Re: [QT creator on "nix"] - getting a strict 8 bit (1 byte) array with no padding

From	James Kuyper <jameskuyper@alumni.caltech.edu>
Newsgroups	comp.lang.c++
Subject	Re: [QT creator on "nix"] - getting a strict 8 bit (1 byte) array with no padding
Date	2019-11-22 10:56 -0500
Organization	A noiseless patient Spider
Message-ID	<qr90f4$e4b$1@dont-email.me> (permalink)
References	(3 earlier) <qr5tre$mhv$1@dont-email.me> <qr6dgn$j2c$1@dont-email.me> <qr7v3c$lvv$1@dont-email.me> <qr86ov$q9d$1@dont-email.me> <1aa8edb8-433b-4bdd-a67c-805bf6c2441f@googlegroups.com>

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On 11/22/19 4:37 AM, Öö Tiib wrote:
> On Friday, 22 November 2019 10:37:59 UTC+2, David Brown  wrote:
...
>> They can lead to inefficiencies - on some compilers and targets, packed
>> fields are accessed by byte.  Even when the fields are accessed by their
>> full size, packed means you can get misalignments, which can have a very
>> significant impact on efficiency in some situations.
> 
> Huh? Packed structs usually lead to raise of storage efficiency.

He said efficiency, not "storage efficiency". If there's any difference
between the packed and unpacked version of a struct, the packed version
usually requires slower access. If that weren't the case, there'd be no
motive for the implementation to make the unpacked version different.

Thread

[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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