Re: avoiding copy - Luajit FFI

[Fabio Kaminski <fabiokaminski@...>]

On Tue, Jun 7, 2011 at 4:12 PM, Mike Pall <mikelu-1106@mike.de> wrote:
> Duncan Cross wrote:
>> On Tue, Jun 7, 2011 at 7:03 PM, Fabio Kaminski <fabiokaminski@gmail.com> wrote:
>> > but cast from void * to char * give me a new address (pointing to
>> > somewhere else) and not the same pointer:
>>
>> This is incorrect. What you are seeing here, when you print the
>> pointer, is not the value of the pointer itself but of the FFI cdata
>> object that has been allocated to house it.
>
> Well, I guess it's probably confusing. And inconsistent with e.g.
> arrays or structs, where the actual start address of the data is
> shown. 64 bit integers or complex numbers already show their value
> and not the (irrelevant) cdata object address, too.
>
> I've just changed it so tostring(pointer) shows the address the
> pointer points to. Much easier to spot NULL pointers, too.
>
> --Mike
>
>
cool feature!

also can't wait for function callbacks to arrive in a future release.. ;)

thanks