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Groups > comp.lang.c++ > #69939
| Newsgroups | comp.lang.c++ |
|---|---|
| Date | 2019-11-20 16:27 -0800 |
| References | <qr4275$hk3$1@dont-email.me> <slrnqtb59a.2ntj.grahn+nntp@frailea.sa.invalid> <qr4jnj$oaj$1@dont-email.me> |
| Message-ID | <ac7f7439-e44b-4fdf-935c-bcde74a09ce5@googlegroups.com> (permalink) |
| Subject | Re: [QT creator on "nix"] - getting a strict 8 bit (1 byte) array with no padding |
| From | Öö Tiib <ootiib@hot.ee> |
On Thursday, 21 November 2019 01:54:39 UTC+2, Soviet_Mario wrote: > Il 20/11/19 20:34, Jorgen Grahn ha scritto: > > > > No; a char is rarely more than 8 bits nowadays. You may be thinking > > of wchar_t, but that's something different. > > ok, note taken. But is it a warranty or a very common guess ? Use std::uint8_t from <cstdint> or uint8_t from <stdint.h> anyway just to document what you do. Both must be only present when the platform supports 8 bit unsigned integers. I don't know existence of any platforms with conforming C++ compilers that do not support those or where those are not unsigned char but so what? > > Now I'm exploring the solution with a struct containing only > a 8 bit field, and the #pragma pack An uint8_t directly or wrapped into struct feels better. Your unsigned bitfield in anonymous union in packed struct is possibly not very well tested / profiled in all situations on all compilers and so may have odd differences of performance or the like.
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[QT creator on "nix"] - getting a strict 8 bit (1 byte) array with no padding Soviet_Mario <SovietMario@CCCP.MIR> - 2019-11-20 19:55 +0100
Re: [QT creator on "nix"] - getting a strict 8 bit (1 byte) array with no padding Soviet_Mario <SovietMario@CCCP.MIR> - 2019-11-20 20:12 +0100
Re: [QT creator on "nix"] - getting a strict 8 bit (1 byte) array with no padding Keith Thompson <kst-u@mib.org> - 2019-11-20 22:33 -0800
Re: [QT creator on "nix"] - getting a strict 8 bit (1 byte) array with no padding Soviet_Mario <SovietMario@CCCP.MIR> - 2019-11-20 20:22 +0100
Re: [QT creator on "nix"] - getting a strict 8 bit (1 byte) array with no padding Jorgen Grahn <grahn+nntp@snipabacken.se> - 2019-11-20 19:34 +0000
Re: [QT creator on "nix"] - getting a strict 8 bit (1 byte) array with no padding Soviet_Mario <SovietMario@CCCP.MIR> - 2019-11-21 00:54 +0100
Re: [QT creator on "nix"] - getting a strict 8 bit (1 byte) array with no padding Öö Tiib <ootiib@hot.ee> - 2019-11-20 16:27 -0800
Re: [QT creator on "nix"] - getting a strict 8 bit (1 byte) array with no padding Manfred <invalid@add.invalid> - 2019-11-21 01:48 +0100
Re: [QT creator on "nix"] - getting a strict 8 bit (1 byte) array with no padding Soviet_Mario <SovietMario@CCCP.MIR> - 2019-11-21 04:09 +0100
Re: [QT creator on "nix"] - getting a strict 8 bit (1 byte) array with no padding James Kuyper <jameskuyper@alumni.caltech.edu> - 2019-11-20 17:44 -0800
Re: [QT creator on "nix"] - getting a strict 8 bit (1 byte) array with no padding Soviet_Mario <SovietMario@CCCP.MIR> - 2019-11-21 04:14 +0100
Re: [QT creator on "nix"] - getting a strict 8 bit (1 byte) array with no padding David Brown <david.brown@hesbynett.no> - 2019-11-20 22:03 +0100
Re: [QT creator on "nix"] - getting a strict 8 bit (1 byte) array with no padding Soviet_Mario <SovietMario@CCCP.MIR> - 2019-11-21 01:00 +0100
Re: [QT creator on "nix"] - getting a strict 8 bit (1 byte) array with no padding David Brown <david.brown@hesbynett.no> - 2019-11-21 13:22 +0100
Re: [QT creator on "nix"] - getting a strict 8 bit (1 byte) array with no padding Keith Thompson <kst-u@mib.org> - 2019-11-21 11:30 -0800
