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Article #4023

references and ellipsis

#4023
From: Laurent FRIGAULT
Date: Sat, 13 Apr 1996 23:17
45 lines
2007 bytes
Hi,

I discover a problem when trying to use a C++ reference to an object
just before an ellipsis :

int foo(const int& aInt,...){
va_list params;

	va_start(params,aInt);
	// ...
	va_end(params);

	return 0;

}

I try this kind of code under several environnement and it compile well.
g++ 2.7.2 under sunos 4.1.3 give me a warning:
warning: second parameter of `va_start' not last named argument
but the code works fine.

Under NT with BC++ 4.51 and VC++ 2.1, I dont get any warning, but
the generated code is wrong.

If I replace the reference with a pointer or an object, the code works
in all cases. I couldn't find anything about a reference before an ellipsis
on the draft, so I presume that the code is correct.
Can someone confirm if this is correct or not.

If yes, I presume that the problem is in the implementation of va_start
that uses sizeof on the reference.

regards

Lolo
--
  Laurent Frigault | frigault@gla.ecoledoc.ibp.fr



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From: frigault@gla.ecoledoc.ibp.fr (Laurent FRIGAULT)
Newsgroups: comp.std.c++,comp.lang.c++.moderated
Subject: references and ellipsis
Date: 13 Apr 1996 23:17:34 GMT
Organization: Universites Paris VI/Paris VII - France
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