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On Tue, Mar 8, 2011 at 11:30 AM, liam mail <> wrote:
> Just a note to say that a function pointer and void pointer have
> no guarantees to be the same size.

If that is an issue for the OP, don't use lightuserdata, an alternate
technique is to use the fn ptr value encoded as a hex string.

While ANSI allows sizeof(void (*)()) to be > sizeof(void*), its pretty
unusual (I've never seen it). IIRC, traditional/pre-ANSI C required
any ptr, including functions pointers, to be castable to void* without