Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Path: utzoo!utgpu!water!pabuhr
From: pabuhr@water.UUCP
Newsgroups: comp.lang.c++
Subject: BUG
Message-ID: <1131@water.waterloo.edu>
Date: Mon, 28-Sep-87 22:05:29 EDT
Article-I.D.: water.1131
Posted: Mon Sep 28 22:05:29 1987
Date-Received: Tue, 29-Sep-87 04:47:16 EDT
Reply-To: pabuhr@water.UUCP ()
Distribution: world
Organization: U. of Waterloo, Ontario
Lines: 61

/*
It took me 4 hours to locate this problem in a large program.
If you look at the C++ code generated for the inline procedure
`identity', you will notice that it has been optimized into the
same single constant! I need a drink.
*/

class test {
    public:
	inline int identity(test *);
};

inline int test::identity(test *h) {
	if (this != h) {
		return(0);
	} else {
		return(1);
	}
};

main() {
	test a, b;

	a.identity(&a);
	a.identity(&b);
}

================================= C++ output
cd /u/pabuhr/sm/string/
ccc -F test.cc
#line 1 "test.cc"

/* <<cfront 1.2.1 2/16/87>> */
/* < test.cc */
char *_new(); char _delete(); char *_vec_new(); char _vec_delete();

#line 1 "test.cc"

#line 8 "test.cc"
struct test {	/* sizeof test == 1 */
char _dummy; };

#line 13 "test.cc"

#line 21 "test.cc"
int main (){ _main(); { 
#line 22 "test.cc"
struct test _au1_a ;

#line 22 "test.cc"
struct test _au1_b ;

#line 24 "test.cc"
( (1 )) ;            <=== where's the beef ???
( (1 )) ;            <=== where's the beef ???
}
};

/* the end */

Compilation finished at Mon Sep 28 21:53:05