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Re: how to specify an 8 byte bool ?

From Lynn McGuire <lynnmcguire5@gmail.com>
Newsgroups comp.lang.c++
Subject Re: how to specify an 8 byte bool ?
Date 2022-10-05 21:05 -0500
Organization A noiseless patient Spider
Message-ID <thld59$36ts5$1@dont-email.me> (permalink)
References <thinbh$2pm70$1@dont-email.me> <87fsg3rn6s.fsf@nosuchdomain.example.com> <thiu1f$2t2ra$1@dont-email.me> <thksdo$14l$1@gioia.aioe.org> <31f4c07e-1ec1-4cd8-a095-bd58f6af64e9n@googlegroups.com>

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On 10/5/2022 8:45 PM, daniel...@gmail.com wrote:
> On Wednesday, October 5, 2022 at 5:20:09 PM UTC-4, F.Zwarts wrote:
>> Op 05.okt..2022 om 05:35 schreef Lynn McGuire:
> 
>>> I've got a double array, integer*8 array, logical*8 array, and
>>> character*8 array equivalenced in my Fortran code that I am converting
>>> to C++.  I want to have the same capability in my C++ code until I get
>>> down the road and figure out what I want to do with this code, if anything.
>> The Fortran EQUIVALENT is in my mind roughly equivalent to a C++ union.
> 
>> So, I would probably go for an array of unions. Where each union is a
>> union of a double, integer, bool and char[8]. The bool would then
>> automatically use the space of the largest type in the union.
> 
> I think it would be undefined behaviour to use a C++ union for a FORTRAN
> EQUIVALENCE statement. C++ (unlike C) does not permit type pruning.
> 
> Daniel

I assume that you mean type punning ???
    https://en.wikipedia.org/wiki/Type_punning

Lynn

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Thread

how to specify an 8 byte bool ? Lynn McGuire <lynnmcguire5@gmail.com> - 2022-10-04 20:41 -0500
  Re: how to specify an 8 byte bool ? Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2022-10-04 19:58 -0700
    Re: how to specify an 8 byte bool ? Lynn McGuire <lynnmcguire5@gmail.com> - 2022-10-04 22:35 -0500
      Re: how to specify an 8 byte bool ? Christian Gollwitzer <auriocus@gmx.de> - 2022-10-05 07:38 +0200
        Re: how to specify an 8 byte bool ? Lynn McGuire <lynnmcguire5@gmail.com> - 2022-10-05 14:02 -0500
        Re: how to specify an 8 byte bool ? Lynn McGuire <lynnmcguire5@gmail.com> - 2022-10-05 14:03 -0500
      Re: how to specify an 8 byte bool ? David Brown <david.brown@hesbynett.no> - 2022-10-05 09:38 +0200
        Re: how to specify an 8 byte bool ? Lynn McGuire <lynnmcguire5@gmail.com> - 2022-10-05 14:03 -0500
      Re: how to specify an 8 byte bool ? "Fred. Zwarts" <F.Zwarts@KVI.nl> - 2022-10-05 23:19 +0200
        Re: how to specify an 8 byte bool ? "daniel...@gmail.com" <danielaparker@gmail.com> - 2022-10-05 18:45 -0700
          Re: how to specify an 8 byte bool ? Lynn McGuire <lynnmcguire5@gmail.com> - 2022-10-05 21:05 -0500
            Re: how to specify an 8 byte bool ? "daniel...@gmail.com" <danielaparker@gmail.com> - 2022-10-05 19:07 -0700
          Re: how to specify an 8 byte bool ? "Fred. Zwarts" <F.Zwarts@KVI.nl> - 2022-10-06 10:39 +0200
          Re: how to specify an 8 byte bool ? David Brown <david.brown@hesbynett.no> - 2022-10-06 14:14 +0200
          Re: how to specify an 8 byte bool ? scott@slp53.sl.home (Scott Lurndal) - 2022-10-06 14:03 +0000
  Re: how to specify an 8 byte bool ? Lynn McGuire <lynnmcguire5@gmail.com> - 2022-10-05 14:10 -0500
    Re: how to specify an 8 byte bool ? scott@slp53.sl.home (Scott Lurndal) - 2022-10-05 20:34 +0000
      Re: how to specify an 8 byte bool ? Lynn McGuire <lynnmcguire5@gmail.com> - 2022-10-05 16:18 -0500
        Re: how to specify an 8 byte bool ? scott@slp53.sl.home (Scott Lurndal) - 2022-10-05 22:25 +0000
          Re: how to specify an 8 byte bool ? scott@slp53.sl.home (Scott Lurndal) - 2022-10-05 22:27 +0000
            Re: how to specify an 8 byte bool ? Lynn McGuire <lynnmcguire5@gmail.com> - 2022-10-05 19:16 -0500
    Re: how to specify an 8 byte bool ? David Brown <david.brown@hesbynett.no> - 2022-10-06 14:16 +0200
      Re: how to specify an 8 byte bool ? Lynn McGuire <lynnmcguire5@gmail.com> - 2022-10-06 15:07 -0500
        Re: how to specify an 8 byte bool ? David Brown <david.brown@hesbynett.no> - 2022-10-07 09:07 +0200
          Re: how to specify an 8 byte bool ? Lynn McGuire <lynnmcguire5@gmail.com> - 2022-10-07 14:23 -0500
  Re: how to specify an 8 byte bool ? Bonita Montero <Bonita.Montero@gmail.com> - 2022-10-10 18:04 +0200

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