Path: utzoo!censor!geac!torsqnt!news-server.csri.toronto.edu!bonnie.concordia.ca!uunet!fernwood!lia!steve
From: steve@lia (Stephen Williams)
Newsgroups: comp.lang.c++
Subject: Bug in multiple inheritence
Summary: Caste reference to derived class to a base class breaks.
Message-ID: <1991Jan11.193846.12505@lia>
Date: 11 Jan 91 19:38:46 GMT
References: <1991Jan7.153341.29504@slcs.slb.com>
Reply-To: steve@lia.com (Stephen Williams)
Organization: Litton/Integrated Automation, Alameda, California
Lines: 25


The following program demonstrates an apparent bug in C++ 2.0 and 2.1.
Am I seeing things?


class X { int x, y; };
class Y { int a, b; };
class Mess  : public X, public Y { int m; };


main()
{
	Mess m;
	Mess &n = m;

	X x = n;
	Y y = n;	// <---- C++ Error!!!!  In this case y should get the
		// Y part of n, but is instead getting the X part.
		// An offset is missing.


	X &xp = n;
	Y &yp = n;	// <---- Works.  In this case the correct code
			// is generated.
}