From: Neil Booth <neil@daikokuya.demon.co.uk>
To: Frank Klemm <pfk@fuchs.offl.uni-jena.de>
Cc: gcc@gcc.gnu.org
Subject: Re: Proposal
Date: Tue, 18 Sep 2001 11:06:00 -0000 [thread overview]
Message-ID: <20010918190527.A15299@daikokuya.demon.co.uk> (raw)
In-Reply-To: <20010918021527.A14623@fuchs.offl.uni-jena.de>
Frank Klemm wrote:-
> For instance you have a program which uses _ in numbers.
> But not all compilers will will support this in the beginning.
Sure.
> It should be possible to write a program which removes these _ inside of
> numbers to allow to compile such source files with other compilers.
If the _'s aren't already in your source code, I don't see much point
putting them there with macros. Wasn't the whole idea legibility?
> Without this rule it is impossible to write such a program without
> preprocessing the source file. And preprocessed files are no source files
> anymore.
Well, you might be able to filter it through sed or something, with a
little difficulty.
> To prevent this it is forbidden to use this feature in conjunction with
> token concatenation. At least as long as this is not an ISO standard.
>
> For instance try to convert
>
> #define MILLION MY_MERGE_5 ( 1, _, 000, _, 000 )
>
> to the old representation. Note that MY_MERGE_5 is a self defined macro.
I don't know what you mean by a self-defined macro. I don't
understand why you're using macros (see comment above). I'm not even
sure what the definition of MY_MERGE_5 is, though I might guess.
Anyway, if you insist on macros, you could get what you want through
an extra indirection, and an extra macro
#if COMPILER_UNDERSTANDS_EXTENDED_NUMBERS
#define UNDERSCORE _
#else
#define UNDERSCORE
#endif
#define MY_MERGE_5_INDIRECT (a, b, c, d, e) MY_MERGE_5 (a, b, c, d, e)
#define MILLION MY_MERGE_5_INDIRECT (1, UNDERSCORE, 000, UNDERSCORE, 000)
But I really can't see the point here.
Neil.
next prev parent reply other threads:[~2001-09-18 11:06 UTC|newest]
Thread overview: 46+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-09-15 11:45 Proposal Frank Klemm
2001-09-15 12:15 ` Proposal Gerald Pfeifer
2001-09-17 16:00 ` Proposal Neil Booth
2001-09-18 2:30 ` Proposal Joseph S. Myers
2001-09-18 10:21 ` Proposal Zack Weinberg
2001-09-18 11:14 ` Proposal Joseph S. Myers
2001-09-18 22:20 ` Proposal Zack Weinberg
2001-09-19 1:14 ` Proposal Joseph S. Myers
2001-09-18 12:23 ` Proposal Frank Klemm
2001-09-18 22:37 ` Proposal Zack Weinberg
2001-09-19 0:02 ` Proposal Neil Booth
2001-09-19 2:23 ` Proposal Tim Hollebeek
2001-09-19 2:41 ` Proposal Richard Earnshaw
2001-09-19 13:38 ` Proposal Joe Buck
2001-09-18 15:35 ` Proposal Robert Lipe
2001-09-18 16:59 ` Proposal Russ Allbery
2001-09-20 11:17 ` Proposal Kai Henningsen
2001-09-20 12:34 ` Proposal Russ Allbery
2001-09-18 9:48 ` Proposal Frank Klemm
2001-09-18 11:06 ` Neil Booth [this message]
2001-09-18 11:37 ` Proposal Kevin Handy
2001-09-18 15:48 ` Proposal Neil Booth
2001-09-18 15:55 ` Proposal Toon Moene
2001-09-27 5:39 ` Proposal Alexandre Oliva
2001-09-27 7:09 ` Proposal Frank Klemm
2001-09-27 16:22 ` Proposal Zack Weinberg
2001-09-29 15:45 ` Proposal Frank Klemm
2001-09-30 9:35 ` Proposal Zack Weinberg
2001-09-27 16:36 ` Proposal Neil Booth
2001-09-29 15:45 ` Proposal Frank Klemm
2001-09-29 17:22 ` Proposal Daniel Jacobowitz
2001-09-29 18:32 ` OT: Proposal Michael Matz
2001-10-03 3:52 ` Proposal Fergus Henderson
2001-09-17 8:55 Proposal Thomas R. Truscott
2001-09-18 9:32 Proposal dewar
2001-09-18 12:30 Proposal dewar
2001-09-18 23:01 ` Proposal Zack Weinberg
2001-09-19 0:06 Proposal dewar
2001-09-19 2:34 Proposal dewar
2001-09-19 2:44 Proposal dewar
2012-09-03 15:16 Proposal Afeez Basit
2012-09-03 18:35 Proposal Afeez Basit
2013-06-26 17:41 Proposal Barrister David Lopez Esq
2013-06-26 18:15 ` Proposal Paolo Carlini
2013-06-26 18:40 ` Proposal Daniel Santos
2013-06-26 17:47 Proposal Barrister David Lopez Esq
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