Groups > comp.lang.c++ > #82079

Re: I think references should have been const by default

From	Bart <bc@freeuk.com>
Newsgroups	comp.lang.c++
Subject	Re: I think references should have been const by default
Date	2021-10-25 18:19 +0100
Organization	A noiseless patient Spider
Message-ID	<sl6ovb$qnp$1@dont-email.me> (permalink)
References	(11 earlier) <sl5pdi$4au$1@gioia.aioe.org> <sl5ug4$qov$1@gioia.aioe.org> <sl6ecq$11uu$1@gioia.aioe.org> <sl6go4$pjq$1@dont-email.me> <sl6l56$10d6$1@gioia.aioe.org>

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On 25/10/2021 17:14, RacingRabbit@watershipdown.co.uk wrote:
> On Mon, 25 Oct 2021 10:59:15 -0400
> James Kuyper <jameskuyper@alumni.caltech.edu> wrote:
>> On 10/25/21 10:19 AM, RacingRabbit@watershipdown.co.uk wrote:
>>>> call it with a pointer that's pointing to a string literal. If said
>>>> function does modify the "string" it's getting as parameter, that's UB.
>>>
>>> No idea what UB means, but what'll happen is it'll crash immediately so
>> you'll
>>> soon find out.
>>
>> UB means "Undefined Behavior", a technical term from the C standard
>> which does NOT mean "behavior for which there is no definition". It
>> means "behavior, upon use of a nonportable or erroneous program
>> construct or of erroneous data, for which this document imposes no
>> requirements" (3.4.3). Note that "this document" refers to the C
>> standard; other documents (such as compiler documentation or ABI
>> standards) might define the behavior, without changing the fact that is
>> qualifies as "undefined behavior" as far as the C standard is concerned.
> 
> Any attempt to write to a read only program text area will result in a crash
> regardless of the language.

Data is only put into readonly, write-protected memory when the data 
values are already known before the program starts.

Lots of uses of 'const' are for data not known until the program starts 
execution, and many of these will be reinitialised many times as they 
are declared inside blocks.

Other uses will make take normally mutable data and make it readonly 
when passed to function.

So using write-protected memory is not that much help.

Thread

I think references should have been const by default Juha Nieminen <nospam@thanks.invalid> - 2021-10-21 05:23 +0000
  Re: I think references should have been const by default David Brown <david.brown@hesbynett.no> - 2021-10-21 08:54 +0200
    Re: I think references should have been const by default Juha Nieminen <nospam@thanks.invalid> - 2021-10-21 09:48 +0000
      Re: I think references should have been const by default Paavo Helde <myfirstname@osa.pri.ee> - 2021-10-21 12:55 +0300
      Re: I think references should have been const by default David Brown <david.brown@hesbynett.no> - 2021-10-21 12:57 +0200
        Re: I think references should have been const by default RacingRabbit@watershipdown.co.uk - 2021-10-21 13:40 +0000
          Re: I think references should have been const by default Bart <bc@freeuk.com> - 2021-10-21 15:04 +0100
            Re: I think references should have been const by default Manfred <noname@add.invalid> - 2021-10-21 16:41 +0200
              Re: I think references should have been const by default RacingRabbit@watershipdown.co.uk - 2021-10-21 14:57 +0000
            Re: I think references should have been const by default RacingRabbit@watershipdown.co.uk - 2021-10-21 14:51 +0000
            Re: I think references should have been const by default James Kuyper <jameskuyper@alumni.caltech.edu> - 2021-10-21 12:09 -0400
              Re: I think references should have been const by default Bart <bc@freeuk.com> - 2021-10-21 23:49 +0100
                Re: I think references should have been const by default "james...@alumni.caltech.edu" <jameskuyper@alumni.caltech.edu> - 2021-10-21 16:21 -0700
                Re: I think references should have been const by default Bart <bc@freeuk.com> - 2021-10-22 16:14 +0100
                Re: I think references should have been const by default Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2021-10-22 12:04 -0700
                Re: I think references should have been const by default Bart <bc@freeuk.com> - 2021-10-22 20:47 +0100
                Re: I think references should have been const by default Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2021-10-22 13:29 -0700
