David Kastrup <d...@gnu.org> writes: > Hi, I am wondering if I may compare pointers with < that have been > created using different calls of malloc. > > The C standard does not allow this (inequalities are only allowed for > pointers into the same structure) to allow for some cheapskate sort of > comparison in segmented architectures.
Hmm... if you were to implement a set of pointers in such a way that you can cheaply tell if an unknown pointer belongs to that set, you would use a hashtable, keyed with something that is derived from the value of the pointer casted to uintptr_t, I would think. Is such a use of ((uintptr_t)ptr) unallowed? If it is allowed, comparing two unrelated pointers after casting them to uintptr_t would equally be valid, I would have to think. -- To unsubscribe from this list: send the line "unsubscribe git" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
