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| From | glen herrmannsfeldt <gah@ugcs.caltech.edu> |
|---|---|
| Newsgroups | comp.lang.c |
| Subject | Re: Pointers, constant values |
| Date | 2015-10-19 21:20 +0000 |
| Organization | Aioe.org NNTP Server |
| Message-ID | <n03mrg$2ji$1@speranza.aioe.org> (permalink) |
| References | (11 earlier) <n016ml$akq$1@dont-email.me> <87k2qjlm80.fsf@bsb.me.uk> <n02hqs$uif$1@dont-email.me> <871tcrkr8i.fsf@bsb.me.uk> <n02osd$ov4$1@dont-email.me> |
Bartc <bc@freeuk.com> wrote:
(snip)
> But few languages are actually going to pass arrays by value. It is
> generally understood that there will be pointers and
> references involved.
Well, actually you can pass arrays by value in C if you put them
inside a struct.
> C, being lower level, has to specify those explicitly. You /want/ to
> pass a pointer-to-array, it's not second-best to passing a value-array.
> And you want to keep the pointer-to-array at the other end. C has the
> data-types to express a pointer-to-array, but it doesn't make it easy to
> use them.
I haven't looked at any actual implementation. As far as I know,
following the "as-if" rule, an implementation could pass an address
or pointer if the callee made a local copy and didn't copy back.
Note that this might cause some C program to fail, that make
assumptions on how pass by value works:
printf("%08x%08x", 1.234);
don't do that.
-- glen
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Pointers, constant values Alla _ <modelling.data@gmail.com> - 2015-10-16 00:49 -0700
Re: Pointers, constant values Philip Lantz <prl@canterey.us> - 2015-10-16 01:49 -0700
Re: Pointers, constant values James Kuyper <jameskuyper@verizon.net> - 2015-10-16 09:41 -0400
Re: Pointers, constant values supercat@casperkitty.com - 2015-10-16 08:55 -0700
Re: Pointers, constant values Keith Thompson <kst-u@mib.org> - 2015-10-16 08:25 -0700
Re: Pointers, constant values supercat@casperkitty.com - 2015-10-16 09:11 -0700
Re: Pointers, constant values Keith Thompson <kst-u@mib.org> - 2015-10-16 12:06 -0700
Re: Pointers, constant values supercat@casperkitty.com - 2015-10-16 12:55 -0700
Re: Pointers, constant values Bartc <bc@freeuk.com> - 2015-10-16 17:49 +0100
Re: Pointers, constant values Lew Pitcher <lew.pitcher@digitalfreehold.ca> - 2015-10-16 13:23 -0400
Re: Pointers, constant values Bartc <bc@freeuk.com> - 2015-10-16 19:34 +0100
Re: Pointers, constant values supercat@casperkitty.com - 2015-10-16 12:05 -0700
Re: Pointers, constant values Keith Thompson <kst-u@mib.org> - 2015-10-16 12:18 -0700
Re: Pointers, constant values Keith Thompson <kst-u@mib.org> - 2015-10-16 12:13 -0700
Re: Pointers, constant values Bartc <bc@freeuk.com> - 2015-10-16 20:33 +0100
Re: Pointers, constant values Keith Thompson <kst-u@mib.org> - 2015-10-16 13:01 -0700
Re: Pointers, constant values Bartc <bc@freeuk.com> - 2015-10-16 21:09 +0100
Re: Pointers, constant values Keith Thompson <kst-u@mib.org> - 2015-10-16 13:41 -0700
Re: Pointers, constant values Ben Bacarisse <ben.usenet@bsb.me.uk> - 2015-10-16 21:07 +0100
Re: Pointers, constant values Bartc <bc@freeuk.com> - 2015-10-16 21:20 +0100
Re: Pointers, constant values Ben Bacarisse <ben.usenet@bsb.me.uk> - 2015-10-16 22:02 +0100
Re: Pointers, constant values Bartc <bc@freeuk.com> - 2015-10-16 22:21 +0100
Re: Pointers, constant values supercat@casperkitty.com - 2015-10-16 14:39 -0700
Re: Pointers, constant values Keith Thompson <kst-u@mib.org> - 2015-10-16 15:26 -0700
Re: Pointers, constant values supercat@casperkitty.com - 2015-10-16 15:44 -0700
Re: Pointers, constant values Keith Thompson <kst-u@mib.org> - 2015-10-16 16:58 -0700
Re: Pointers, constant values supercat@casperkitty.com - 2015-10-16 17:28 -0700
Re: Pointers, constant values Ben Bacarisse <ben.usenet@bsb.me.uk> - 2015-10-16 22:50 +0100
Re: Pointers, constant values supercat@casperkitty.com - 2015-10-16 15:14 -0700
Re: Pointers, constant values Bartc <bc@freeuk.com> - 2015-10-17 01:23 +0100
Re: Pointers, constant values Ben Bacarisse <ben.usenet@bsb.me.uk> - 2015-10-17 19:39 +0100