                Re: I think references should have been const by default David Brown <david.brown@hesbynett.no> - 2021-10-23 11:54 +0200
                Re: I think references should have been const by default Bart <bc@freeuk.com> - 2021-10-23 11:22 +0100
                Re: I think references should have been const by default David Brown <david.brown@hesbynett.no> - 2021-10-23 12:35 +0200
                Re: I think references should have been const by default Ben Bacarisse <ben.usenet@bsb.me.uk> - 2021-10-23 13:23 +0100
                Re: I think references should have been const by default Bart <bc@freeuk.com> - 2021-10-23 13:57 +0100
                Re: I think references should have been const by default Ben Bacarisse <ben.usenet@bsb.me.uk> - 2021-10-23 21:02 +0100
                Re: I think references should have been const by default Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2021-10-23 15:07 -0700
                Re: I think references should have been const by default Tim Rentsch <tr.17687@z991.linuxsc.com> - 2021-10-23 21:15 -0700
                Re: I think references should have been const by default Tim Rentsch <tr.17687@z991.linuxsc.com> - 2021-10-23 21:12 -0700
              Re: I think references should have been const by default David Brown <david.brown@hesbynett.no> - 2021-10-22 11:13 +0200
                Re: I think references should have been const by default James Kuyper <jameskuyper@alumni.caltech.edu> - 2021-10-22 19:18 -0400
            Re: I think references should have been const by default Juha Nieminen <nospam@thanks.invalid> - 2021-10-22 04:41 +0000
              Re: I think references should have been const by default Chris Vine <chris@cvine--nospam--.freeserve.co.uk> - 2021-10-23 21:30 +0100
                Re: I think references should have been const by default Juha Nieminen <nospam@thanks.invalid> - 2021-10-25 04:51 +0000
                Re: I think references should have been const by default Chris Vine <chris@cvine--nospam--.freeserve.co.uk> - 2021-10-26 00:53 +0100
            Re: I think references should have been const by default David Brown <david.brown@hesbynett.no> - 2021-10-22 09:46 +0200
              Re: I think references should have been const by default Bart <bc@freeuk.com> - 2021-10-22 15:48 +0100
                Re: I think references should have been const by default David Brown <david.brown@hesbynett.no> - 2021-10-23 12:21 +0200
                Re: I think references should have been const by default Bart <bc@freeuk.com> - 2021-10-23 12:06 +0100
                Re: I think references should have been const by default David Brown <david.brown@hesbynett.no> - 2021-10-23 18:45 +0200
                Re: I think references should have been const by default Bart <bc@freeuk.com> - 2021-10-23 18:58 +0100
                Re: I think references should have been const by default David Brown <david.brown@hesbynett.no> - 2021-10-24 12:11 +0200
                Re: I think references should have been const by default Bart <bc@freeuk.com> - 2021-10-24 23:11 +0100
                Re: I think references should have been const by default Öö Tiib <ootiib@hot.ee> - 2021-10-24 16:18 -0700
                Re: I think references should have been const by default Bart <bc@freeuk.com> - 2021-10-25 00:58 +0100
                Re: I think references should have been const by default RacingRabbit@watershipdown.co.uk - 2021-10-25 08:21 +0000
                Re: I think references should have been const by default Juha Nieminen <nospam@thanks.invalid> - 2021-10-25 09:47 +0000
                Re: I think references should have been const by default Bo Persson <bo@bo-persson.se> - 2021-10-25 12:33 +0200
                Re: I think references should have been const by default RacingRabbit@watershipdown.co.uk - 2021-10-25 14:19 +0000
                Re: I think references should have been const by default James Kuyper <jameskuyper@alumni.caltech.edu> - 2021-10-25 10:59 -0400
                Re: I think references should have been const by default Manfred <noname@add.invalid> - 2021-10-25 17:56 +0200
                Re: I think references should have been const by default Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2021-10-25 11:11 -0700
                Re: I think references should have been const by default Manfred <noname@add.invalid> - 2021-10-26 17:15 +0200
