Path: utzoo!attcan!uunet!mcsun!ukc!warwick!laucy
From: laucy@warwick.ac.uk (TS Wong)
Newsgroups: comp.lang.c++
Subject: Problem on virtual function.
Message-ID: <485@lily.warwick.ac.uk>
Date: 13 Apr 90 21:30:42 GMT
Reply-To: laucy@warwick.ac.uk (TS Wong)
Organization: Computing Services, Warwick University, UK
Lines: 33

The compiler give me a strange error message (I haven't acturally got
any constructor inside the class definition.) when I compile the
following code. The message will disappear if the virtual declaration is
removed. Is it a bug, or when we declare a virtual function a
invisibly constructor is created? Can anyone told me why?

Thanks in advance.

N.B. I'm using AT&T C++ Ver.2.0
CC  t.c:
"t.c", line 10: error:  member c::test of class a with constructor in union
1 error

---------------------------------
#include <stream.h>
class a {
public:
    virtual void test() {
	cout << "Hello" ;
    }
} ;

union c {
    a test ;
} ;

main()
{
    c f ;
}

-------------------------------
laucy@uk.ac.warwick.cu