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Groups > comp.lang.c++ > #86769
| From | Manfred <noname@add.invalid> |
|---|---|
| Newsgroups | comp.lang.c++ |
| Subject | Re: ???Microsoft Azure CTO Mark Russinovich: C/C++ should be deprecated??? |
| Date | 2022-10-02 22:05 +0200 |
| Organization | Aioe.org NNTP Server |
| Message-ID | <thcqug$16r$1@gioia.aioe.org> (permalink) |
| References | (18 earlier) <th4p4g$nns9$1@dont-email.me> <20220930100037.560@kylheku.com> <thbt7p$1mgus$1@dont-email.me> <87sfk6qvtb.fsf@bsb.me.uk> <thc6ni$1n90q$1@dont-email.me> |
On 10/2/2022 4:20 PM, David Brown wrote:
> On 02/10/2022 14:00, Ben Bacarisse wrote:
>> David Brown <david.brown@hesbynett.no> writes:
>>
>>> On 30/09/2022 19:20, Kaz Kylheku wrote:
>> <cut>
>>>> Speaking of returning the cross-posting to comp.lang.c++, that language
>>>> as of C++17 has chosen to define some evaluation orders.
>>>
>>> Yes. Primarily it is for the case of "cout << a() << b();". This is
>>> a situation where specific ordering really does help the programmer.
>>
>> I'm curious. How does a specific ordering help the programmer here?
>> Even with no specified order of evaluation, the output must look as if
>> the result of b() was appended to the stream resulting from the
>> left-most << operator. All the ordering does is cause any side effects
>> in a() and b() to be predictably ordered, and that might look more like
>> helping the programmer to write dodgy code.
>>
>
> Yes, it is a matter of side-effects. Without side-effects in "a()" or
> "b()", the result is clear regardless of the order of evaluation.
>
> And if there are side-effects, and order matters, then programmers can
> (and should, at least until C++17) write along the lines of :
>
> const auto res_a = a();
> const auto res_b = b();
> cout << res_a << res_b;
>
I disagree that this change is to be interpreted as "giving some help to
bad programmers".
The key point is that this is about the insertion operator, not binary
shift (here the C++ syntax does not help indeed)
Insertion operators, and specifically in combination with streams, have
been explicitly designed /from day one/ to allow for:
cout <<
value_1 <<
value_2 <<
value_3 <<
value_4 <<
value_5 <<
value_6;
Along the same lines:
cout <<
f_1() <<
f_2() <<
f_3() <<
f_4() <<
f_5() <<
f_6();
Is just expected semantics, which good language design should account for.
I am pretty confident that the construct that you suggest as "the right
way" was not the intention of the language designers - think e.g. IO
manipulators.
> But it seems that many programmers have been assuming that using
> iostreams for output like this has a specified order - even when they
> don't make such assumptions about other kinds of expressions. I suppose
> it is something about the appearance of the code that makes it look like
> there is an order to the evaluation.
>
> Maybe it is not accurate to say this "helps the programmer", and it is
> more correct to say that it makes what used to be dodgy code into
> correct code. But if it means their old dodgy code continues to work as
> they intended even when they use newer compilers that do more
> re-ordering optimisations, then it helps them.
>
> A disadvantage of this change is that it might make some programmers
> think ordering is more tightly specified for other kinds of expression
> as well, and rely on such incorrect assumptions.
>
> (I'm not convinced that this evaluation order change in C++17 is a good
> idea, or worth the complications of having this special case. I am just
> trying to say why it is different from a more general evaluation order
> specification, and why the C++ committee thought it was worth changing.)
