Re: C++, Ada, ...

From	David Brown <david.brown@hesbynett.no>
Newsgroups	comp.arch.embedded
Subject	Re: C++, Ada, ...
Date	2021-04-18 22:17 +0200
Organization	A noiseless patient Spider
Message-ID	<s5i441$tro$1@dont-email.me> (permalink)
References	(2 earlier) <ie260rFghneU1@mid.individual.net> <s5hafg$g1$1@dont-email.me> <ie34olFmda9U1@mid.individual.net> <s5hq48$k2e$1@dont-email.me> <WU_eI.237389$KHwf.63256@fx25.ams4>

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On 18/04/2021 20:30, Tom Gardner wrote:
> On 18/04/21 18:26, David Brown wrote:
>> C++ has got a lot stronger at compile-time work in recent versions.  Not
>> only have templates got more powerful, but we've got "concepts" (named
>> sets of features or requirements for types), constexpr functions (that
>> can be evaluated at compile time or runtime), consteval functions (that
>> must be evaluated at compile time), constinit data (that must have
>> compile-time constant initialisers), etc.  And constants determined at
>> compile-time are not restricted to scaler or simple types.
> 
> Sounds wordy ;)

Have you looked at the C++ standards documents?  There are more than a
few words there!

I'm not suggesting C++ is a perfect language - not by a long way.  It
has plenty of ugliness, and in this thread we've covered several points
where Ada can do something neater and clearer than you can do it in C++.

But it's a good thing that it has more ways for handling things at
compile time.  In many of my C projects, I have had Python code for
pre-processing, for computing tables, and that kind of thing.  With
modern C++, these are no longer needed.

An odd thing about the compile-time calculation features of C++ is that
they came about partly by accident, or unforeseen side-effects.  Someone
discovered that templates with integer parameters could be used to do
quite a lot of compile-time calculations.  The code was /really/ ugly,
slow to compile, limited in scope.  But people were finding use for it.
 So the motivation for "constexpr" was that programmers were already
doing compile-time calculations, and so it was best to let them do it in
a nicer way.