                Re: I think references should have been const by default Tim Rentsch <tr.17687@z991.linuxsc.com> - 2021-10-29 06:41 -0700
                Re: I think references should have been const by default RacingRabbit@watershipdown.co.uk - 2021-10-25 16:14 +0000
                Re: I think references should have been const by default James Kuyper <jameskuyper@alumni.caltech.edu> - 2021-10-25 13:14 -0400
                Re: I think references should have been const by default RacingRabbit@watershipdown.co.uk - 2021-10-26 08:18 +0000
                Re: I think references should have been const by default Bart <bc@freeuk.com> - 2021-10-26 12:39 +0100
                Re: I think references should have been const by default Ben Bacarisse <ben.usenet@bsb.me.uk> - 2021-10-26 14:29 +0100
                Re: I think references should have been const by default Bart <bc@freeuk.com> - 2021-10-26 15:11 +0100
                Re: I think references should have been const by default Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2021-10-26 09:49 -0700
                Re: I think references should have been const by default Bart <bc@freeuk.com> - 2021-10-26 18:38 +0100
                Re: I think references should have been const by default Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2021-10-26 11:20 -0700
                Re: I think references should have been const by default Bart <bc@freeuk.com> - 2021-10-26 20:32 +0100
                Re: I think references should have been const by default David Brown <david.brown@hesbynett.no> - 2021-10-26 22:18 +0200
                Re: I think references should have been const by default Juha Nieminen <nospam@thanks.invalid> - 2021-10-27 04:43 +0000
                Re: I think references should have been const by default David Brown <david.brown@hesbynett.no> - 2021-10-27 08:29 +0200
                Re: I think references should have been const by default Tim Rentsch <tr.17687@z991.linuxsc.com> - 2021-10-29 06:32 -0700
                Re: I think references should have been const by default Juha Nieminen <nospam@thanks.invalid> - 2021-11-01 06:12 +0000
                Re: I think references should have been const by default David Brown <david.brown@hesbynett.no> - 2021-11-01 08:53 +0100
                Re: I think references should have been const by default James Kuyper <jameskuyper@alumni.caltech.edu> - 2021-11-01 11:26 -0400
                Re: I think references should have been const by default "Alf P. Steinbach" <alf.p.steinbach@gmail.com> - 2021-11-02 16:19 +0100
                Re: I think references should have been const by default James Kuyper <jameskuyper@alumni.caltech.edu> - 2021-11-02 12:54 -0400
                Re: I think references should have been const by default Paavo Helde <myfirstname@osa.pri.ee> - 2021-11-02 23:49 +0200
                Re: I think references should have been const by default "Alf P. Steinbach" <alf.p.steinbach@gmail.com> - 2021-11-03 00:38 +0100
                Re: I think references should have been const by default RacingRabbit@watershipdown.co.uk - 2021-10-26 14:36 +0000
                Re: I think references should have been const by default Bart <bc@freeuk.com> - 2021-10-26 15:55 +0100
                Re: I think references should have been const by default RacingRabbit@watershipdown.co.uk - 2021-10-26 15:26 +0000
                Re: I think references should have been const by default Bart <bc@freeuk.com> - 2021-10-26 20:35 +0100
                Re: I think references should have been const by default Juha Nieminen <nospam@thanks.invalid> - 2021-10-27 04:44 +0000
                Re: I think references should have been const by default James Kuyper <jameskuyper@alumni.caltech.edu> - 2021-10-26 11:27 -0400
                Re: I think references should have been const by default James Kuyper <jameskuyper@alumni.caltech.edu> - 2021-10-26 10:31 -0400
                Re: I think references should have been const by default RacingRabbit@watershipdown.co.uk - 2021-10-26 14:42 +0000
                Re: I think references should have been const by default James Kuyper <jameskuyper@alumni.caltech.edu> - 2021-10-26 11:22 -0400
                Re: I think references should have been const by default RacingRabbit@watershipdown.co.uk - 2021-10-26 15:30 +0000
                Re: I think references should have been const by default James Kuyper <jameskuyper@alumni.caltech.edu> - 2021-10-26 12:23 -0400
