Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]
| From | Martin Shobe <martin.shobe@yahoo.com> |
|---|---|
| Newsgroups | comp.lang.c |
| Subject | Re: counting bytes |
| Date | 2015-07-11 13:54 -0500 |
| Organization | A noiseless patient Spider |
| Message-ID | <mnrona$m3o$1@dont-email.me> (permalink) |
| References | (5 earlier) <ml1h2m$1dc$1@dont-email.me> <87eglns3jc.fsf@kst-u.example.com> <ml2bjj$5jb$1@dont-email.me> <ml2cae$832$1@dont-email.me> <kfn4mlazpn0.fsf@x-alumni2.alumni.caltech.edu> |
On 7/11/2015 10:21 AM, Tim Rentsch wrote: > Richard Heathfield <rjh@cpax.org.uk> writes: > >> On 07/06/15 22:05, David Brown wrote: >> >> <snip> >> >>> * I believe there may be a theoretical opening in the standards for an >>> architecture that has CHAR_BIT not equal to 8 and yet still has a >>> uint8_t type. But I am certain that I will never be using such a system. >> >> CHAR_BIT is guaranteed to be *at least* 8. If it is not 8, it must be >> greater than 8. >> >> The sizeof operator yields a size_t, which is the size (in bytes) of >> its operand, and size_t has an unsigned integer type, which means that >> it cannot represent fractional sizes. >> >> Since int8_t denotes a signed integer type with *exactly* 8 bits (see >> 7.20.1.1(1), which makes this crystal clear), on a system with >> CHAR_BIT greater than 8, it would have to have a fractional size. >> >> Since the sizeof operator is both (a) required to yield the size in >> bytes of its operand, and (b) unable to yield the size of an int8_t on >> a system with CHAR_BIT > 8, we have a contradiction. I deduce that >> such an implementation would not be conforming. > > The flaw in your argument is the assertion that integer types > cannot reprepresent fractional values. It is of course possible > for integer types to represent fractional values, floating-point > values, irrational values, transcendental values, or almost any > other kind of values you can think of, by using padding bits and > trap representations. > > It is possible to have a conforming implementation with > CHAR_BIT > 8 but still having a type that occupies only eight > bits. AFAIK there is no reason such an implementation > could not use that type to provide the [u]int8_t types. I suppose we could if we ignored the requirement that they have no padding bits. Martin Shobe
Back to comp.lang.c | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread
counting bytes bilsch01 <king621@comcast.net> - 2015-06-06 04:58 -0700
Re: counting bytes Bartc <bc@freeuk.com> - 2015-06-06 13:05 +0100
Re: counting bytes bilsch01 <king621@comcast.net> - 2015-06-06 05:24 -0700
Re: counting bytes Malcolm McLean <malcolm.mclean5@btinternet.com> - 2015-06-06 05:41 -0700
Re: counting bytes Ben Bacarisse <ben.usenet@bsb.me.uk> - 2015-06-06 14:00 +0100
Re: counting bytes Bartc <bc@freeuk.com> - 2015-06-06 13:52 +0100
