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c++/3706: covariant returns and virtual inheritance
- To: gcc-gnats at gcc dot gnu dot org
- Subject: c++/3706: covariant returns and virtual inheritance
- From: j dot hannemann at ieee dot org
- Date: 17 Jul 2001 09:38:42 -0000
- Reply-To: j dot hannemann at ieee dot org
>Number: 3706
>Category: c++
>Synopsis: covariant returns and virtual inheritance
>Confidential: no
>Severity: serious
>Priority: medium
>Responsible: unassigned
>State: open
>Class: rejects-legal
>Submitter-Id: net
>Arrival-Date: Tue Jul 17 02:46:04 PDT 2001
>Closed-Date:
>Last-Modified:
>Originator: Jens Hannemann
>Release: 3.0
>Organization:
>Environment:
System: SunOS dortmund 5.6 Generic_105181-05 sun4u sparc SUNW,Ultra-60
Architecture: sun4
host: sparc-sun-solaris2.6
build: sparc-sun-solaris2.6
target: sparc-sun-solaris2.6
configured with: ../gcc-3.0/configure --prefix=/usr/local/gcc3
>Description:
When using covariant returns (such as in "virtual constructors")
in conjunction with virtual inheritance, g++ gives the error:
"foo.cpp:8: sorry, not implemented: adjusting pointers for covariant returns"
Behavior for non-virtual inheritance is correct.
I tried this with gcc 2.95.3, gcc 3.0 and the latest snapshot using CodeSourcery's
online compiler as of July 17, 2001.
>How-To-Repeat:
class A
{
public:
virtual A* clone() const = 0;
};
class B: public virtual A
{
public:
virtual B* clone() const {return(new B(*this));}
};
int main()
{
B* b = new B;
B* c = b->clone();
return 0;
}
>Fix:
>Release-Note:
>Audit-Trail:
>Unformatted: