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Groups > comp.lang.c > #16621

Re: Am I being too C++ like?

From Shao Miller <sha0.miller@gmail.com>
Newsgroups comp.lang.c
Subject Re: Am I being too C++ like?
Date 2012-02-01 17:36 -0500
Organization A noiseless patient Spider
Message-ID <jgceon$tt$1@dont-email.me> (permalink)
References (3 earlier) <kfny5sn1p0y.fsf@x-alumni2.alumni.caltech.edu> <lnzkd3wirb.fsf@nuthaus.mib.org> <kfnobtjxb9g.fsf@x-alumni2.alumni.caltech.edu> <lnhazauzlw.fsf@nuthaus.mib.org> <jgc97b$va3$1@dont-email.me>

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On 2/1/2012 16:01, Stephen Sprunk wrote:
> On 01-Feb-12 13:23, Keith Thompson wrote:
>> Tim Rentsch<txr@alumni.caltech.edu>  writes:
>>> The cost of doing either of those is small.  Besides, the most
>>> important use case for typedef'ing a struct is to make a
>>> (mostly) opaque type, in which case the header file will
>>> forward-declare the struct type (without defining its contents)
>>> along with the typedef, so the incremental cost of doing
>>> a forward declaration is zero.
>>
>> Yes, if you want an opaque type, a typedef is perfectly appropriate; I
>> should have mentioned that.  By "opaque" in this case, I mean that the
>> code that uses the type doesn't need to know or care that the type is a
>> struct.
>>
>> I haven't seen a whole lot of code like that.
>
> What about FILE?  Is there any implementation where that "opaque" type
> _isn't_ actually a struct?
>

It can be an integer to index into a fixed-size array of structs, where 
there is a maximum number of open files.  I've seen this in the 
boot-loader for a particular OS, I believe.

-- 
"The stationery store has moved.  Aaargh!"