Re: Pointers, constant values Bartc <bc@freeuk.com> - 2015-10-17 22:42 +0100
Re: Pointers, constant values Ben Bacarisse <ben.usenet@bsb.me.uk> - 2015-10-18 00:31 +0100
Re: Pointers, constant values Bartc <bc@freeuk.com> - 2015-10-18 02:11 +0100
Re: Pointers, constant values Ben Bacarisse <ben.usenet@bsb.me.uk> - 2015-10-18 11:59 +0100
Re: Pointers, constant values Bartc <bc@freeuk.com> - 2015-10-18 12:12 +0100
Re: Pointers, constant values Bartc <bc@freeuk.com> - 2015-10-18 12:28 +0100
Re: Pointers, constant values Ben Bacarisse <ben.usenet@bsb.me.uk> - 2015-10-18 23:16 +0100
Re: Pointers, constant values Bartc <bc@freeuk.com> - 2015-10-18 23:34 +0100
Re: Pointers, constant values Ben Bacarisse <ben.usenet@bsb.me.uk> - 2015-10-19 01:45 +0100
Re: Pointers, constant values Bartc <bc@freeuk.com> - 2015-10-19 11:51 +0100
Re: Pointers, constant values Ben Bacarisse <ben.usenet@bsb.me.uk> - 2015-10-19 12:55 +0100
Re: Pointers, constant values Bartc <bc@freeuk.com> - 2015-10-19 13:51 +0100
Re: Pointers, constant values Malcolm McLean <malcolm.mclean5@btinternet.com> - 2015-10-19 06:02 -0700
Re: Pointers, constant values supercat@casperkitty.com - 2015-10-19 07:02 -0700
Re: Pointers, constant values Bartc <bc@freeuk.com> - 2015-10-19 15:39 +0100
Re: Pointers, constant values supercat@casperkitty.com - 2015-10-19 08:54 -0700
Re: Pointers, constant values Malcolm McLean <malcolm.mclean5@btinternet.com> - 2015-10-19 09:14 -0700
Re: Pointers, constant values supercat@casperkitty.com - 2015-10-19 10:21 -0700
Re: Pointers, constant values Malcolm McLean <malcolm.mclean5@btinternet.com> - 2015-10-19 12:57 -0700
Re: Pointers, constant values glen herrmannsfeldt <gah@ugcs.caltech.edu> - 2015-10-19 21:20 +0000
Re: Pointers, constant values supercat@casperkitty.com - 2015-10-20 20:50 -0700
Re: Pointers, constant values glen herrmannsfeldt <gah@ugcs.caltech.edu> - 2015-10-21 04:58 +0000
Re: Pointers, constant values Keith Thompson <kst-u@mib.org> - 2015-10-19 08:40 -0700
Re: Pointers, constant values Ben Bacarisse <ben.usenet@bsb.me.uk> - 2015-10-19 20:17 +0100
Re: Pointers, constant values supercat@casperkitty.com - 2015-10-17 16:44 -0700
Re: Pointers, constant values Ben Bacarisse <ben.usenet@bsb.me.uk> - 2015-10-18 11:52 +0100
Re: Pointers, constant values Malcolm McLean <malcolm.mclean5@btinternet.com> - 2015-10-18 05:15 -0700
Re: Pointers, constant values Ben Bacarisse <ben.usenet@bsb.me.uk> - 2015-10-18 21:54 +0100
Re: Pointers, constant values Malcolm McLean <malcolm.mclean5@btinternet.com> - 2015-10-18 16:09 -0700
Re: Pointers, constant values supercat@casperkitty.com - 2015-10-18 07:55 -0700
Re: Pointers, constant values Ben Bacarisse <ben.usenet@bsb.me.uk> - 2015-10-18 21:47 +0100
Re: Pointers, constant values supercat@casperkitty.com - 2015-10-18 15:37 -0700
Re: Pointers, constant values Ben Bacarisse <ben.usenet@bsb.me.uk> - 2015-10-19 00:10 +0100
Re: Pointers, constant values supercat@casperkitty.com - 2015-10-18 19:04 -0700
Re: Pointers, constant values Ben Bacarisse <ben.usenet@bsb.me.uk> - 2015-10-16 21:13 +0100
Re: Pointers, constant values Ian Collins <ian-news@hotmail.com> - 2015-10-17 11:27 +1300
Re: Pointers, constant values Bartc <bc@freeuk.com> - 2015-10-17 00:56 +0100
Re: Pointers, constant values Les Cargill <lcargill99@comcast.com> - 2015-10-16 12:37 -0500
Re: Pointers, constant values James Kuyper <jameskuyper@verizon.net> - 2015-10-16 14:22 -0400
Re: Pointers, constant values Jorgen Grahn <grahn+nntp@snipabacken.se> - 2015-10-16 18:57 +0000
Re: Pointers, constant values Ben Bacarisse <ben.usenet@bsb.me.uk> - 2015-10-16 20:40 +0100
Re: Pointers, constant values Jorgen Grahn <grahn+nntp@snipabacken.se> - 2015-10-16 20:46 +0000
Re: Pointers, constant values Keith Thompson <kst-u@mib.org> - 2015-10-16 14:24 -0700
Re: Pointers, constant values Jorgen Grahn <grahn+nntp@snipabacken.se> - 2015-10-19 12:43 +0000
Re: Pointers, constant values Siri Cruz <chine.bleu@yahoo.com> - 2015-10-16 13:20 -0700
Re: Pointers, constant values supercat@casperkitty.com - 2015-10-17 13:59 -0700
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