On 7 Jun 2013, at 16:29, Luboš Doležel <[email protected]> wrote: > for toll-free bridging in CoreBase, I need a way to detect whether the > incoming pointer is a small object encoded in a pointer and act accordingly > (treat it as an ObjC object and avoid reading it).
In objc/runtime.h, there is a constant SMALL_OBJECT_MASK. If ptr & SMALL_OBJECT_MASK == 0, then the pointer is not a small object. On 32-bit platforms, the low bit of the pointer will be 0. On 64-bit platforms, the low 3 bits will always be zero. David _______________________________________________ Gnustep-dev mailing list [email protected] https://lists.gnu.org/mailman/listinfo/gnustep-dev
