Possible Bug - g++ 3.4.0 and GotW #17

[Jan Rendek]

Hi all,

While reading the Guru of the Week archive, more
precisly item 17. I tried the following code.

class  A             { public: virtual ~A(){} };
class  B : virtual A { public: virtual ~B(){} };
struct C : A         { /* EMPTY */ };
struct D : B, C      { /* EMPTY */ };

D d1;

int main()
{
  B* pb4 = &d1;
  A* pa1 = dynamic_cast<A*>(pb4); // (1)
}

According to H. Sutter the dynamic_cast (1) is correct
since "pb4 points to the object d1, and D does have A
as an indirect public base class (through C), and
dynamic_cast is able to cast across the inheritance
hierarchy using the path B* -> D* -> C* -> A*."

However using g++ 3.4.0 it fails to compile. Producing
the following error:
error: `A' is an inaccessible base of `B'

Am I missing something here, or shall I write bug report ?

--
Jan Rendek
INRIA Lorraine
r e n d e k @ l o r i a . f r