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“Microsoft Azure CTO Mark Russinovich: C/C++ should be deprecated” Lynn McGuire <lynnmcguire5@gmail.com> - 2022-09-21 14:04 -0500
Re: “Microsoft Azure CTO Mark Russinovich: C/C++ should be deprecated” "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2022-09-21 12:28 -0700
Re: ???Microsoft Azure CTO Mark Russinovich: C/C++ should be deprecated??? Juha Nieminen <nospam@thanks.invalid> - 2022-09-22 06:16 +0000
Re: ???Microsoft Azure CTO Mark Russinovich: C/C++ should be deprecated??? David Brown <david.brown@hesbynett.no> - 2022-09-22 09:45 +0200
Re: ???Microsoft Azure CTO Mark Russinovich: C/C++ should be deprecated??? Blue-Maned_Hawk <bluemanedhawk@gmail.com> - 2022-09-26 02:07 -0400
Re: ???Microsoft Azure CTO Mark Russinovich: C/C++ should be deprecated??? David Brown <david.brown@hesbynett.no> - 2022-09-26 08:42 +0200
Re: ???Microsoft Azure CTO Mark Russinovich: C/C++ should be Muttley@dastardlyhq.com - 2022-09-26 15:24 +0000
Re: ???Microsoft Azure CTO Mark Russinovich: C/C++ should be "daniel...@gmail.com" <danielaparker@gmail.com> - 2022-09-26 09:00 -0700
Re: ???Microsoft Azure CTO Mark Russinovich: C/C++ should be Muttley@dastardlyhq.com - 2022-09-26 16:11 +0000
Re: ???Microsoft Azure CTO Mark Russinovich: C/C++ should be "daniel...@gmail.com" <danielaparker@gmail.com> - 2022-09-26 09:22 -0700
Re: ???Microsoft Azure CTO Mark Russinovich: C/C++ should be deprecated??? Juha Nieminen <nospam@thanks.invalid> - 2022-09-22 09:41 +0000
Re: ???Microsoft Azure CTO Mark Russinovich: C/C++ should be deprecated??? Ben Bacarisse <ben.usenet@bsb.me.uk> - 2022-09-22 16:46 +0100
Re: ???Microsoft Azure CTO Mark Russinovich: C/C++ should be deprecated??? gazelle@shell.xmission.com (Kenny McCormack) - 2022-09-22 16:15 +0000
Re: ???Microsoft Azure CTO Mark Russinovich: C/C++ should be deprecated??? David Brown <david.brown@hesbynett.no> - 2022-09-22 20:43 +0200
Re: ???Microsoft Azure CTO Mark Russinovich: C/C++ should be deprecated??? Ben Bacarisse <ben.usenet@bsb.me.uk> - 2022-09-22 20:15 +0100
Re: ???Microsoft Azure CTO Mark Russinovich: C/C++ should be deprecated??? David Brown <david.brown@hesbynett.no> - 2022-09-22 22:56 +0200
Re: ???Microsoft Azure CTO Mark Russinovich: C/C++ should be deprecated??? Bart <bc@freeuk.com> - 2022-09-22 23:15 +0100
g++ with -O6 slower than with -O2 [was Re: "Microsoft Azure CTO Mark Russinovich: C/C++ should be deprecated"] Ralf Goertz <me@myprovider.invalid> - 2022-09-23 13:44 +0200
Re: g++ with -O6 slower than with -O2 [was Re: "Microsoft Azure CTO Mark Russinovich: C/C++ should be deprecated"] Bart <bc@freeuk.com> - 2022-09-23 13:53 +0100
Re: g++ with -O6 slower than with -O2 [was Re: "Microsoft Azure CTO Mark Russinovich: C/C++ should be deprecated"] David Brown <david.brown@hesbynett.no> - 2022-09-23 15:31 +0200
Re: g++ with -O6 slower than with -O2 [was Re: "Microsoft Azure CTO Mark Russinovich: C/C++ should be deprecated"] David Brown <david.brown@hesbynett.no> - 2022-09-23 15:53 +0200