Re: [QT creator on "nix"] - getting a strict 8 bit (1 byte) array with no padding David Brown <david.brown@hesbynett.no> - 2019-11-21 22:54 +0100
Re: [QT creator on "nix"] - getting a strict 8 bit (1 byte) array with no padding Paavo Helde <myfirstname@osa.pri.ee> - 2019-11-20 23:28 +0200
Re: [QT creator on "nix"] - getting a strict 8 bit (1 byte) array with no padding James Kuyper <jameskuyper@alumni.caltech.edu> - 2019-11-20 15:48 -0800
Re: [QT creator on "nix"] - getting a strict 8 bit (1 byte) array with no padding Reinhardt Behm <rbehm@hushmail.com> - 2019-11-21 10:33 +0800
Re: [QT creator on "nix"] - getting a strict 8 bit (1 byte) array with no padding David Brown <david.brown@hesbynett.no> - 2019-11-21 13:25 +0100
Re: [QT creator on "nix"] - getting a strict 8 bit (1 byte) array with no padding Keith Thompson <kst-u@mib.org> - 2019-11-20 22:32 -0800
Re: [QT creator on "nix"] - getting a strict 8 bit (1 byte) array with no padding Keith Thompson <kst-u@mib.org> - 2019-11-20 22:43 -0800
Re: [QT creator on "nix"] - getting a strict 8 bit (1 byte) array with no padding Soviet_Mario <SovietMario@CCCP.MIR> - 2019-11-21 12:53 +0100
Re: [QT creator on "nix"] - getting a strict 8 bit (1 byte) array with no padding Paavo Helde <myfirstname@osa.pri.ee> - 2019-11-21 18:20 +0200
Re: [QT creator on "nix"] - getting a strict 8 bit (1 byte) array with no padding Soviet_Mario <SovietMario@CCCP.MIR> - 2019-11-21 18:07 +0100
Re: [QT creator on "nix"] - getting a strict 8 bit (1 byte) array with no padding Mr Flibble <flibbleREMOVETHISBIT@i42.co.uk> - 2019-11-21 17:34 +0000
Re: [QT creator on "nix"] - getting a strict 8 bit (1 byte) array with no padding Christian Gollwitzer <auriocus@gmx.de> - 2019-11-22 07:26 +0100
Re: [QT creator on "nix"] - getting a strict 8 bit (1 byte) array with no padding Keith Thompson <kst-u@mib.org> - 2019-11-22 00:37 -0800
Re: [QT creator on "nix"] - getting a strict 8 bit (1 byte) array with no padding David Brown <david.brown@hesbynett.no> - 2019-11-22 10:10 +0100
Re: [QT creator on "nix"] - getting a strict 8 bit (1 byte) array with no padding Öö Tiib <ootiib@hot.ee> - 2019-11-22 02:23 -0800
Re: [QT creator on "nix"] - getting a strict 8 bit (1 byte) array with no padding David Brown <david.brown@hesbynett.no> - 2019-11-22 12:38 +0100
Re: [QT creator on "nix"] - getting a strict 8 bit (1 byte) array with no padding Manfred <noname@add.invalid> - 2019-11-22 17:13 +0100
Re: [QT creator on "nix"] - getting a strict 8 bit (1 byte) array with no padding David Brown <david.brown@hesbynett.no> - 2019-11-22 18:48 +0100
Re: [QT creator on "nix"] - getting a strict 8 bit (1 byte) array with no padding James Kuyper <jameskuyper@alumni.caltech.edu> - 2019-11-22 10:49 -0500
Re: [QT creator on "nix"] - getting a strict 8 bit (1 byte) array with no padding James Kuyper <jameskuyper@alumni.caltech.edu> - 2019-11-22 10:52 -0500
Re: [QT creator on "nix"] - getting a strict 8 bit (1 byte) array with no padding Tim Rentsch <tr.17687@z991.linuxsc.com> - 2019-11-28 12:51 -0800
Re: [QT creator on "nix"] - getting a strict 8 bit (1 byte) array with no padding Soviet_Mario <SovietMario@CCCP.MIR> - 2019-11-22 11:20 +0100
Re: [QT creator on "nix"] - getting a strict 8 bit (1 byte) array with no padding Keith Thompson <kst-u@mib.org> - 2019-11-22 10:00 -0800
Re: [QT creator on "nix"] - getting a strict 8 bit (1 byte) array with no padding David Brown <david.brown@hesbynett.no> - 2019-11-22 09:37 +0100
Re: [QT creator on "nix"] - getting a strict 8 bit (1 byte) array with no padding Öö Tiib <ootiib@hot.ee> - 2019-11-22 01:37 -0800
Re: [QT creator on "nix"] - getting a strict 8 bit (1 byte) array with no padding David Brown <david.brown@hesbynett.no> - 2019-11-22 11:40 +0100