Re: counting bytes Lew Pitcher <lew.pitcher@digitalfreehold.ca> - 2015-06-06 10:27 -0400
Re: counting bytes jt@toerring.de (Jens Thoms Toerring) - 2015-06-06 22:31 +0000
THANKS EVERYBODY FOR THE INFO bilsch01 <king621@comcast.net> - 2015-06-06 23:35 -0700
Re: THANKS EVERYBODY FOR THE INFO Ben Bacarisse <ben.usenet@bsb.me.uk> - 2015-06-07 10:08 +0100
Re: THANKS EVERYBODY FOR THE INFO Malcolm McLean <malcolm.mclean5@btinternet.com> - 2015-06-07 09:22 -0700
Re: THANKS EVERYBODY FOR THE INFO Ben Bacarisse <ben.usenet@bsb.me.uk> - 2015-06-07 18:07 +0100
Re: THANKS EVERYBODY FOR THE INFO Malcolm McLean <malcolm.mclean5@btinternet.com> - 2015-06-08 04:03 -0700
Re: THANKS EVERYBODY FOR THE INFO Tim Rentsch <txr@alumni.caltech.edu> - 2015-07-11 08:12 -0700
Re: THANKS EVERYBODY FOR THE INFO Keith Thompson <kst-u@mib.org> - 2015-06-07 08:01 -0700
Re: counting bytes gordonb.3gcai@burditt.org (Gordon Burditt) - 2015-06-07 05:02 -0500
Re: counting bytes David Brown <david.brown@hesbynett.no> - 2015-06-07 15:32 +0200
Re: counting bytes Keith Thompson <kst-u@mib.org> - 2015-06-07 12:48 -0700
Re: counting bytes David Brown <david.brown@hesbynett.no> - 2015-06-07 23:05 +0200
Re: counting bytes Richard Heathfield <rjh@cpax.org.uk> - 2015-06-07 22:17 +0100
Re: counting bytes David Brown <david.brown@hesbynett.no> - 2015-06-07 23:49 +0200
Re: counting bytes Richard Heathfield <rjh@cpax.org.uk> - 2015-06-07 23:37 +0100
Re: counting bytes Tim Rentsch <txr@alumni.caltech.edu> - 2015-07-11 08:25 -0700
Re: counting bytes Tim Rentsch <txr@alumni.caltech.edu> - 2015-07-11 08:21 -0700
Re: counting bytes Martin Shobe <martin.shobe@yahoo.com> - 2015-07-11 13:54 -0500
Re: counting bytes Tim Rentsch <txr@alumni.caltech.edu> - 2015-07-20 06:33 -0700
Re: counting bytes Martin Shobe <martin.shobe@yahoo.com> - 2015-07-20 09:51 -0500
Re: counting bytes Tim Rentsch <txr@alumni.caltech.edu> - 2015-07-24 09:49 -0700
Re: counting bytes Martin Shobe <martin.shobe@yahoo.com> - 2015-07-24 12:26 -0500
Re: counting bytes Tim Rentsch <txr@alumni.caltech.edu> - 2015-07-30 11:16 -0700
Re: counting bytes Martin Shobe <martin.shobe@yahoo.com> - 2015-07-30 23:15 -0500
Re: counting bytes Tim Rentsch <txr@alumni.caltech.edu> - 2015-08-02 06:07 -0700
Re: counting bytes Richard Damon <Richard@Damon-Family.org> - 2015-08-02 14:31 -0400
Re: counting bytes Tim Rentsch <txr@alumni.caltech.edu> - 2015-08-09 05:31 -0700
Re: counting bytes Richard Damon <Richard@Damon-Family.org> - 2015-08-09 17:09 -0400
Re: counting bytes Tim Rentsch <txr@alumni.caltech.edu> - 2015-09-05 09:58 -0700
Re: counting bytes Keith Thompson <kst-u@mib.org> - 2015-09-05 19:29 -0700
Re: counting bytes Tim Rentsch <txr@alumni.caltech.edu> - 2015-09-06 14:38 -0700
Re: counting bytes Keith Thompson <kst-u@mib.org> - 2015-09-06 17:46 -0700
Re: counting bytes Tim Rentsch <txr@alumni.caltech.edu> - 2015-09-07 23:50 -0700
Re: counting bytes Richard Damon <Richard@Damon-Family.org> - 2015-09-06 22:00 -0400