Re: g++ with -O6 slower than with -O2 [was Re: "Microsoft Azure CTO Mark Russinovich: C/C++ should be deprecated"] Ralf Goertz <me@myprovider.invalid> - 2022-09-23 16:21 +0200
Re: g++ with -O6 slower than with -O2 [was Re: "Microsoft Azure CTO Mark Russinovich: C/C++ should be deprecated"] David Brown <david.brown@hesbynett.no> - 2022-09-24 17:05 +0200
Re: g++ with -O6 slower than with -O2 [was Re: "Microsoft Azure CTO Mark Russinovich: C/C++ should be deprecated"] red floyd <no.spam.here@its.invalid> - 2022-09-24 12:33 -0700
Re: g++ with -O6 slower than with -O2 [was Re: "Microsoft Azure CTO Muttley@dastardlyhq.com - 2022-09-25 08:45 +0000
Re: ???Microsoft Azure CTO Mark Russinovich: C/C++ should be deprecated??? Ben Bacarisse <ben.usenet@bsb.me.uk> - 2022-09-23 00:08 +0100
Re: ???Microsoft Azure CTO Mark Russinovich: C/C++ should be deprecated??? Juha Nieminen <nospam@thanks.invalid> - 2022-09-23 07:45 +0000
Re: ???Microsoft Azure CTO Mark Russinovich: C/C++ should be deprecated??? Paavo Helde <eesnimi@osa.pri.ee> - 2022-09-23 12:13 +0300
Re: ???Microsoft Azure CTO Mark Russinovich: C/C++ should be deprecated??? Juha Nieminen <nospam@thanks.invalid> - 2022-09-23 10:01 +0000
Re: ???Microsoft Azure CTO Mark Russinovich: C/C++ should be deprecated??? Michael S <already5chosen@yahoo.com> - 2022-09-23 03:14 -0700
Re: ???Microsoft Azure CTO Mark Russinovich: C/C++ should be deprecated??? Juha Nieminen <nospam@thanks.invalid> - 2022-09-26 08:01 +0000
Re: ???Microsoft Azure CTO Mark Russinovich: C/C++ should be deprecated??? Tim Rentsch <tr.17687@z991.linuxsc.com> - 2022-10-02 12:57 -0700
Re: ???Microsoft Azure CTO Mark Russinovich: C/C++ should be deprecated??? Michael S <already5chosen@yahoo.com> - 2022-10-02 13:53 -0700
Re: ???Microsoft Azure CTO Mark Russinovich: C/C++ should be deprecated??? Tim Rentsch <tr.17687@z991.linuxsc.com> - 2022-10-07 16:00 -0700
Re: ???Microsoft Azure CTO Mark Russinovich: C/C++ should be deprecated??? Michael S <already5chosen@yahoo.com> - 2022-10-08 10:57 -0700
Re: ???Microsoft Azure CTO Mark Russinovich: C/C++ should be deprecated??? Tim Rentsch <tr.17687@z991.linuxsc.com> - 2022-10-09 08:33 -0700
Re: ???Microsoft Azure CTO Mark Russinovich: C/C++ should be deprecated??? Ben Bacarisse <ben.usenet@bsb.me.uk> - 2022-09-23 11:58 +0100
Re: ???Microsoft Azure CTO Mark Russinovich: C/C++ should be deprecated??? Juha Nieminen <nospam@thanks.invalid> - 2022-09-26 08:01 +0000
Re: ???Microsoft Azure CTO Mark Russinovich: C/C++ should be deprecated??? Blue-Maned_Hawk <bluemanedhawk@gmail.com> - 2022-09-26 02:03 -0400
Re: ???Microsoft Azure CTO Mark Russinovich: C/C++ should be deprecated??? David Brown <david.brown@hesbynett.no> - 2022-09-23 13:32 +0200
Re: ???Microsoft Azure CTO Mark Russinovich: C/C++ should be deprecated??? red floyd <no.spam.here@its.invalid> - 2022-09-23 14:43 -0700
Re: ???Microsoft Azure CTO Mark Russinovich: C/C++ should be deprecated??? Juha Nieminen <nospam@thanks.invalid> - 2022-09-23 07:26 +0000
Re: ???Microsoft Azure CTO Mark Russinovich: C/C++ should be deprecated??? Ben Bacarisse <ben.usenet@bsb.me.uk> - 2022-09-23 11:15 +0100
