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From: leo@atcmp.nl (Leo  Willems)
Newsgroups: comp.lang.c++
Subject: void* cast
Keywords: void * cast ANSI C++
Message-ID: <808@atcmpe.atcmp.nl>
Date: 25 Nov 90 22:55:45 GMT
Organization: AT Computing, Nijmegen, The Netherlands
Lines: 30


In C++ it is not allowed to assign to a void* without a cast, in
ANSI C however one may do so.

	int *pi;  void *pv;

C++:
	pi = (int*) pv;

I always imagined why a cast was needed, the context made it clear an int*
conversion was expected.
	
I never could find an example for this difference untill I ran 
into this:

C++:
	wait((int*)0);		//SV
	wait((union wait*)0);	//BSD

ANSI C:

	wait((void*)0);		//SV + BSD


In my vision, the ANSI C example need not be portable.

Is this a good example of the reason between the C++/ANSI C diff.?
If it is not, can someone give me a good example?

Thanks.