                Re: I think references should have been const by default James Kuyper <jameskuyper@alumni.caltech.edu> - 2021-10-26 12:51 -0400
                Re: I think references should have been const by default James Kuyper <jameskuyper@alumni.caltech.edu> - 2021-10-26 14:34 -0400
                Re: I think references should have been const by default "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2021-10-26 12:57 -0700
                Re: I think references should have been const by default RacingRabbit@watershipdown.co.uk - 2021-10-27 07:57 +0000
                Re: I think references should have been const by default Juha Nieminen <nospam@thanks.invalid> - 2021-10-27 08:47 +0000
                Re: I think references should have been const by default JohnnyCameLater@whatsthetime.net - 2021-10-27 14:29 +0000
                Re: I think references should have been const by default Juha Nieminen <nospam@thanks.invalid> - 2021-10-28 05:17 +0000
                Re: I think references should have been const by default JohnnyCameLater@whatsthetime.net - 2021-10-28 09:30 +0000
                Re: I think references should have been const by default Juha Nieminen <nospam@thanks.invalid> - 2021-10-29 04:47 +0000
                Re: I think references should have been const by default Juha Nieminen <nospam@thanks.invalid> - 2021-10-29 05:11 +0000
                Re: I think references should have been const by default JohnnyCameLater@whatsthetime.net - 2021-10-29 08:40 +0000
                Re: I think references should have been const by default Juha Nieminen <nospam@thanks.invalid> - 2021-11-01 06:15 +0000
                Re: I think references should have been const by default David Brown <david.brown@hesbynett.no> - 2021-10-27 11:07 +0200
                Re: I think references should have been const by default JohnnyCameLater@whatsthetime.net - 2021-10-27 14:30 +0000
                Re: I think references should have been const by default David Brown <david.brown@hesbynett.no> - 2021-10-27 17:30 +0200
                Re: I think references should have been const by default JohnnyCameLater@whatsthetime.net - 2021-10-27 15:46 +0000
                Re: I think references should have been const by default scott@slp53.sl.home (Scott Lurndal) - 2021-10-27 16:13 +0000
                Re: I think references should have been const by default James Kuyper <jameskuyper@alumni.caltech.edu> - 2021-10-27 11:39 -0400
                Re: I think references should have been const by default JohnnyCameLater@whatsthetime.net - 2021-10-27 15:51 +0000
                Re: I think references should have been const by default Ben Bacarisse <ben.usenet@bsb.me.uk> - 2021-10-27 17:21 +0100
                Re: I think references should have been const by default JohnnyCameLater@whatsthetime.net - 2021-10-28 09:29 +0000
                Re: I think references should have been const by default Bart <bc@freeuk.com> - 2021-10-28 11:20 +0100
                Re: I think references should have been const by default James Kuyper <jameskuyper@alumni.caltech.edu> - 2021-10-27 12:26 -0400
                Re: I think references should have been const by default Anand Hariharan <mailto.anand.hariharan@gmail.com> - 2021-10-31 09:22 -0700
                Re: I think references should have been const by default James Kuyper <jameskuyper@alumni.caltech.edu> - 2021-11-01 00:13 -0400
                Re: I think references should have been const by default Juha Nieminen <nospam@thanks.invalid> - 2021-10-28 05:20 +0000
                Re: I think references should have been const by default "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2021-10-27 23:10 -0700
                Re: I think references should have been const by default JohnnyCameLater@whatsthetime.net - 2021-10-28 09:30 +0000
                Re: I think references should have been const by default Juha Nieminen <nospam@thanks.invalid> - 2021-10-29 04:51 +0000
                Re: I think references should have been const by default JohnnyCameLater@whatsthetime.net - 2021-10-29 08:39 +0000
                Re: I think references should have been const by default Juha Nieminen <nospam@thanks.invalid> - 2021-11-01 06:34 +0000
                Re: I think references should have been const by default Chris Vine <chris@cvine--nospam--.freeserve.co.uk> - 2021-10-27 17:41 +0100
