http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52327
Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution| |INVALID
--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> 2012-02-21
17:04:06 UTC ---
To quote the standard, [class.base.init] p7 says
"A mem-initializer where the mem-initializer-id denotes a virtual base class is
ignored during execution of a constructor of any class that is not the most
derived class."
So when Top is not the most-derived class, the mem-initializers in Top's copy
constructor are ignored, and the virtual bases get default-constructed.
c.f. http://www.parashift.com/c++-faq/multiple-inheritance.html#faq-25.12
