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Re: Special Data Type Declaration and Usage

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From Ian Collins <ian-news@hotmail.com>
Newsgroups comp.lang.c++
Subject Re: Special Data Type Declaration and Usage
Date Wed, 16 Nov 2011 10:09:22 +1300
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On 11/16/11 10:04 AM, Mike Copeland wrote:
>     I need to declare an enormous array (100,000 members) of a small
> scalar object, and I want to populate it with default values and change
> some of them as needed throughout the processing.  The range of distinct
> values for each element is 0-15, so I could use a 4 bit "mini-byte" if
> something like that existed.
>     My question is: can I declare a bit structure data type and use it
> this way?  If that's possible, I don't know how to do so, nor how I'd
> manipulate the data values in it.  Please advise.  TIA

You can't have a single type smaller than a char.  You could put a pair 
of your "mini-byes" in a bit-field.

-- 
Ian Collins

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Thread

Special Data Type Declaration and Usage mrc2323@cox.net (Mike Copeland) - 2011-11-15 14:04 -0700
  Re: Special Data Type Declaration and Usage Ian Collins <ian-news@hotmail.com> - 2011-11-16 10:09 +1300
  Re: Special Data Type Declaration and Usage "Gennaro Prota" <gennaro.prota+Usenet@gmail.com> - 2011-11-15 22:16 +0100
    Re: Special Data Type Declaration and Usage mrc2323@cox.net (Mike Copeland) - 2011-11-15 14:30 -0700
      Re: Special Data Type Declaration and Usage Ian Collins <ian-news@hotmail.com> - 2011-11-16 10:36 +1300
        Re: Special Data Type Declaration and Usage mrc2323@cox.net (Mike Copeland) - 2011-11-15 15:02 -0700
          Re: Special Data Type Declaration and Usage Victor Bazarov <v.bazarov@comcast.invalid> - 2011-11-15 18:10 -0500
      Re: Special Data Type Declaration and Usage "Gennaro Prota" <gennaro.prota+Usenet@gmail.com> - 2011-11-15 23:58 +0100
      Re: Special Data Type Declaration and Usage Nick Keighley <nick_keighley_nospam@hotmail.com> - 2011-11-16 06:42 -0800
        Re: Special Data Type Declaration and Usage Jorgen Grahn <grahn+nntp@snipabacken.se> - 2011-11-16 17:16 +0000
          Re: Special Data Type Declaration and Usage Nick Keighley <nick_keighley_nospam@hotmail.com> - 2011-11-17 00:04 -0800
  Re: Special Data Type Declaration and Usage Brian Drummond <brian@shapes.demon.co.uk> - 2011-11-15 22:17 +0000
  Re: Special Data Type Declaration and Usage Jorgen Grahn <grahn+nntp@snipabacken.se> - 2011-11-15 22:19 +0000
    Re: Special Data Type Declaration and Usage Ian Collins <ian-news@hotmail.com> - 2011-11-16 11:51 +1300
      Re: Special Data Type Declaration and Usage Jorgen Grahn <grahn+nntp@snipabacken.se> - 2011-11-16 00:27 +0000
  Re: Special Data Type Declaration and Usage Paavo Helde <myfirstname@osa.pri.ee> - 2011-11-15 16:28 -0600

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