                Re: I think references should have been const by default David Brown <david.brown@hesbynett.no> - 2021-10-27 19:02 +0200
                Re: I think references should have been const by default Chris Vine <chris@cvine--nospam--.freeserve.co.uk> - 2021-10-27 18:21 +0100
                Re: I think references should have been const by default James Kuyper <jameskuyper@alumni.caltech.edu> - 2021-10-27 11:38 -0400
                Re: I think references should have been const by default JohnnyCameLater@whatsthetime.net - 2021-10-27 15:49 +0000
                Re: I think references should have been const by default James Kuyper <jameskuyper@alumni.caltech.edu> - 2021-10-27 12:36 -0400
                Re: I think references should have been const by default Juha Nieminen <nospam@thanks.invalid> - 2021-10-27 04:57 +0000
                Re: I think references should have been const by default Bart <bc@freeuk.com> - 2021-10-25 18:19 +0100
                Re: I think references should have been const by default Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2021-10-25 10:48 -0700
                Re: I think references should have been const by default RacingRabbit@watershipdown.co.uk - 2021-10-26 08:21 +0000
                Re: I think references should have been const by default Juha Nieminen <nospam@thanks.invalid> - 2021-10-26 08:37 +0000
                Re: I think references should have been const by default RacingRabbit@watershipdown.co.uk - 2021-10-26 09:02 +0000
                Re: I think references should have been const by default Juha Nieminen <nospam@thanks.invalid> - 2021-10-26 11:14 +0000
                Re: I think references should have been const by default RacingRabbit@watershipdown.co.uk - 2021-10-26 14:35 +0000
                Re: I think references should have been const by default Juha Nieminen <nospam@thanks.invalid> - 2021-10-27 05:01 +0000
                Re: I think references should have been const by default Tim Rentsch <tr.17687@z991.linuxsc.com> - 2021-10-29 06:34 -0700
                Re: I think references should have been const by default James Kuyper <jameskuyper@alumni.caltech.edu> - 2021-10-26 10:43 -0400
                Re: I think references should have been const by default RacingRabbit@watershipdown.co.uk - 2021-10-26 15:21 +0000
                Re: I think references should have been const by default David Brown <david.brown@hesbynett.no> - 2021-10-26 22:32 +0200
                Re: I think references should have been const by default Juha Nieminen <nospam@thanks.invalid> - 2021-10-27 05:04 +0000
                Re: I think references should have been const by default James Kuyper <jameskuyper@alumni.caltech.edu> - 2021-10-26 10:42 -0400
                Re: I think references should have been const by default RacingRabbit@watershipdown.co.uk - 2021-10-26 14:48 +0000
                Re: I think references should have been const by default James Kuyper <jameskuyper@alumni.caltech.edu> - 2021-10-26 11:52 -0400
                Re: I think references should have been const by default Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2021-10-26 10:22 -0700
                Re: I think references should have been const by default Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2021-10-26 10:27 -0700
                Re: I think references should have been const by default James Kuyper <jameskuyper@alumni.caltech.edu> - 2021-10-26 14:06 -0400
                Re: I think references should have been const by default Tim Rentsch <tr.17687@z991.linuxsc.com> - 2021-10-29 06:45 -0700
                Re: I think references should have been const by default Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2021-10-29 11:11 -0700
                Re: I think references should have been const by default Tim Rentsch <tr.17687@z991.linuxsc.com> - 2022-04-25 07:39 -0700
                Re: I think references should have been const by default Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2022-04-25 10:59 -0700
                Re: I think references should have been const by default Juha Nieminen <nospam@thanks.invalid> - 2021-10-26 05:29 +0000
                Re: I think references should have been const by default David Brown <david.brown@hesbynett.no> - 2021-10-26 08:53 +0200
