From: Mark Mitchell <mark@codesourcery.com>
To: Zack Weinberg <zack@codesourcery.com>
Cc: Gabriel Dos Reis <gdr@cs.tamu.edu>,
gcc@gcc.gnu.org, jason@redhat.com, dberlin@dberlin.org
Subject: Re: Compiling GCC with g++: a report
Date: Tue, 24 May 2005 07:04:00 -0000 [thread overview]
Message-ID: <4292C8C9.9040400@codesourcery.com> (raw)
In-Reply-To: <877jhpkut9.fsf@codesourcery.com>
Zack Weinberg wrote:
> Mark Mitchell <mark@codesourcery.com> writes:
>
> [snip stuff addressed elsewhere]
>
>>I agree with the goal of more hiding.
>>
>>You can do this in C by using an incomplete structure type in most
>>places, and then, in the files where you want the definition visible,
>>defining the structure to have a single field of the enumerated
>>type. That is a little messy, but it is C++-compatible. (In fact, in
>>ISO C++, without the additions presently in the WP, you can't do
>>better; forward declarations of enums are still not allowed.)
>
>
> Doesn't work, at least not as a drop-in replacement; you can't pass an
> incomplete structure by value. We do do this in places where there's
> a real structure that can be passed around by pointer...
Good point; yes, you would have to pass a pointer. I guess you could
create a singleton representative of each value in the enum, and pass
them around, but I agree that's getting pretty ugly. Of course, the
problem with "unsigned int" is that it is a complete type, and people
can accidentally pass in "7", even if there's no such enumeral. You
really want forward-declared enums, but you haven't got them; it may be
you just lose. :-(
--
Mark Mitchell
CodeSourcery, LLC
mark@codesourcery.com
(916) 791-8304
next prev parent reply other threads:[~2005-05-24 6:25 UTC|newest]
Thread overview: 106+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-05-23 11:50 Gabriel Dos Reis
2005-05-23 12:22 ` Ranjit Mathew
2005-05-23 19:07 ` Tom Tromey
2005-05-23 18:04 ` Gabriel Dos Reis
2005-05-24 4:57 ` Gabriel Dos Reis
2005-05-24 4:59 ` Joseph S. Myers
2005-05-24 21:50 ` Kevin Handy
2005-05-25 12:02 ` Bernardo Innocenti
2005-05-24 5:54 ` Zack Weinberg
2005-05-24 6:04 ` Daniel Jacobowitz
2005-05-24 6:22 ` Gabriel Dos Reis
2005-05-24 6:29 ` Zack Weinberg
2005-05-24 6:31 ` Mark Mitchell
2005-05-24 7:08 ` Zack Weinberg
2005-05-24 7:09 ` Mark Mitchell
2005-05-24 7:39 ` Gabriel Dos Reis
2005-05-24 8:48 ` Zack Weinberg
2005-05-24 13:41 ` Gabriel Dos Reis
2005-05-25 0:47 ` Russ Allbery
2005-05-25 1:24 ` Gabriel Dos Reis
2005-05-24 16:07 ` Paolo Bonzini
2005-05-24 16:44 ` Daniel Jacobowitz
2005-05-24 23:53 ` Zack Weinberg
2005-05-25 0:06 ` Daniel Jacobowitz
2005-05-25 0:11 ` Richard Henderson
2005-05-25 0:22 ` Zack Weinberg
2005-05-25 0:26 ` Paolo Carlini
2005-05-25 0:37 ` Zack Weinberg
2005-05-25 0:43 ` Daniel Jacobowitz
2005-05-25 0:48 ` Zack Weinberg
2005-05-25 1:02 ` Paolo Carlini
