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Re: assigning to variable arguments
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Re: assigning to variable arguments


  • Subject: Re: assigning to variable arguments
  • From: "Justin C. Walker" <email@hidden>
  • Date: Thu, 1 Dec 2005 21:27:57 -0800

Hi, all,

Adding my $0.017 e:

On Dec 1, 2005, at 21:05 , Madan Kumar B N wrote:

Hi,
I ran into the same trouble with Fireworks Codebase. I workaround this by
passing ptrs instead of the objects.
My problem was little typical because I was supposed to pass class objects.
Passing simple POD-types through va_arg list works but when we try to pass
our class objects in va_lists it would fail,so would prefer passing pts.

It's been a while since I fiddled with this, but I believe that, in gcc 4.x (in fact, from gcc 3.3 on), support for the (ill- conceived :-}) varargs hack has been eliminated (or deprecated, I think, depending on how the compiler is built).


If you look at <varargs.h>on Mac OS X, 10.4, you will see that it is "MWERKS-only".

If you want to use this kind of code with gcc 4, I think you need to use <stdarg.h> and modify your source appropriately. I have lost the URL, but if you google appropriately, you can find instructions for the more-or-less straight-forward modifications you need to make to bring your code "up to date".

Regards,

Justin

On 12/1/05 10:04 PM, "Andy Finnell" <email@hidden> wrote:


Hi all,

I'm converting a project from CodeWarrior to Xcode 2.2/gcc 4. I've
run into some code that attempts reorder a variable argument list
(for localized string formatting). The basic code is:

va_start(argList, format);

int foo = 4;
va_arg(argList, int) = foo;

gcc doesn't like the last line because va_arg doesn't return an lval.
Specifcally its says "invalid lvalue in assignment".  Apparently
CodeWarrior va_arg returned a reference, which gcc doesn't.

Is there any way to modify a va_list, either in place or build one up
dynamically?

Thanks,

     -andy

--
Andy Finnell
Senior Software Architect
Order N Development, LLC
http://www.orderndev.com



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-- Justin C. Walker, Curmudgeon-At-Large Institute for General Semantics -------- Experience is what you get when you don't get what you want. --------



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References: 
 >Re: assigning to variable arguments (From: Madan Kumar B N <email@hidden>)

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