https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70620
--- Comment #3 from Zhendong Su <su at cs dot ucdavis.edu> --- (In reply to Jonathan Wakely from comment #2) > Your code is equivalent to: > > delete reinterpret_cast<D *>(static_cast<B1 *>(new E)); > > which means the conversion is not done safely, and you get a D* that doesn't > point to the D subobject. > > Compare: > > E* e = new E; > std::cout << (D*)e << '\n' << (B1*)e << '\n' << (D*)(B1*)e << '\n'; > > The expression (D*)(B1*)e is not the same as (D*)e, i.e. it does not produce > the address of the D subobject. Thanks Jonathan. That's what I had thought, but the change in behavior caused me to wonder.