Thread

C++, Ada, ... pozz <pozzugno@gmail.com> - 2021-04-17 17:48 +0200
  Re: C++, Ada, ... David Brown <david.brown@hesbynett.no> - 2021-04-17 18:45 +0200
    Re: C++, Ada, ... Tom Gardner <spamjunk@blueyonder.co.uk> - 2021-04-17 19:55 +0100
      Re: C++, Ada, ... David Brown <david.brown@hesbynett.no> - 2021-04-18 12:53 +0200
        Re: C++, Ada, ... Niklas Holsti <niklas.holsti@tidorum.invalid> - 2021-04-18 18:48 +0300
          Re: C++, Ada, ... David Brown <david.brown@hesbynett.no> - 2021-04-18 18:59 +0200
            Re: C++, Ada, ... Niklas Holsti <niklas.holsti@tidorum.invalid> - 2021-04-19 13:51 +0300
              Re: C++, Ada, ... David Brown <david.brown@hesbynett.no> - 2021-04-19 14:22 +0200
                Re: C++, Ada, ... Niklas Holsti <niklas.holsti@tidorum.invalid> - 2021-04-19 19:16 +0300
                Re: C++, Ada, ... David Brown <david.brown@hesbynett.no> - 2021-04-19 22:19 +0200
                Re: C++, Ada, ... Niklas Holsti <niklas.holsti@tidorum.invalid> - 2021-04-20 01:03 +0300
                Re: C++, Ada, ... Richard Damon <Richard@Damon-Family.org> - 2021-04-19 18:09 -0400
                Re: C++, Ada, ... David Brown <david.brown@hesbynett.no> - 2021-04-20 06:58 +0200
                Re: C++, Ada, ... Paul Rubin <no.email@nospam.invalid> - 2021-04-19 23:18 -0700
                Re: C++, Ada, ... David Brown <david.brown@hesbynett.no> - 2021-04-20 09:36 +0200
              Re: C++, Ada, ... Paul Rubin <no.email@nospam.invalid> - 2021-04-19 12:20 -0700
                Re: C++, Ada, ... Niklas Holsti <niklas.holsti@tidorum.invalid> - 2021-04-20 00:26 +0300
                Re: C++, Ada, ... Paul Rubin <no.email@nospam.invalid> - 2021-04-19 16:01 -0700
                Re: C++, Ada, ... Niklas Holsti <niklas.holsti@tidorum.invalid> - 2021-04-20 10:47 +0300
                Re: C++, Ada, ... Tom Gardner <spamjunk@blueyonder.co.uk> - 2021-04-19 23:30 +0100
    Re: C++, Ada, ... Clifford Heath <no.spam@please.net> - 2021-04-18 08:29 +1000
    Re: C++, Ada, ... Niklas Holsti <niklas.holsti@tidorum.invalid> - 2021-04-18 10:39 +0300
      Re: C++, Ada, ... David Brown <david.brown@hesbynett.no> - 2021-04-18 14:59 +0200
        Re: C++, Ada, ... Niklas Holsti <niklas.holsti@tidorum.invalid> - 2021-04-18 19:23 +0300
          Re: C++, Ada, ... David Brown <david.brown@hesbynett.no> - 2021-04-18 19:26 +0200
            Re: C++, Ada, ... Tom Gardner <spamjunk@blueyonder.co.uk> - 2021-04-18 19:29 +0100
              Re: C++, Ada, ... David Brown <david.brown@hesbynett.no> - 2021-04-18 22:23 +0200
                Re: C++, Ada, ... Tom Gardner <spamjunk@blueyonder.co.uk> - 2021-04-18 23:09 +0100
                Re: C++, Ada, ... David Brown <david.brown@hesbynett.no> - 2021-04-19 08:56 +0200
                Re: C++, Ada, ... Niklas Holsti <niklas.holsti@tidorum.invalid> - 2021-04-19 14:04 +0300
                Re: C++, Ada, ... Dimiter_Popoff <dp@tgi-sci.com> - 2021-04-19 15:16 +0300
                Re: C++, Ada, ... Paul Rubin <no.email@nospam.invalid> - 2021-04-19 12:47 -0700
                Re: C++, Ada, ... Niklas Holsti <niklas.holsti@tidorum.invalid> - 2021-04-20 00:37 +0300
                Re: C++, Ada, ... David Brown <david.brown@hesbynett.no> - 2021-04-20 07:50 +0200
                Re: C++, Ada, ... David Brown <david.brown@hesbynett.no> - 2021-04-19 14:26 +0200
            Re: C++, Ada, ... Tom Gardner <spamjunk@blueyonder.co.uk> - 2021-04-18 19:30 +0100
              Re: C++, Ada, ... David Brown <david.brown@hesbynett.no> - 2021-04-18 22:17 +0200
                Re: C++, Ada, ... Tom Gardner <spamjunk@blueyonder.co.uk> - 2021-04-18 23:17 +0100
                Re: C++, Ada, ... David Brown <david.brown@hesbynett.no> - 2021-04-19 08:52 +0200
                Re: C++, Ada, ... Tom Gardner <spamjunk@blueyonder.co.uk> - 2021-04-19 10:08 +0100
                Re: C++, Ada, ... David Brown <david.brown@hesbynett.no> - 2021-04-19 12:15 +0200
                Re: C++, Ada, ... Tom Gardner <spamjunk@blueyonder.co.uk> - 2021-04-19 12:00 +0100
                Re: C++, Ada, ... Tauno Voipio <tauno.voipio@notused.fi.invalid> - 2021-04-19 16:15 +0300
                Re: C++, Ada, ... David Brown <david.brown@hesbynett.no> - 2021-04-19 15:43 +0200
    Re: C++, Ada, ... pozz <pozzugno@gmail.com> - 2021-04-19 18:38 +0200
      Re: C++, Ada, ... Paul Rubin <no.email@nospam.invalid> - 2021-04-19 10:48 -0700
      Re: C++, Ada, ... Tom Gardner <spamjunk@blueyonder.co.uk> - 2021-04-19 19:33 +0100
        Re: C++, Ada, ... Tauno Voipio <tauno.voipio@notused.fi.invalid> - 2021-04-20 15:09 +0300
          Re: C++, Ada, ... Tom Gardner <spamjunk@blueyonder.co.uk> - 2021-04-20 15:29 +0100
      Re: C++, Ada, ... David Brown <david.brown@hesbynett.no> - 2021-04-19 22:48 +0200
        Re: C++, Ada, ... pozz <pozzugno@gmail.com> - 2021-04-19 23:17 +0200
          Re: C++, Ada, ... Paul Rubin <no.email@nospam.invalid> - 2021-04-19 15:55 -0700
            Re: C++, Ada, ... David Brown <david.brown@hesbynett.no> - 2021-04-20 08:21 +0200
          Re: C++, Ada, ... David Brown <david.brown@hesbynett.no> - 2021-04-20 08:20 +0200
  Re: C++, Ada, ... Dave Nadler <drn@nadler.com> - 2021-04-17 21:07 -0400
    Re: C++, Ada, ... Don Y <blockedofcourse@foo.invalid> - 2021-04-17 18:53 -0700
    Re: C++, Ada, ... Tom Gardner <spamjunk@blueyonder.co.uk> - 2021-04-18 09:42 +0100
  Re: C++, Ada, ... dalai lamah <antonio12358@hotmail.com> - 2021-04-18 14:39 +0200

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