Re: [QT creator on "nix"] - getting a strict 8 bit (1 byte) array with no padding Öö Tiib <ootiib@hot.ee> - 2019-11-22 04:55 -0800
Re: [QT creator on "nix"] - getting a strict 8 bit (1 byte) array with no padding David Brown <david.brown@hesbynett.no> - 2019-11-22 15:18 +0100
Re: [QT creator on "nix"] - getting a strict 8 bit (1 byte) array with no padding Öö Tiib <ootiib@hot.ee> - 2019-11-22 07:23 -0800
Re: [QT creator on "nix"] - getting a strict 8 bit (1 byte) array with no padding David Brown <david.brown@hesbynett.no> - 2019-11-22 16:34 +0100
Re: [QT creator on "nix"] - getting a strict 8 bit (1 byte) array with no padding scott@slp53.sl.home (Scott Lurndal) - 2019-11-22 15:16 +0000
Re: [QT creator on "nix"] - getting a strict 8 bit (1 byte) array with no padding Öö Tiib <ootiib@hot.ee> - 2019-11-23 05:11 -0800
Re: [QT creator on "nix"] - getting a strict 8 bit (1 byte) array with no padding James Kuyper <jameskuyper@alumni.caltech.edu> - 2019-11-22 10:56 -0500
Re: [QT creator on "nix"] - getting a strict 8 bit (1 byte) array with no padding Öö Tiib <ootiib@hot.ee> - 2019-11-23 07:03 -0800
Re: [QT creator on "nix"] - getting a strict 8 bit (1 byte) array with no padding Soviet_Mario <SovietMario@CCCP.MIR> - 2019-11-22 11:31 +0100
Re: [QT creator on "nix"] - getting a strict 8 bit (1 byte) array with no padding David Brown <david.brown@hesbynett.no> - 2019-11-22 12:23 +0100
Re: [QT creator on "nix"] - getting a strict 8 bit (1 byte) array with no padding Soviet_Mario <SovietMario@CCCP.MIR> - 2019-11-22 13:14 +0100
Re: [QT creator on "nix"] - getting a strict 8 bit (1 byte) array with no padding David Brown <david.brown@hesbynett.no> - 2019-11-22 15:04 +0100
Re: [QT creator on "nix"] - getting a strict 8 bit (1 byte) array with no padding Soviet_Mario <SovietMario@CCCP.MIR> - 2019-11-22 19:35 +0100
Re: [QT creator on "nix"] - getting a strict 8 bit (1 byte) array with no padding James Kuyper <jameskuyper@alumni.caltech.edu> - 2019-11-22 14:11 -0500
Re: [QT creator on "nix"] - getting a strict 8 bit (1 byte) array with no padding Soviet_Mario <SovietMario@CCCP.MIR> - 2019-11-23 00:25 +0100
Re: [QT creator on "nix"] - getting a strict 8 bit (1 byte) array with no padding James Kuyper <jameskuyper@alumni.caltech.edu> - 2019-11-22 23:56 -0500
Re: [QT creator on "nix"] - getting a strict 8 bit (1 byte) array with no padding Soviet_Mario <SovietMario@CCCP.MIR> - 2019-11-23 11:12 +0100
Re: [QT creator on "nix"] - getting a strict 8 bit (1 byte) array with no padding Paavo Helde <myfirstname@osa.pri.ee> - 2019-11-23 14:51 +0200
Re: [QT creator on "nix"] - getting a strict 8 bit (1 byte) array with no padding James Kuyper <jameskuyper@alumni.caltech.edu> - 2019-11-25 11:45 -0500
Re: [QT creator on "nix"] - getting a strict 8 bit (1 byte) array with no padding Keith Thompson <kst-u@mib.org> - 2019-11-22 22:04 -0800
Re: [QT creator on "nix"] - getting a strict 8 bit (1 byte) array with no padding Soviet_Mario <SovietMario@CCCP.MIR> - 2019-11-23 11:26 +0100
Re: [QT creator on "nix"] - getting a strict 8 bit (1 byte) array with no padding Keith Thompson <kst-u@mib.org> - 2019-11-23 12:27 -0800
Re: [QT creator on "nix"] - getting a strict 8 bit (1 byte) array with no padding Soviet_Mario <SovietMario@CCCP.MIR> - 2019-11-24 00:54 +0100
Re: [QT creator on "nix"] - getting a strict 8 bit (1 byte) array with no padding Keith Thompson <kst-u@mib.org> - 2019-11-23 17:06 -0800
Re: [QT creator on "nix"] - getting a strict 8 bit (1 byte) array with no padding Soviet_Mario <SovietMario@CCCP.MIR> - 2019-11-24 12:10 +0100
Re: [QT creator on "nix"] - getting a strict 8 bit (1 byte) array with no padding Tim Rentsch <tr.17687@z991.linuxsc.com> - 2019-11-28 13:21 -0800
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