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| From | Keith Thompson <kst-u@mib.org> |
|---|---|
| Newsgroups | comp.lang.c |
| Subject | Re: ->= |
| Date | 2015-11-27 19:37 -0800 |
| Organization | None to speak of |
| Message-ID | <lnvb8myetj.fsf@kst-u.example.com> (permalink) |
| References | <n34i16$puk$1@speranza.aioe.org> <kfn7fl3ytq6.fsf@x-alumni2.alumni.caltech.edu> <cf4e364d-de82-449a-bc76-deb580136a79@googlegroups.com> <n3apdj$r7u$1@dont-email.me> |
BartC <bc@freeuk.com> writes:
[...]
>> On Friday, November 27, 2015 at 4:15:37 PM UTC-6, Tim Rentsch wrote:
[...]
> >> best it's no more than syntactic saccharin. Note also it
> >> requires revising the rule stated in the first sentence of
> >> 6.5.16.2 p3. Kind of sticks out like a sort thumb.
>
> I didn't understand that bit. But I can see that if a member name
> normally only follows a "." or "->" token, now it will need to be
> allowed after "->=" too. It can't just be mapped to = and ->, unless the
> implementation ensures that any side-effects occur just once.
6.5.16.2p3 says:
A compound assignment of the form E1 op = E2 is equivalent to
the simple assignment expression E1 = E1 op (E2), except that
the lvalue E1 is evaluated only once, and with respect to an
indeterminately-sequenced function call, the operation of a
compound assignment is a single evaluation.
The semantics of the `->=` operator would have to be defined
without the parentheses, since `foo->(bar)` is illegal even when
`foo->bar` is legal. Not a fatal problem, but it would be one more
special case.
(Tim: I suggest that you'd save a some people some time if you'd quote
the sentence rather than just citing the section and paragraph number.)
--
Keith Thompson (The_Other_Keith) kst-u@mib.org <http://www.ghoti.net/~kst>
Working, but not speaking, for JetHead Development, Inc.
"We must do something. This is something. Therefore, we must do this."
-- Antony Jay and Jonathan Lynn, "Yes Minister"
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->= glen herrmannsfeldt <gah@ugcs.caltech.edu> - 2015-11-25 14:53 +0000
Re: ->= Richard Heathfield <rjh@cpax.org.uk> - 2015-11-25 15:12 +0000
Re: ->= James Kuyper <jameskuyper@verizon.net> - 2015-11-25 11:51 -0500
Re: ->= "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2015-11-25 09:49 -0800
Re: ->= supercat@casperkitty.com - 2015-11-25 09:55 -0800
Re: ->= John Bode <jfbode1029@gmail.com> - 2015-11-25 12:24 -0800
Re: ->= James Kuyper <jameskuyper@verizon.net> - 2015-11-25 15:40 -0500
Re: ->= John Bode <jfbode1029@gmail.com> - 2015-11-27 17:14 -0800
Re: ->= James Kuyper <jameskuyper@verizon.net> - 2015-11-27 20:28 -0500
Re: ->= "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2015-11-25 07:35 -0800
Re: ->= "Charles Richmond" <numerist@aquaporin4.com> - 2015-11-25 15:47 -0600
Re: ->= James Kuyper <jameskuyper@verizon.net> - 2015-11-25 17:04 -0500
Re: ->= Nobody <nobody@nowhere.invalid> - 2015-11-26 10:58 +0000
Re: ->= supercat@casperkitty.com - 2015-11-26 08:55 -0800
Re: ->= raltbos@xs4all.nl (Richard Bos) - 2015-11-26 00:48 +0000
Re: ->= Tim Rentsch <txr@alumni.caltech.edu> - 2015-11-27 14:15 -0800
Re: ->= supercat@casperkitty.com - 2015-11-27 14:26 -0800
Re: ->= BartC <bc@freeuk.com> - 2015-11-27 23:38 +0000
Re: ->= Keith Thompson <kst-u@mib.org> - 2015-11-27 19:37 -0800
Re: ->= Tim Rentsch <txr@alumni.caltech.edu> - 2015-11-28 06:35 -0800
Re: ->= Stephen Sprunk <stephen@sprunk.org> - 2015-11-27 17:51 -0600
Re: ->= Tim Rentsch <txr@alumni.caltech.edu> - 2015-11-28 06:53 -0800
Re: ->= glen herrmannsfeldt <gah@ugcs.caltech.edu> - 2015-11-28 17:12 +0000
Re: ->= Keith Thompson <kst-u@mib.org> - 2015-11-28 10:26 -0800
Re: ->= glen herrmannsfeldt <gah@ugcs.caltech.edu> - 2015-11-28 19:50 +0000
Re: ->= BartC <bc@freeuk.com> - 2015-11-28 19:14 +0000
Re: ->= supercat@casperkitty.com - 2015-11-28 11:48 -0800
Re: ->= glen herrmannsfeldt <gah@ugcs.caltech.edu> - 2015-11-29 22:33 +0000
Re: ->= glen herrmannsfeldt <gah@ugcs.caltech.edu> - 2015-11-28 20:18 +0000
Re: ->= Stephen Sprunk <stephen@sprunk.org> - 2015-11-28 18:15 -0600
Re: ->= glen herrmannsfeldt <gah@ugcs.caltech.edu> - 2015-11-29 22:44 +0000
Re: ->= Stephen Sprunk <stephen@sprunk.org> - 2015-11-29 18:25 -0600
Re: ->= raltbos@xs4all.nl (Richard Bos) - 2015-11-30 10:21 +0000
Re: ->= Keith Thompson <kst-u@mib.org> - 2015-11-28 13:10 -0800
Re: ->= BartC <bc@freeuk.com> - 2015-11-28 22:12 +0000
Re: ->= raltbos@xs4all.nl (Richard Bos) - 2015-11-29 11:42 +0000
Re: ->= BartC <bc@freeuk.com> - 2015-11-29 14:24 +0000
Re: "->=" Eric Sosman <esosman@comcast-dot-net.invalid> - 2015-11-29 10:33 -0500
Re: "->=" BartC <bc@freeuk.com> - 2015-11-29 17:49 +0000
Re: ->= supercat@casperkitty.com - 2015-11-29 11:50 -0800
Re: ->= BartC <bc@freeuk.com> - 2015-11-29 22:37 +0000
Re: ->= Keith Thompson <kst-u@mib.org> - 2015-11-30 00:23 -0800
Re: ->= glen herrmannsfeldt <gah@ugcs.caltech.edu> - 2015-11-29 23:00 +0000
Re: ->= Keith Thompson <kst-u@mib.org> - 2015-11-30 00:28 -0800
Re: ->= Rosario19 <Ros@invalid.invalid> - 2015-12-13 16:29 +0100
Re: ->= Eric Sosman <esosman@comcast-dot-net.invalid> - 2015-11-28 14:59 -0500
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