2005-05-25 3:14 ` Daniel Jacobowitz
2005-05-25 13:30 ` libstdc++ soname and versioning (was: Re: Compiling GCC...) Paolo Carlini
2005-05-25 13:45 ` Theodore Papadopoulo
2005-05-25 13:53 ` libstdc++ soname and versioning Paolo Carlini
2005-05-25 14:18 ` Theodore Papadopoulo
2005-05-25 14:51 ` Gabriel Dos Reis
2005-05-25 14:52 ` Paolo Carlini
2005-05-25 13:54 ` libstdc++ soname and versioning (was: Re: Compiling GCC...) Gabriel Dos Reis
2005-05-25 14:35 ` Theodore Papadopoulo
2005-05-25 16:18 ` Compiling GCC with g++: a report Jason Merrill
2005-05-25 12:44 ` Christoph Hellwig
2005-05-25 13:33 ` Florian Weimer
2005-05-27 3:10 ` Marcin Dalecki
2005-05-24 6:13 ` Andrew Pinski
2005-05-24 6:25 ` Gabriel Dos Reis
2005-05-27 4:04 ` Marcin Dalecki
2005-05-24 6:18 ` Gabriel Dos Reis
2005-05-24 6:43 ` Zack Weinberg
2005-05-24 7:04 ` Mark Mitchell
2005-05-24 8:00 ` Gabriel Dos Reis
2005-05-25 3:45 ` Kaveh R. Ghazi
2005-05-25 7:45 ` DJ Delorie
2005-05-25 8:36 ` Gabriel Dos Reis
2005-05-25 13:38 ` Kaveh R. Ghazi
2005-05-26 13:40 ` Gabriel Dos Reis
2005-05-24 7:38 ` Gabriel Dos Reis
2005-05-24 8:32 ` Zack Weinberg
2005-05-24 13:18 ` Gabriel Dos Reis
2005-05-24 23:45 ` Zack Weinberg
2005-05-25 0:29 ` Gabriel Dos Reis
2005-05-25 0:37 ` Zack Weinberg
2005-05-25 0:52 ` DJ Delorie
2005-05-25 0:55 ` Zack Weinberg
2005-05-25 1:02 ` Ian Lance Taylor
2005-05-25 1:36 ` DJ Delorie
2005-05-25 1:40 ` Zack Weinberg
2005-05-25 2:24 ` Gabriel Dos Reis
2005-05-25 21:37 ` hidden enum constants (Was: Compiling GCC with g++: a report) Giovanni Bajo
2005-05-25 1:50 ` Compiling GCC with g++: a report Gabriel Dos Reis
2005-05-25 2:20 ` DJ Delorie
2005-05-25 1:47 ` Gabriel Dos Reis
2005-05-25 2:08 ` DJ Delorie
2005-05-25 2:36 ` Gabriel Dos Reis
2005-05-25 3:34 ` DJ Delorie
2005-05-25 5:01 ` Gabriel Dos Reis
2005-05-25 1:12 ` Gabriel Dos Reis
2005-05-25 1:47 ` DJ Delorie
2005-05-25 3:20 ` Gabriel Dos Reis
2005-05-27 1:20 ` Marcin Dalecki
2005-05-24 17:17 ` Paul Koning
2005-05-24 17:25 ` Andreas Schwab
2005-05-24 20:43 ` Joe Buck
2005-05-24 21:40 ` Dale Johannesen
2005-05-24 17:49 ` Gabriel Dos Reis
2005-05-24 6:26 ` Mark Mitchell
2005-05-24 6:54 ` Zack Weinberg
2005-05-24 7:04 ` Mark Mitchell [this message]
2005-05-24 15:03 ` Kai Henningsen
2005-05-25 9:51 ` Jason Merrill
2005-05-24 10:01 ` Florian Weimer
2005-05-24 14:22 ` Gabriel Dos Reis
2005-05-24 18:00 ` Diego Novillo
2005-05-24 20:41 ` Richard Guenther
2005-05-24 23:14 ` Kevin Handy
2005-05-27 3:47 ` Marcin Dalecki
2005-05-27 1:20 ` Marcin Dalecki
2005-05-25 5:26 Paul Schlie
2005-05-25 6:10 ` DJ Delorie
2005-05-25 11:46 ` Paul Schlie
2005-05-25 18:31 ` DJ Delorie
2005-05-25 21:41 ` Paul Schlie
2005-05-26 6:11 ` DJ Delorie
2005-05-26 8:15 ` Paul Schlie
2005-05-26 11:57 ` DJ Delorie
2005-05-25 19:27 Richard Kenner
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