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Re: modifying local const variable run time

From David Brown <david.brown@hesbynett.no>
Newsgroups comp.lang.c
Subject Re: modifying local const variable run time
Date 2017-02-23 09:50 +0100
Organization A noiseless patient Spider
Message-ID <o8m7ld$sdn$2@dont-email.me> (permalink)
References (4 earlier) <ln1suqkul5.fsf@kst-u.example.com> <20170222183223.a4daa256d17cc9bfcc04d4b9@gmail.com> <lnshn6jesv.fsf@kst-u.example.com> <o8l1uk$eh$3@dont-email.me> <lno9xtke23.fsf@kst-u.example.com>

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On 23/02/17 00:20, Keith Thompson wrote:
> David Brown <david.brown@hesbynett.no> writes:
>> On 22/02/17 18:50, Keith Thompson wrote:
> [...]
>>> Personally, I use "const" mostly to make code clearer, so it's
>>> obvious at a glance to a human reader that a given object won't
>>> be modified, and so that the compiler can diagnose any incorrect
>>> attempt to modify it.  If a compiler can use that information to
>>> generate faster code, so much the better.
>>
>> Or more importantly, if the compiler can use that information to spot 
>> mistakes in the code - accidentally modifying the const object - then so 
>> much the better.  That's why the "const" keyword is much better than a 
>> "const" comment would have been, even if the comment were equally 
>> readable to humans.
> 
> I believe you're repeating part of what I wrote: "... and so that the
> compiler can diagnose any incorrect attempt to modify it".
> 

So I did - sorry.  (I could claim that I think static error checking is
so important that it is worth repeating it, but I think I just read too
fast late at night.)

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Thread

modifying local const variable run time rahul.dev.agg@gmail.com - 2017-02-22 06:39 -0800
  Re: modifying local const variable run time GOTHIER Nathan <nathan.gothier@gmail.com> - 2017-02-22 16:06 +0100
    Re: modifying local const variable run time rahul.dev.agg@gmail.com - 2017-02-22 07:26 -0800
      Re: modifying local const variable run time David Brown <david.brown@hesbynett.no> - 2017-02-22 16:31 +0100
        Re: modifying local const variable run time rahul.dev.agg@gmail.com - 2017-02-22 07:43 -0800
          Re: modifying local const variable run time Ben Bacarisse <ben.usenet@bsb.me.uk> - 2017-02-22 16:06 +0000
      Re: modifying local const variable run time James Kuyper <jameskuyper@verizon.net> - 2017-02-22 11:13 -0500
      Re: modifying local const variable run time supercat@casperkitty.com - 2017-02-22 08:34 -0800
        Re: modifying local const variable run time David Brown <david.brown@hesbynett.no> - 2017-02-22 23:03 +0100
      Re: modifying local const variable run time GOTHIER Nathan <nathan.gothier@gmail.com> - 2017-02-22 17:34 +0100
        Re: modifying local const variable run time Robert Wessel <robertwessel2@yahoo.com> - 2017-02-22 10:52 -0600
          Re: modifying local const variable run time GOTHIER Nathan <nathan.gothier@gmail.com> - 2017-02-22 17:52 +0100
            Re: modifying local const variable run time Keith Thompson <kst-u@mib.org> - 2017-02-22 09:33 -0800
            Re: modifying local const variable run time James Kuyper <jameskuyper@verizon.net> - 2017-02-22 15:50 -0500
              Re: modifying local const variable run time supercat@casperkitty.com - 2017-02-22 13:13 -0800
                Re: modifying local const variable run time Ben Bacarisse <ben.usenet@bsb.me.uk> - 2017-02-22 21:55 +0000
                Re: modifying local const variable run time supercat@casperkitty.com - 2017-02-22 14:43 -0800
        Re: modifying local const variable run time Keith Thompson <kst-u@mib.org> - 2017-02-22 09:23 -0800
          Re: modifying local const variable run time GOTHIER Nathan <nathan.gothier@gmail.com> - 2017-02-22 18:32 +0100
            Re: modifying local const variable run time Keith Thompson <kst-u@mib.org> - 2017-02-22 09:50 -0800
              Re: modifying local const variable run time David Brown <david.brown@hesbynett.no> - 2017-02-22 23:07 +0100
                Re: modifying local const variable run time Keith Thompson <kst-u@mib.org> - 2017-02-22 15:20 -0800
                Re: modifying local const variable run time David Brown <david.brown@hesbynett.no> - 2017-02-23 09:50 +0100
  Re: modifying local const variable run time James Kuyper <jameskuyper@verizon.net> - 2017-02-22 10:16 -0500
  Re: modifying local const variable run time Keith Thompson <kst-u@mib.org> - 2017-02-22 09:17 -0800

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