Re: ???Microsoft Azure CTO Mark Russinovich: C/C++ should be deprecated??? Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2022-09-23 12:35 -0700
Re: ???Microsoft Azure CTO Mark Russinovich: C/C++ should be deprecated??? "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2022-09-23 12:44 -0700
Re: ???Microsoft Azure CTO Mark Russinovich: C/C++ should be deprecated??? Juha Nieminen <nospam@thanks.invalid> - 2022-09-26 08:09 +0000
Re: ???Microsoft Azure CTO Mark Russinovich: C/C++ should be deprecated??? Bonita Montero <Bonita.Montero@gmail.com> - 2022-09-24 13:25 +0200
Re: ???Microsoft Azure CTO Mark Russinovich: C/C++ should be deprecated??? Juha Nieminen <nospam@thanks.invalid> - 2022-09-26 08:13 +0000
Re: ???Microsoft Azure CTO Mark Russinovich: C/C++ should be deprecated??? Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2022-09-26 10:44 -0700
Re: ???Microsoft Azure CTO Mark Russinovich: C/C++ should be deprecated??? Juha Nieminen <nospam@thanks.invalid> - 2022-09-27 06:26 +0000
Re: ???Microsoft Azure CTO Mark Russinovich: C/C++ should be deprecated??? Joe Pfeiffer <pfeiffer@cs.nmsu.edu> - 2022-09-27 09:56 -0600
Re: ???Microsoft Azure CTO Mark Russinovich: C/C++ should be deprecated??? Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2022-09-27 10:50 -0700
Re: ???Microsoft Azure CTO Mark Russinovich: C/C++ should be deprecated??? Blue-Maned_Hawk <bluemanedhawk@gmail.com> - 2022-09-26 01:57 -0400
Re: “Microsoft Azure CTO Mark Russinovich: C/C++ should be deprecated” Jens Stuckelberger <Jens_Stuckelberger@nowhere.net> - 2022-09-22 14:01 +0000
Re: “Microsoft Azure CTO Mark Russinovich: C/C++ should be deprecated” Kaz Kylheku <864-117-4973@kylheku.com> - 2022-09-23 03:17 +0000
Re: ???Microsoft Azure CTO Mark Russinovich: C/C++ should be deprecated??? Juha Nieminen <nospam@thanks.invalid> - 2022-09-23 07:50 +0000
Re: ???Microsoft Azure CTO Mark Russinovich: C/C++ should be deprecated??? David Brown <david.brown@hesbynett.no> - 2022-09-23 13:37 +0200
Re: ???Microsoft Azure CTO Mark Russinovich: C/C++ should be deprecated??? Juha Nieminen <nospam@thanks.invalid> - 2022-09-26 08:19 +0000
Re: ???Microsoft Azure CTO Mark Russinovich: C/C++ should be deprecated??? David Brown <david.brown@hesbynett.no> - 2022-09-26 13:55 +0200
Re: ???Microsoft Azure CTO Mark Russinovich: C/C++ should be deprecated??? Juha Nieminen <nospam@thanks.invalid> - 2022-09-26 14:31 +0000
Re: ???Microsoft Azure CTO Mark Russinovich: C/C++ should be deprecated??? Bart <bc@freeuk.com> - 2022-09-26 16:05 +0100
Re: ???Microsoft Azure CTO Mark Russinovich: C/C++ should be deprecated??? Juha Nieminen <nospam@thanks.invalid> - 2022-09-27 06:36 +0000
Re: ???Microsoft Azure CTO Mark Russinovich: C/C++ should be deprecated??? David Brown <david.brown@hesbynett.no> - 2022-09-27 11:21 +0200
Re: ???Microsoft Azure CTO Mark Russinovich: C/C++ should be deprecated??? Juha Nieminen <nospam@thanks.invalid> - 2022-09-27 13:26 +0000
Re: ???Microsoft Azure CTO Mark Russinovich: C/C++ should be deprecated??? Bo Persson <bo@bo-persson.se> - 2022-09-27 16:53 +0200
