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From: rhys@batserver.cs.uq.oz.au (Rhys Weatherley)
Newsgroups: comp.lang.c++
Subject: The __cplusplus macro - is it portable?
Message-ID: <5954@uqcspe.cs.uq.oz.au>
Date: 27 Nov 90 08:35:49 GMT
Sender: news@uqcspe.cs.uq.oz.au
Reply-To: rhys@batserver.cs.uq.oz.au
Lines: 33

The subject should say it all :-).  Basically, Turbo C++ has the macro
__cplusplus which is defined when Turbo C++ is compiling using C++ conventions.
This macro is handy for importing "standard C" routines by "wrapping up"
their prototypes and definitions, etc in the following form:

	#ifdef	__cplusplus
	extern	"C" {
	#endif

	... Plain ordinary C declarations and code ...

	#ifdef	__cplusplus
	}
	#endif

The 'extern "C"' declaration also appears to work in G++ (although I haven't
tried __cplusplus yet), but mainly I'm asking if a standard ANSI or pre-ANSI
macro does exist for this purpose.  Is it __cplusplus, or something different,
or isn't there one at all?  This is of concern to me since I'm on a huge
"portability drive" at the moment.

So much for "dumb question number 437", but I'm sure lots of "portability
freaks" out there would also be interested.

Rhys.

P.S. I didn't post to comp.std.c++ because different compilers may have
     different ways of doing this operation, which are "not standard".

+===============================+==============================+
||  Rhys Weatherley             |  University of Queensland,  ||
||  rhys@batserver.cs.uq.oz.au  |  Australia.  G'day!!        ||
+===============================+==============================+