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From: jfw@rome.wpd.sgi.com (john fergus wilkinson)
Newsgroups: comp.lang.c++
Subject: Re: Direct derivation of virtual base
Message-ID: <1990Nov21.230629.25457@odin.corp.sgi.com>
Date: 21 Nov 90 23:06:29 GMT
References: <1990Nov19.211251.13416@ssd.kodak.com>
Sender: news@odin.corp.sgi.com (Net News)
Reply-To: jfw@rome.wpd.sgi.com (john fergus wilkinson)
Distribution: usa
Organization: Silicon Graphics, Inc., Mountain View, CA.
Lines: 46

In article <1990Nov19.211251.13416@ssd.kodak.com>,
randolph@ssd.kodak.com (Gary L. Randolph) writes:
> 

> The following code results in the compile time error:
>    "tst.C", line 31: 
>         error:  main() cannot access f : X  is a private base class
> 
> WHY????????
> 
> 
> #include <iostream.h>
> 
> class X{
>         public:
>         virtual void f();
> };
> 
> class Y : virtual private X{
> 
> 
> };
> 
> class Z : virtual private X{
> 
> 
> };
> 
> class XYZ : public Y, public Z, virtual public X{
> };
> 
> 
> void X::f()
>         {
>         cout<<"\nX::f() ";
>         }
> 
> int main(){
> 	XYZ * xyzp = new XYZ;
> 	xyzp->f();                 //LINE 31
> }
> 
> 

According to the Annotated Reference Manual (Section 11.7), this is a
bug, and in fact it is fixed in cfront 2.1.