Re: ???Microsoft Azure CTO Mark Russinovich: C/C++ should be deprecated??? David Brown <david.brown@hesbynett.no> - 2022-09-28 10:32 +0200
Re: ???Microsoft Azure CTO Mark Russinovich: C/C++ should be deprecated??? Kaz Kylheku <864-117-4973@kylheku.com> - 2022-09-27 18:18 +0000
Re: ???Microsoft Azure CTO Mark Russinovich: C/C++ should be deprecated??? James Kuyper <jameskuyper@alumni.caltech.edu> - 2022-09-28 01:30 -0400
Re: ???Microsoft Azure CTO Mark Russinovich: C/C++ should be deprecated??? Kaz Kylheku <864-117-4973@kylheku.com> - 2022-09-28 08:26 +0000
Re: ???Microsoft Azure CTO Mark Russinovich: C/C++ should be deprecated??? Bo Persson <bo@bo-persson.se> - 2022-09-28 10:43 +0200
Re: ???Microsoft Azure CTO Mark Russinovich: C/C++ should be deprecated??? James Kuyper <jameskuyper@alumni.caltech.edu> - 2022-09-28 13:15 -0400
Re: ???Microsoft Azure CTO Mark Russinovich: C/C++ should be deprecated??? Kaz Kylheku <864-117-4973@kylheku.com> - 2022-09-28 23:38 +0000
Re: ???Microsoft Azure CTO Mark Russinovich: C/C++ should be deprecated??? David Brown <david.brown@hesbynett.no> - 2022-09-29 11:46 +0200
Re: ???Microsoft Azure CTO Mark Russinovich: C/C++ should be deprecated??? Kaz Kylheku <864-117-4973@kylheku.com> - 2022-09-29 17:58 +0000
Re: ???Microsoft Azure CTO Mark Russinovich: C/C++ should be deprecated??? David Brown <david.brown@hesbynett.no> - 2022-09-30 09:17 +0200
Re: ???Microsoft Azure CTO Mark Russinovich: C/C++ should be deprecated??? Kaz Kylheku <864-117-4973@kylheku.com> - 2022-09-30 16:39 +0000
Re: ???Microsoft Azure CTO Mark Russinovich: C/C++ should be deprecated??? David Brown <david.brown@hesbynett.no> - 2022-10-01 12:47 +0200
Re: ???Microsoft Azure CTO Mark Russinovich: C/C++ should be deprecated??? Kaz Kylheku <864-117-4973@kylheku.com> - 2022-09-30 17:20 +0000
Re: ???Microsoft Azure CTO Mark Russinovich: C/C++ should be deprecated??? Paavo Helde <eesnimi@osa.pri.ee> - 2022-09-30 20:59 +0300
Re: ???Microsoft Azure CTO Mark Russinovich: C/C++ should be deprecated??? Tim Rentsch <tr.17687@z991.linuxsc.com> - 2022-10-02 07:31 -0700
Re: ???Microsoft Azure CTO Mark Russinovich: C/C++ should be deprecated??? David Brown <david.brown@hesbynett.no> - 2022-10-02 13:38 +0200
Re: ???Microsoft Azure CTO Mark Russinovich: C/C++ should be deprecated??? Ben Bacarisse <ben.usenet@bsb.me.uk> - 2022-10-02 13:00 +0100
Re: ???Microsoft Azure CTO Mark Russinovich: C/C++ should be deprecated??? David Brown <david.brown@hesbynett.no> - 2022-10-02 16:20 +0200
Re: ???Microsoft Azure CTO Mark Russinovich: C/C++ should be deprecated??? Manfred <noname@add.invalid> - 2022-10-02 22:05 +0200
Re: ???Microsoft Azure CTO Mark Russinovich: C/C++ should be deprecated??? David Brown <david.brown@hesbynett.no> - 2022-10-03 11:58 +0200
Re: ???Microsoft Azure CTO Mark Russinovich: C/C++ should be deprecated??? Tim Rentsch <tr.17687@z991.linuxsc.com> - 2022-10-02 07:24 -0700
Re: ???Microsoft Azure CTO Mark Russinovich: C/C++ should be deprecated??? David Brown <david.brown@hesbynett.no> - 2022-09-28 09:40 +0200
