Path: utzoo!utgpu!watserv1!watmath!att!dptg!ulysses!andante!alice!ark
From: ark@alice.UUCP (Andrew Koenig)
Newsgroups: comp.lang.c++
Subject: Re: polymorfism on objects, not pointers
Keywords: polymorfism dynamic binding
Message-ID: <11019@alice.UUCP>
Date: 5 Jul 90 15:03:09 GMT
References: <631@atcmpe.atcmp.nl>
Organization: AT&T Bell Laboratories, Liberty Corner NJ
Lines: 20

In article <631@atcmpe.atcmp.nl>, leo@atcmp.nl (Leo  Willems) writes:

> In the example below ::g() accepts a class B variable (not a pointer/reference)
> If g() is called with a D (derived from B) the virtual mechanism works!

> 	B bb;
> 	D dd;

> 	g(dd);		//see end of posting for complete code

> In C++ 1.2 this didn't work (compile time error: can not make a B from a D)
> but in 2.0 it is possible to make a B from a D but as I understand it that
> should not alter the B behaviour, and so no runtime binding is expected.

It's a bug in C++ 2.0, fixed in 2.1


-- 
				--Andrew Koenig
				  ark@europa.att.com