On Mon, 20 Jul 2020 at 19:09, Thiago Macieira <thiago.macie...@intel.com> wrote: > > On Monday, 20 July 2020 08:40:06 PDT Oswald Buddenhagen wrote: > > On Mon, Jul 20, 2020 at 07:32:41AM -0700, Thiago Macieira wrote: > > >I am not going to accept a null-pointer dereference in there. The > > >static_cast<T *>(nullptr)-> must go. > > > > this this construct is actually UB is disputed on wikipedia (in the > > offsetof article). > > There's no dispute. It's a null-pointer dereference, so it's UB.
The member-access will not become valid. The only minor dispute is in http://open-std.org/JTC1/SC22/WG21/docs/cwg_active.html#232 but that will not make indirecting through a null pointer like that valid. The only dispute in the offsetof article is about whether that indirection is UB in C. In C++ it is, and will remain so. That's why C++-compliant stddef.h implementations don't do that. _______________________________________________ Development mailing list Development@qt-project.org https://lists.qt-project.org/listinfo/development