Re: ???Microsoft Azure CTO Mark Russinovich: C/C++ should be deprecated??? Richard Damon <Richard@Damon-Family.org> - 2022-09-28 07:56 -0400
Re: ???Microsoft Azure CTO Mark Russinovich: C/C++ should be deprecated??? David Brown <david.brown@hesbynett.no> - 2022-09-28 15:50 +0200
Re: ???Microsoft Azure CTO Mark Russinovich: C/C++ should be deprecated??? scott@slp53.sl.home (Scott Lurndal) - 2022-09-28 14:21 +0000
Re: ???Microsoft Azure CTO Mark Russinovich: C/C++ should be deprecated??? scott@slp53.sl.home (Scott Lurndal) - 2022-09-28 16:17 +0000
Re: ???Microsoft Azure CTO Mark Russinovich: C/C++ should be deprecated??? Kaz Kylheku <864-117-4973@kylheku.com> - 2022-09-28 16:56 +0000
Re: ???Microsoft Azure CTO Mark Russinovich: C/C++ should be deprecated??? Bo Persson <bo@bo-persson.se> - 2022-09-28 20:31 +0200
Re: ???Microsoft Azure CTO Mark Russinovich: C/C++ should be deprecated??? doctor@doctor.nl2k.ab.ca (The Doctor) - 2022-09-28 21:45 +0000
Re: ???Microsoft Azure CTO Mark Russinovich: C/C++ should be deprecated??? David Brown <david.brown@hesbynett.no> - 2022-09-29 11:50 +0200
Re: ???Microsoft Azure CTO Mark Russinovich: C/C++ should be deprecated??? Richard Damon <Richard@Damon-Family.org> - 2022-09-28 19:33 -0400
Re: ???Microsoft Azure CTO Mark Russinovich: C/C++ should be deprecated??? rbowman <bowman@montana.com> - 2022-09-26 09:04 -0600
Re: ???Microsoft Azure CTO Mark Russinovich: C/C++ should be deprecated??? David Brown <david.brown@hesbynett.no> - 2022-09-27 11:27 +0200
Re: ???Microsoft Azure CTO Mark Russinovich: C/C++ should be deprecated??? rbowman <bowman@montana.com> - 2022-09-27 08:11 -0600
Re: ???Microsoft Azure CTO Mark Russinovich: C/C++ should be deprecated??? David Brown <david.brown@hesbynett.no> - 2022-09-27 18:10 +0200
Re: ???Microsoft Azure CTO Mark Russinovich: C/C++ should be deprecated??? rbowman <bowman@montana.com> - 2022-09-27 17:30 -0600
Re: ???Microsoft Azure CTO Mark Russinovich: C/C++ should be deprecated??? Kaz Kylheku <864-117-4973@kylheku.com> - 2022-09-28 00:26 +0000
Re: ???Microsoft Azure CTO Mark Russinovich: C/C++ should be deprecated??? David Brown <david.brown@hesbynett.no> - 2022-09-28 11:00 +0200
Re: ???Microsoft Azure CTO Mark Russinovich: C/C++ should be deprecated??? Ben Bacarisse <ben.usenet@bsb.me.uk> - 2022-09-28 13:33 +0100
Re: ???Microsoft Azure CTO Mark Russinovich: C/C++ should be deprecated??? Manfred <noname@add.invalid> - 2022-09-25 19:31 +0200
Re: ???Microsoft Azure CTO Mark Russinovich: C/C++ should be deprecated??? Kaz Kylheku <864-117-4973@kylheku.com> - 2022-09-26 04:53 +0000
Re: ???Microsoft Azure CTO Mark Russinovich: C/C++ should be deprecated??? Tim Rentsch <tr.17687@z991.linuxsc.com> - 2022-10-02 12:59 -0700
Re: “Microsoft Azure CTO Mark Russinovich: C/C++ should be deprecated” Opus <ifonly@youknew.org> - 2022-09-23 18:32 +0200
Re: “Microsoft Azure CTO Mark Russinovich: C/C++ should be deprecated” Blue-Maned_Hawk <bluemanedhawk@gmail.com> - 2022-09-26 02:08 -0400
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