Re: counting bytes Tim Rentsch <txr@alumni.caltech.edu> - 2015-09-07 23:24 -0700
Re: counting bytes Richard Damon <Richard@Damon-Family.org> - 2015-07-24 20:03 -0400
Re: counting bytes Martin Shobe <martin.shobe@yahoo.com> - 2015-07-24 22:13 -0500
Re: counting bytes Malcolm McLean <malcolm.mclean5@btinternet.com> - 2015-07-25 02:22 -0700
Re: counting bytes Martin Shobe <martin.shobe@yahoo.com> - 2015-07-25 11:39 -0500
Re: counting bytes Malcolm McLean <malcolm.mclean5@btinternet.com> - 2015-07-25 09:48 -0700
Re: counting bytes Martin Shobe <martin.shobe@yahoo.com> - 2015-07-25 14:04 -0500
Re: counting bytes Malcolm McLean <malcolm.mclean5@btinternet.com> - 2015-07-25 14:22 -0700
Re: counting bytes Richard Damon <Richard@Damon-Family.org> - 2015-07-25 11:07 -0400
Re: counting bytes James Kuyper <jameskuyper@verizon.net> - 2015-07-25 12:43 -0400
Re: counting bytes Richard Damon <Richard@Damon-Family.org> - 2015-07-25 13:32 -0400
Re: counting bytes glen herrmannsfeldt <gah@ugcs.caltech.edu> - 2015-07-25 20:14 +0000
Re: counting bytes James Kuyper <jameskuyper@verizon.net> - 2015-07-25 17:24 -0400
Re: counting bytes Malcolm McLean <malcolm.mclean5@btinternet.com> - 2015-07-25 14:42 -0700
Re: counting bytes glen herrmannsfeldt <gah@ugcs.caltech.edu> - 2015-07-25 23:02 +0000
Re: counting bytes James Kuyper <jameskuyper@verizon.net> - 2015-07-25 19:17 -0400
Re: counting bytes Malcolm McLean <malcolm.mclean5@btinternet.com> - 2015-07-25 16:37 -0700
Re: counting bytes glen herrmannsfeldt <gah@ugcs.caltech.edu> - 2015-07-26 06:10 +0000
Re: counting bytes James Kuyper <jameskuyper@verizon.net> - 2015-07-26 08:31 -0400
Re: counting bytes Bartc <bc@freeuk.com> - 2015-07-30 21:32 +0100
Re: counting bytes raltbos@xs4all.nl (Richard Bos) - 2015-07-31 13:25 +0000
Re: counting bytes James Kuyper <jameskuyper@verizon.net> - 2015-07-31 11:31 -0400
Re: counting bytes Keith Thompson <kst-u@mib.org> - 2015-07-31 11:30 -0700
Re: counting bytes James Kuyper <jameskuyper@verizon.net> - 2015-07-31 14:29 -0400
Re: counting bytes Keith Thompson <kst-u@mib.org> - 2015-07-31 12:14 -0700
Re: counting bytes David Kleinecke <dkleinecke@gmail.com> - 2015-07-31 17:39 -0700
Re: counting bytes James Kuyper <jameskuyper@verizon.net> - 2015-07-31 23:32 -0400
Re: counting bytes David Kleinecke <dkleinecke@gmail.com> - 2015-08-01 16:41 -0700
Re: counting bytes James Kuyper <jameskuyper@verizon.net> - 2015-08-01 20:23 -0400
Re: counting bytes Malcolm McLean <malcolm.mclean5@btinternet.com> - 2015-07-31 11:01 -0700
Re: counting bytes Richard Damon <Richard@Damon-Family.org> - 2015-07-25 19:42 -0400
Re: counting bytes Tim Rentsch <txr@alumni.caltech.edu> - 2015-07-30 12:16 -0700
Re: counting bytes Bartc <bc@freeuk.com> - 2015-07-30 22:04 +0100
Re: counting bytes Tim Rentsch <txr@alumni.caltech.edu> - 2015-08-02 06:10 -0700
Re: counting bytes David Kleinecke <dkleinecke@gmail.com> - 2015-07-25 19:10 -0700
