From: aschwarz@acm.org (skidmarks)
Subject: Re: Conditional compilation in Ada?
Date: 23 Nov 2004 07:42:21 -0800
Date: 2004-11-23T07:42:21-08:00 [thread overview]
Message-ID: <35f054ea.0411230742.62e84f5d@posting.google.com> (raw)
In-Reply-To: 41A28F3D.2030008@acm.org
>
>
> Package one body is
>
> Debug_Flag : Boolean := TRUE; // Note: this is a variable
> // and placed in the spec file.
>
> function Is_Debug return Boolean is
> begin -- Is_Debug
> return Debug_Flag;
> end Is_Debug;
> pragma inline( Is_Debug );
>
Sorry. I just read the original post. The advantage of using constants
is that the compiler (should) remove the conditional branch which is
never executed, viz.
Debug_Flag := constant Boolean := TRUE;
if ( Debug_Flag ) then null; // always executed
else null; // never executed and the compiler
will
end if; // remove the code
The function 'Is_Debug' with a pragma inline should have the same
effect.
Since the flag conditions the branch, it is possible to compile all
required code variants and select them at run-time by using a variable
flag instead of a constant. If you are willing to perform multiple
builds, then a constant flag achieves much the same effect as a C/C++
conditional compilation. And, of course, the Is_Debug is thrown in as
a 'plus'.
art
next prev parent reply other threads:[~2004-11-23 15:42 UTC|newest]
Thread overview: 47+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-11-16 18:30 Conditional compilation in Ada? jtg
2004-11-16 18:45 ` Marius Amado Alves
2004-11-16 20:41 ` Nick Roberts
2004-11-17 8:36 ` Alex R. Mosteo
2004-11-16 19:03 ` Jeffrey Carter
2004-11-16 19:13 ` Hyman Rosen
2004-11-16 19:41 ` Björn Lundin
2004-11-16 20:08 ` tmoran
2004-11-16 20:27 ` Hyman Rosen
2004-11-16 23:49 ` Jim Rogers
2004-11-16 20:43 ` Martin Dowie
2004-11-16 19:06 ` tmoran
2004-11-17 9:39 ` Adrien Plisson
2004-11-17 16:39 ` Jacob Sparre Andersen
2004-11-17 2:44 ` Steve
2004-11-17 20:30 ` Jeffrey Carter
2004-11-18 4:09 ` Steve
2004-11-18 6:49 ` Martin Dowie
2004-11-18 15:17 ` Georg Bauhaus
2004-11-18 19:12 ` Martin Dowie
2004-11-18 17:34 ` Jeffrey Carter
2004-11-18 17:44 ` Jeffrey Carter
2004-11-18 18:03 ` Alex R. Mosteo
2004-11-19 3:00 ` Steve
2004-11-19 21:35 ` Simon Wright
2004-11-20 2:56 ` Steve
2004-11-20 16:57 ` Simon Wright
2004-11-17 9:28 ` Martin Krischik
2004-11-17 13:39 ` Stephen Leake
2004-11-17 10:02 ` Frank Piron
2004-11-17 12:32 ` Georg Bauhaus
2004-11-17 14:44 ` Dmitry A. Kazakov
2004-11-18 15:23 ` Georg Bauhaus
2004-11-18 22:10 ` Brian May
2004-11-19 9:03 ` Martin Krischik
2004-11-20 17:31 ` Georg Bauhaus
2004-11-21 9:14 ` Martin Krischik
2004-12-12 0:36 ` Lionel Draghi
2004-12-12 0:17 ` How to switch off those damm warnings about unknows pragma Lionel Draghi
2004-12-13 11:10 ` Georg Bauhaus
2004-12-13 15:07 ` Peter Amey
2004-11-20 1:05 ` Conditional compilation in Ada? Dr. Adrian Wrigley
2004-11-20 17:25 ` Georg Bauhaus
2004-11-23 1:15 ` Arthur Schwarz
2004-11-23 15:42 ` skidmarks [this message]
2004-11-17 12:27 ` Marin David Condic
-- strict thread matches above, loose matches on Subject: below --
2004-11-19 9:13 Christoph Karl Walter Grein
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