Date: Tue, 9 Apr 1996 21:52:25 -0400
From: dj (DJ Delorie)
Message-Id: <199604100152.VAA18072@delorie.com>
To: Jetman AT gnn DOT com
CC: djgpp AT delorie DOT com
In-reply-to: <199604091541.LAA31790@mail-e2b-service.gnn.com> (message from Jethro Wright on Tue, 09 Apr 1996 11:46:44)
Subject: Re: A Proper Cast for a Funtion Ptr....


Even in ANSI C, a function type cast may change the way values are
passed on the stack.  If and ANSI C function declares that it takes a
"short" or a "long", and you pass it the other type, the compiler is
allowed to perform an implicit type conversion when it codes a call to
that function.  For example, if you have a function that takes two
ints:

	void foo(int x, int y);

and you cast it to a function that takes two "long long"s:

	void foo(long long x, long long y);

the compiler will push 16 bytes (two 8-byte long-longs) instead of the
8 bytes (two ints) that the function is really expecting.

DJ