                Re: I think references should have been const by default RacingRabbit@watershipdown.co.uk - 2021-10-26 08:23 +0000
                Re: I think references should have been const by default Juha Nieminen <nospam@thanks.invalid> - 2021-10-26 08:40 +0000
                Re: I think references should have been const by default Juha Nieminen <nospam@thanks.invalid> - 2021-10-26 05:18 +0000
                Re: I think references should have been const by default David Brown <david.brown@hesbynett.no> - 2021-10-26 09:07 +0200
                Re: I think references should have been const by default James Kuyper <jameskuyper@alumni.caltech.edu> - 2021-10-26 11:03 -0400
                Re: I think references should have been const by default James Kuyper <jameskuyper@alumni.caltech.edu> - 2021-10-25 10:39 -0400
                Re: I think references should have been const by default Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2021-10-25 10:56 -0700
                Re: I think references should have been const by default James Kuyper <jameskuyper@alumni.caltech.edu> - 2021-10-25 10:30 -0400
                Re: I think references should have been const by default RacingRabbit@watershipdown.co.uk - 2021-10-25 14:39 +0000
                Re: I think references should have been const by default James Kuyper <jameskuyper@alumni.caltech.edu> - 2021-10-25 11:05 -0400
                Re: I think references should have been const by default "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2021-10-25 12:45 -0700
                Re: I think references should have been const by default "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2021-10-26 11:20 -0700
                Re: I think references should have been const by default Juha Nieminen <nospam@thanks.invalid> - 2021-10-25 05:00 +0000
                Re: I think references should have been const by default Bart <bc@freeuk.com> - 2021-10-25 12:13 +0100
                Re: I think references should have been const by default Juha Nieminen <nospam@thanks.invalid> - 2021-10-26 05:36 +0000
                Re: I think references should have been const by default Manfred <noname@add.invalid> - 2021-10-25 16:58 +0200
    Re: I think references should have been const by default "daniel...@gmail.com" <danielaparker@gmail.com> - 2021-10-22 12:28 -0700
  Re: I think references should have been const by default RacingRabbit@watershipdown.co.uk - 2021-10-21 09:12 +0000
    Re: I think references should have been const by default Juha Nieminen <nospam@thanks.invalid> - 2021-10-21 09:52 +0000
      Re: I think references should have been const by default RacingRabbit@watershipdown.co.uk - 2021-10-21 10:36 +0000
        Re: I think references should have been const by default Juha Nieminen <nospam@thanks.invalid> - 2021-10-22 04:45 +0000
    Re: I think references should have been const by default James Kuyper <jameskuyper@alumni.caltech.edu> - 2021-10-21 12:07 -0400
  Re: I think references should have been const by default Paavo Helde <myfirstname@osa.pri.ee> - 2021-10-21 12:18 +0300
  Re: I think references should have been const by default Bonita Montero <Bonita.Montero@gmail.com> - 2021-10-21 13:13 +0200
    Re: I think references should have been const by default Bo Persson <bo@bo-persson.se> - 2021-10-21 15:08 +0200
    Re: I think references should have been const by default Juha Nieminen <nospam@thanks.invalid> - 2021-10-22 04:45 +0000
      Re: I think references should have been const by default Bonita Montero <Bonita.Montero@gmail.com> - 2021-10-22 07:55 +0200
        Re: I think references should have been const by default Branimir Maksimovic <branimir.maksimovic@icloud.com> - 2021-10-22 11:21 +0000
  Re: I think references should have been const by default "Alf P. Steinbach" <alf.p.steinbach@gmail.com> - 2021-10-21 13:22 +0200
    Re: I think references should have been const by default Juha Nieminen <nospam@thanks.invalid> - 2021-10-22 04:48 +0000
  Re: I think references should have been const by default Manfred <noname@add.invalid> - 2021-10-21 13:57 +0200
  Re: I think references should have been const by default Branimir Maksimovic <branimir.maksimovic@icloud.com> - 2021-10-21 21:27 +0000
  Re: I think references should have been const by default Jorgen Grahn <grahn+nntp@snipabacken.se> - 2021-10-24 14:20 +0000

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