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Thread

Am I being too C++ like? nroberts <roberts.noah@gmail.com> - 2012-01-18 13:53 -0800
  Re: Am I being too C++ like? Shao Miller <sha0.miller@gmail.com> - 2012-01-18 18:50 -0500
    Re: Am I being too C++ like? Nobody <nobody@nowhere.com> - 2012-01-19 04:13 +0000
    Re: Am I being too C++ like? ImpalerCore <jadill33@gmail.com> - 2012-01-19 09:09 -0800
  Re: Am I being too C++ like? Philip Lantz <prl@canterey.us> - 2012-01-18 21:42 -0800
  Re: Am I being too C++ like? Jorgen Grahn <grahn+nntp@snipabacken.se> - 2012-01-19 12:30 +0000
    Re: Am I being too C++ like? "BartC" <bc@freeuk.com> - 2012-01-19 15:17 +0000
      Re: Am I being too C++ like? Keith Thompson <kst-u@mib.org> - 2012-01-19 18:44 -0800
        Re: Am I being too C++ like? "BartC" <bc@freeuk.com> - 2012-01-20 13:44 +0000
          Re: Am I being too C++ like? Eric Sosman <esosman@ieee-dot-org.invalid> - 2012-01-20 09:08 -0500
            Re: Am I being too C++ like? Malcolm McLean <malcolm.mclean5@btinternet.com> - 2012-01-20 07:58 -0800
            Re: Am I being too C++ like? Keith Thompson <kst-u@mib.org> - 2012-01-20 11:25 -0800
            Re: Am I being too C++ like? Kleuske <kleuske@nowhere.net> - 2012-01-20 20:17 +0000
              Re: Am I being too C++ like? Ian Collins <ian-news@hotmail.com> - 2012-01-21 09:23 +1300
                Re: Am I being too C++ like? Kleuske <kleuske@nowhere.net> - 2012-01-20 22:00 +0000
                Re: Am I being too C++ like? Stephen Sprunk <stephen@sprunk.org> - 2012-01-20 16:28 -0600
                Re: Am I being too C++ like? Ian Collins <ian-news@hotmail.com> - 2012-01-21 11:43 +1300
                Re: Am I being too C++ like? Eric Sosman <esosman@ieee-dot-org.invalid> - 2012-01-20 18:02 -0500
                Re: Am I being too C++ like? Keith Thompson <kst-u@mib.org> - 2012-01-20 16:12 -0800
                Re: Am I being too C++ like? Kaz Kylheku <kaz@kylheku.com> - 2012-01-21 00:13 +0000
                Re: Am I being too C++ like? William Ahern <william@wilbur.25thandClement.com> - 2012-01-20 17:37 -0800
                Re: Am I being too C++ like? Keith Thompson <kst-u@mib.org> - 2012-01-20 22:25 -0800
                Re: Am I being too C++ like? gazelle@shell.xmission.com (Kenny McCormack) - 2012-01-21 16:07 +0000
                Re: Am I being too C++ like? Bill Reid <hormelfree@gmail.com> - 2012-01-23 17:26 -0800
                Re: Am I being too C++ like? Kaz Kylheku <kaz@kylheku.com> - 2012-01-21 18:00 +0000
                Re: Am I being too C++ like? Ben Bacarisse <ben.usenet@bsb.me.uk> - 2012-01-21 21:25 +0000
                Re: Am I being too C++ like? Phil Carmody <thefatphil_demunged@yahoo.co.uk> - 2012-02-11 23:46 +0200
                Re: Am I being too C++ like? Ben Bacarisse <ben.usenet@bsb.me.uk> - 2012-02-11 22:56 +0000
                Re: Am I being too C++ like? Phil Carmody <thefatphil_demunged@yahoo.co.uk> - 2012-02-22 02:34 +0200
                Re: Am I being too C++ like? Jens Gustedt <jens.gustedt@loria.fr> - 2012-01-21 22:42 +0100
                Re: Am I being too C++ like? James Kuyper <jameskuyper@verizon.net> - 2012-01-21 21:22 -0500
                Re: Am I being too C++ like? Jens Gustedt <jens.gustedt@loria.fr> - 2012-01-22 14:56 +0100
                Re: Am I being too C++ like? Ian Collins <ian-news@hotmail.com> - 2012-01-22 10:29 +1300
                Re: Am I being too C++ like? Kleuske <kleuske@nowhere.net> - 2012-01-21 11:36 +0000
              Re: Am I being too C++ like? Jorgen Grahn <grahn+nntp@snipabacken.se> - 2012-01-22 12:13 +0000
                Re: Am I being too C++ like? Kleuske <kleuske@nowhere.net> - 2012-01-22 12:39 +0000
                Re: Am I being too C++ like? Jorgen Grahn <grahn+nntp@snipabacken.se> - 2012-01-23 23:45 +0000
                Re: Am I being too C++ like? Kleuske <kleuske@nowhere.net> - 2012-01-24 16:54 +0000
            Re: Am I being too C++ like? Nick Keighley <nick_keighley_nospam@hotmail.com> - 2012-01-22 04:43 -0800
              Re: Am I being too C++ like? Ben Bacarisse <ben.usenet@bsb.me.uk> - 2012-01-22 15:29 +0000
          Re: Am I being too C++ like? Jorgen Grahn <grahn+nntp@snipabacken.se> - 2012-01-21 11:58 +0000
          Re: Am I being too C++ like? Seebs <usenet-nospam@seebs.net> - 2012-01-21 21:32 +0000
  Re: Am I being too C++ like? Malcolm McLean <malcolm.mclean5@btinternet.com> - 2012-01-19 04:23 -0800