Re: counting bytes Richard Damon <Richard@Damon-Family.org> - 2015-07-25 22:16 -0400
Re: counting bytes David Kleinecke <dkleinecke@gmail.com> - 2015-07-25 19:46 -0700
Re: counting bytes Tim Rentsch <txr@alumni.caltech.edu> - 2015-07-30 11:52 -0700
Re: counting bytes raltbos@xs4all.nl (Richard Bos) - 2015-07-31 08:51 +0000
Re: counting bytes Tim Rentsch <txr@alumni.caltech.edu> - 2015-08-02 06:19 -0700
Re: counting bytes Richard Damon <Richard@Damon-Family.org> - 2015-08-01 09:39 -0400
Re: counting bytes Keith Thompson <kst-u@mib.org> - 2015-08-01 13:06 -0700
Re: counting bytes Richard Damon <Richard@Damon-Family.org> - 2015-08-01 20:43 -0400
Re: counting bytes Tim Rentsch <txr@alumni.caltech.edu> - 2015-08-02 06:52 -0700
Re: counting bytes Richard Damon <Richard@Damon-Family.org> - 2015-08-02 15:14 -0400
Re: counting bytes Tim Rentsch <txr@alumni.caltech.edu> - 2015-08-09 07:54 -0700
Re: counting bytes Richard Damon <Richard@Damon-Family.org> - 2015-08-09 16:43 -0400
Re: counting bytes Tim Rentsch <txr@alumni.caltech.edu> - 2015-09-05 10:48 -0700
Re: counting bytes Richard Damon <Richard@Damon-Family.org> - 2015-07-11 17:50 -0400
Re: counting bytes Tim Rentsch <txr@alumni.caltech.edu> - 2015-07-20 06:36 -0700
Re: counting bytes raltbos@xs4all.nl (Richard Bos) - 2015-07-20 15:14 +0000
Re: counting bytes Tim Rentsch <txr@alumni.caltech.edu> - 2015-07-24 09:38 -0700
Re: counting bytes raltbos@xs4all.nl (Richard Bos) - 2015-07-25 19:12 +0000
Re: counting bytes Tim Rentsch <txr@alumni.caltech.edu> - 2015-07-30 12:18 -0700
Re: counting bytes Keith Thompson <kst-u@mib.org> - 2015-07-11 17:03 -0700
Re: counting bytes glen herrmannsfeldt <gah@ugcs.caltech.edu> - 2015-07-12 00:15 +0000
Re: counting bytes Keith Thompson <kst-u@mib.org> - 2015-07-11 17:42 -0700
Re: counting bytes glen herrmannsfeldt <gah@ugcs.caltech.edu> - 2015-07-12 02:46 +0000
Re: counting bytes James Kuyper <jameskuyper@verizon.net> - 2015-07-12 12:33 -0400
Re: counting bytes Tim Rentsch <txr@alumni.caltech.edu> - 2015-07-20 06:48 -0700
Re: counting bytes Keith Thompson <kst-u@mib.org> - 2015-07-20 11:18 -0700
Re: counting bytes Tim Rentsch <txr@alumni.caltech.edu> - 2015-07-24 09:58 -0700
Re: counting bytes Keith Thompson <kst-u@mib.org> - 2015-07-24 11:14 -0700
Re: counting bytes Tim Rentsch <txr@alumni.caltech.edu> - 2015-07-30 11:02 -0700
Re: counting bytes Keith Thompson <kst-u@mib.org> - 2015-07-30 13:10 -0700
Re: counting bytes Tim Rentsch <txr@alumni.caltech.edu> - 2015-08-01 10:53 -0700
Re: counting bytes Keith Thompson <kst-u@mib.org> - 2015-06-07 14:46 -0700
Re: counting bytes David Brown <david.brown@hesbynett.no> - 2015-06-08 09:05 +0200
Re: counting bytes Siri Cruz <chine.bleu@yahoo.com> - 2015-06-06 05:06 -0700
Re: counting bytes bartekltg <bartekltg@gmail.com> - 2015-07-26 00:58 +0200
Re: counting bytes bartekltg <bartekltg@gmail.com> - 2015-07-26 01:00 +0200
csiph-web