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From: Chris Ahlstrom <OFeem1987@teleworm.us>
Newsgroups: comp.os.linux.advocacy
Subject: Re: Why Python When There Is Perl?
Date: Wed, 10 Apr 2024 08:36:35 -0400
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Lawrence D'Oliveiro wrote this copyrighted missive and expects royalties:

> On Tue, 9 Apr 2024 08:46:03 -0400, Chris Ahlstrom wrote:
>
>> Lawrence D'Oliveiro wrote this copyrighted missive and expects
>> royalties:
>> 
>>> On Sat, 6 Apr 2024 07:59:04 -0400, Chris Ahlstrom wrote:
>>>
>>>> Lawrence D'Oliveiro wrote this copyrighted missive and expects
>>>> royalties:
>>>> 
>>>>> Until you realized it would never work, because classes are not
>>>>> objects in C++.
>>>> 
>>>> :-D     WTF you talkin', Willis? Ye nae true Scotman fallacy?
>>>
>>> You tell me: does C++ accept “true Scotsmen” among its users/features,
>>> or not?
>> 
>> C++ provides many forms of programming, including object-oriented
>> programming.
>
> But no metaclasses, like Python does.
>
> I came up with an interesting use for them, to allow convenient definition 
> of a hierarchy of exception classes representing return codes from a given 
> API. More details in the “Uses For Metaclasses” notebook in this 
> collection <https://gitlab.com/ldo/python_topics_notebooks/>.

Interesting. It is not clear to me why you need metaclasses to implement the
example, though.

On another note, C++20 introduces the concept of "concepts", which put
constraints on templates and their parameters. The constraints are based on
concepts like you'd find at cppreference.com:

    std::map meets the requirements of Container, AllocatorAwareContainer,
    AssociativeContainer and ReversibleContainer. 

The full list is here:

    https://en.cppreference.com/w/cpp/concepts

Well, not the full list:

    Additional concepts can be found in the iterators library, the algorithms
    library, and the ranges library. 

These programming languages arms races are fun!

-- 
Time to be aggressive.  Go after a tattooed Virgo.