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Re: [Bug c++/15531] New: dynamic_cast fails (at runtime) when dependant on friendship of invoker
- From: Gabriel Dos Reis <gdr at integrable-solutions dot net>
- To: gcc-bugzilla at gcc dot gnu dot org
- Cc: gcc-bugs at gcc dot gnu dot org
- Date: 19 May 2004 00:21:20 +0200
- Subject: Re: [Bug c++/15531] New: dynamic_cast fails (at runtime) when dependant on friendship of invoker
- Organization: Integrable Solutions
- References: <20040518232016.15531.gccbugs@contacts.eelis.net>
"gccbugs at contacts dot eelis dot net" <gcc-bugzilla@gcc.gnu.org> writes:
| Consider the following snippet:
|
| struct Base
| {
| virtual ~Base () {}
| };
|
| class Derived : Base
| {
| friend int main ();
| };
|
| #include <cassert>
|
| int main ()
| {
| Base * p = new Derived;
|
| assert(dynamic_cast<Derived *>(p)); // fails
As required by the C++ standard. There is no way you can successfully
dynamic_cast from base class to derived class that does not publically
inherit.
| }
|
| When Derived is changed to publically inherit Base, the dynamic_cast succeeds.
Yes, that is what is required by the ISO C++ standard.
The PR is invalid.
-- Gaby