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Re: Static_assert in 2017 C++

From David Brown <david.brown@hesbynett.no>
Newsgroups comp.lang.c++
Subject Re: Static_assert in 2017 C++
Date 2019-09-03 08:25 +0200
Organization A noiseless patient Spider
Message-ID <qkl11i$gpv$1@dont-email.me> (permalink)
References <31f1dc85-3b69-4787-8fa8-e4ee5836c609@googlegroups.com>

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On 01/09/2019 00:55, woodbrian77@gmail.com wrote:
>        Shalom
> 
> I have this line
> static_assert(::std::numeric_limits<float>::is_iec559,"Only IEEE754 supported");
> 
> in my library: https://github.com/Ebenezer-group/onwards
> 
> .  I wrote that line when I was using 2011 C++ and the comment
> was required.  Now I require 2017 C++ and am trying to decide between:
> 
> a. remove the comment
> b. reduce the comment to just "IEEE754", or
> c. leave it as it is.
> 

The static_assert message is what users see when the assertion fails. 
That is your guide.

If the check itself is information enough, you don't need a message.  If 
it is not clear (perhaps users don't know what "is_iec559" means - but 
/would/ know what "IEEE format floating point" means), use a message.

You can also use it to give more detail of /why/ the assertion is there 
- "IEEE floating point required to ensure binary compatibility", or 
"Only tested with IEEE floating point format".  Then the user can get an 
idea of the reasoning for the assertion, and the consequences of 
removing it (will it break something, or is it merely untested?).

