On 2020-02-03 09:23 +0100, aotto wrote: > Hi, > > there is an easy test, if Stefan is right and I'm wrong. > > 1. cast an INVALID Pointer to "aObj" > 2. call "method_base(&aObj->obj,...)" > > -> if stefan is right than "method_base" is called with an INVALID aObj > as Pointer > -> if I am right than your software will CRASH :-) If aObj is invalid, &aObj->obj would invoke undefined behavior. We can't predict what will happen so we shouldn't use &aObj->obj if aObj may be invalid. > that is the reason why I require the "frienddef". Then you should write to WG14 and try to convince them to add this to C2x. Or, simply use a pointer cast. If you think it looks ugly you can wrap it into some macros. -- Xi Ruoyao <xry111@xxxxxxxxxxxxxxxx> School of Aerospace Science and Technology, Xidian University