    Re: Am I being too C++ like? Rui Maciel <rui.maciel@gmail.com> - 2012-01-19 14:39 +0000
    Re: Am I being too C++ like? Nick Keighley <nick_keighley_nospam@hotmail.com> - 2012-01-22 05:14 -0800
      Re: Am I being too C++ like? Jorgen Grahn <grahn+nntp@snipabacken.se> - 2012-01-23 23:42 +0000
  Re: Am I being too C++ like? Rui Maciel <rui.maciel@gmail.com> - 2012-01-19 14:51 +0000
  Re: Am I being too C++ like? jgk@panix.com (Joe keane) - 2012-01-19 23:04 +0000
  Re: Am I being too C++ like? Ian Collins <ian-news@hotmail.com> - 2012-01-20 16:03 +1300
    Re: Am I being too C++ like? Malcolm McLean <malcolm.mclean5@btinternet.com> - 2012-01-20 06:01 -0800
      Re: Am I being too C++ like? Ian Collins <ian-news@hotmail.com> - 2012-01-21 08:03 +1300
        Re: Am I being too C++ like? Malcolm McLean <malcolm.mclean5@btinternet.com> - 2012-01-21 12:31 -0800
          Re: Am I being too C++ like? Ian Collins <ian-news@hotmail.com> - 2012-01-22 10:18 +1300
  Re: Am I being too C++ like? cri@tiac.net (Richard Harter) - 2012-01-20 05:22 +0000
  Re: Am I being too C++ like? Marco <prenom_nomus@yahoo.com> - 2012-01-21 07:29 -0800
    Re: Am I being too C++ like? Jorgen Grahn <grahn+nntp@snipabacken.se> - 2012-01-24 12:13 +0000
      Re: Am I being too C++ like? Tim Rentsch <txr@alumni.caltech.edu> - 2012-01-31 14:32 -0800
        Re: Am I being too C++ like? Keith Thompson <kst-u@mib.org> - 2012-01-31 15:32 -0800
          Re: Am I being too C++ like? Keith Thompson <kst-u@mib.org> - 2012-01-31 19:46 -0800
          Re: Am I being too C++ like? Shao Miller <sha0.miller@gmail.com> - 2012-01-31 23:54 -0500
            Re: Am I being too C++ like? Keith Thompson <kst-u@mib.org> - 2012-01-31 22:24 -0800
          Re: Am I being too C++ like? Tim Rentsch <txr@alumni.caltech.edu> - 2012-01-31 23:28 -0800
            Re: Am I being too C++ like? Keith Thompson <kst-u@mib.org> - 2012-02-01 11:23 -0800
              Re: Am I being too C++ like? Stephen Sprunk <stephen@sprunk.org> - 2012-02-01 15:01 -0600
                Re: Am I being too C++ like? Malcolm McLean <malcolm.mclean5@btinternet.com> - 2012-02-01 14:09 -0800
                Re: Am I being too C++ like? Keith Thompson <kst-u@mib.org> - 2012-02-01 14:44 -0800
                Re: Am I being too C++ like? Shao Miller <sha0.miller@gmail.com> - 2012-02-01 17:36 -0500
              Re: Am I being too C++ like? Tim Rentsch <txr@alumni.caltech.edu> - 2012-03-08 12:45 -0800
                Re: Am I being too C++ like? Ben Bacarisse <ben.usenet@bsb.me.uk> - 2012-03-08 21:41 +0000
                Re: Am I being too C++ like? Ian Collins <ian-news@hotmail.com> - 2012-03-09 17:42 +1300
                Re: Am I being too C++ like? Kaz Kylheku <kaz@kylheku.com> - 2012-03-09 08:12 +0000
                Re: Am I being too C++ like? Ben Bacarisse <ben.usenet@bsb.me.uk> - 2012-03-09 12:01 +0000
                Re: Am I being too C++ like? Keith Thompson <kst-u@mib.org> - 2012-03-08 14:19 -0800
                Re: Am I being too C++ like? Tim Rentsch <txr@alumni.caltech.edu> - 2012-03-09 13:32 -0800
                Re: Am I being too C++ like? nick_keighley_nospam@hotmail.com - 2012-03-09 04:18 -0800
                Re: Am I being too C++ like? Ike Naar <ike@iceland.freeshell.org> - 2012-03-09 13:04 +0000
                Re: Am I being too C++ like? Kaz Kylheku <kaz@kylheku.com> - 2012-03-10 01:02 +0000
                Re: Am I being too C++ like? Ike Naar <ike@iceland.freeshell.org> - 2012-03-10 07:59 +0000
                Re: Am I being too C++ like? Ian Collins <ian-news@hotmail.com> - 2012-03-10 21:17 +1300
                Re: Am I being too C++ like? nick_keighley_nospam@hotmail.com - 2012-03-10 02:39 -0800
                Re: Am I being too C++ like? Tim Rentsch <txr@alumni.caltech.edu> - 2012-03-09 13:51 -0800
                Re: Am I being too C++ like? nick_keighley_nospam@hotmail.com - 2012-03-10 02:54 -0800
            Re: Am I being too C++ like? Ian Collins <ian-news@hotmail.com> - 2012-03-10 12:27 +1300
          Re: Am I being too C++ like? Rui Maciel <rui.maciel@gmail.com> - 2012-02-01 07:41 +0000
            Re: Am I being too C++ like? Keith Thompson <kst-u@mib.org> - 2012-02-01 11:24 -0800
        Re: Am I being too C++ like? Jorgen Grahn <grahn+nntp@snipabacken.se> - 2012-02-01 21:55 +0000

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