you do that in Ada, C or C++? No you cannot. You can do it in Python.

> You still did not explain what the buzz.

See my posting elsewhere about the metaclass example.