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Static_assert in 2017 C++ woodbrian77@gmail.com - 2019-08-31 15:55 -0700
  Re: Static_assert in 2017 C++ Mr Flibble <flibbleREMOVETHISBIT@i42.co.uk> - 2019-09-01 11:43 +0100
    Re: Static_assert in 2017 C++ rick.c.hodgin@gmail.com - 2019-09-01 04:16 -0700
      Re: Static_assert in 2017 C++ Mr Flibble <flibbleREMOVETHISBIT@i42.co.uk> - 2019-09-01 13:15 +0100
    Re: Static_assert in 2017 C++ Bonita Montero <Bonita.Montero@gmail.com> - 2019-09-01 14:56 +0200
      Re: Static_assert in 2017 C++ Mr Flibble <flibbleREMOVETHISBIT@i42.co.uk> - 2019-09-01 14:20 +0100
        Re: Static_assert in 2017 C++ Bonita Montero <Bonita.Montero@gmail.com> - 2019-09-01 15:35 +0200
          Re: Static_assert in 2017 C++ Ian Collins <ian-news@hotmail.com> - 2019-09-02 07:30 +1200
            Re: Static_assert in 2017 C++ Bonita Montero <Bonita.Montero@gmail.com> - 2019-09-02 07:16 +0200
              Re: Static_assert in 2017 C++ David Brown <david.brown@hesbynett.no> - 2019-09-02 13:13 +0200
                Re: Static_assert in 2017 C++ Bonita Montero <Bonita.Montero@gmail.com> - 2019-09-02 15:55 +0200
                Re: Static_assert in 2017 C++ David Brown <david.brown@hesbynett.no> - 2019-09-02 22:02 +0200
  Re: Static_assert in 2017 C++ Bonita Montero <Bonita.Montero@gmail.com> - 2019-09-01 12:48 +0200
    Re: Static_assert in 2017 C++ Robert Wessel <robertwessel2@yahoo.com> - 2019-09-01 09:21 -0500
      Re: Static_assert in 2017 C++ woodbrian77@gmail.com - 2019-09-01 09:53 -0700
        Re: Static_assert in 2017 C++ Robert Wessel <robertwessel2@yahoo.com> - 2019-09-01 22:29 -0500
          Re: Static_assert in 2017 C++ Robert Wessel <robertwessel2@yahoo.com> - 2019-09-01 22:34 -0500
            Re: Static_assert in 2017 C++ woodbrian77@gmail.com - 2019-09-02 07:32 -0700
      Re: Static_assert in 2017 C++ "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2019-09-01 20:35 -0700
        Re: Static_assert in 2017 C++ Robert Wessel <robertwessel2@yahoo.com> - 2019-09-01 22:50 -0500
          Re: Static_assert in 2017 C++ "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2019-09-01 21:12 -0700
            Re: Static_assert in 2017 C++ Robert Wessel <robertwessel2@yahoo.com> - 2019-09-02 00:09 -0500
              Re: Static_assert in 2017 C++ "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2019-09-01 22:39 -0700
              Re: Static_assert in 2017 C++ "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2019-09-04 22:49 -0700
          Re: Static_assert in 2017 C++ "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2019-09-01 21:13 -0700
            Re: Static_assert in 2017 C++ Robert Wessel <robertwessel2@yahoo.com> - 2019-09-02 00:20 -0500
              Re: Static_assert in 2017 C++ "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2019-09-01 22:41 -0700
        Re: Static_assert in 2017 C++ Bonita Montero <Bonita.Montero@gmail.com> - 2019-09-02 07:14 +0200
          Re: Static_assert in 2017 C++ "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2019-09-01 22:46 -0700
            Re: Static_assert in 2017 C++ Bonita Montero <Bonita.Montero@gmail.com> - 2019-09-02 07:55 +0200
              Re: Static_assert in 2017 C++ "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2019-09-01 22:58 -0700
                Re: Static_assert in 2017 C++ Bonita Montero <Bonita.Montero@gmail.com> - 2019-09-02 08:20 +0200
                Re: Static_assert in 2017 C++ "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2019-09-01 23:24 -0700
                Re: Static_assert in 2017 C++ "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2019-09-01 23:25 -0700
                Re: Static_assert in 2017 C++ "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2019-09-01 23:26 -0700
                Re: Static_assert in 2017 C++ Bonita Montero <Bonita.Montero@gmail.com> - 2019-09-02 08:33 +0200
                Re: Static_assert in 2017 C++ "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2019-09-02 00:18 -0700
                Re: Static_assert in 2017 C++ Bonita Montero <Bonita.Montero@gmail.com> - 2019-09-02 09:23 +0200
                Re: Static_assert in 2017 C++ "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2019-09-02 00:26 -0700
              Re: Static_assert in 2017 C++ "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2019-09-01 22:58 -0700
                Re: Static_assert in 2017 C++ "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2019-09-01 22:59 -0700
                Re: Static_assert in 2017 C++ "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2019-09-04 23:04 -0700
  Re: Static_assert in 2017 C++ Richard Damon <Richard@Damon-Family.org> - 2019-09-01 15:39 -0400
    Re: Static_assert in 2017 C++ woodbrian77@gmail.com - 2019-09-01 18:58 -0700
      Re: Static_assert in 2017 C++ Richard Damon <Richard@Damon-Family.org> - 2019-09-02 17:40 -0400
        Re: Static_assert in 2017 C++ James Kuyper <jameskuyper@alumni.caltech.edu> - 2019-09-02 22:53 -0400
        Re: Static_assert in 2017 C++ David Brown <david.brown@hesbynett.no> - 2019-09-03 08:21 +0200
    Re: Static_assert in 2017 C++ Jorgen Grahn <grahn+nntp@snipabacken.se> - 2019-09-02 14:43 +0000
  Re: Static_assert in 2017 C++ Keith Thompson <kst-u@mib.org> - 2019-09-01 20:48 -0700
  Re: Static_assert in 2017 C++ David Brown <david.brown@hesbynett.no> - 2019-09-03 08:25 +0200
    Re: Static_assert in 2017 C++ Keith Thompson <kst-u@mib.org> - 2019-09-03 00:35 -0700
      Re: Static_assert in 2017 C++ David Brown <david.brown@hesbynett.no> - 2019-09-03 10:31 +0200

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