Re: opaque pointers and metatype
- From: Cosmin Apreutesei <cosmin.apreutesei@xxxxxxxxx>
- To: luajit@xxxxxxxxxxxxx
- Date: Tue, 4 Mar 2014 04:01:28 +0200
> I don't think it can be done as long as you're missing the size.
I'm not missing the size, pthread_mutex_t is a pointer and it's size
is sizeof(pthread_mutex_t), i.e. sizeof(void*).
> Obviously the key difference is that the library itself has allocates
> storage.
Here too, the library allocates storage. It's just a difference in
style. Some APIs return an opaque* while others _take_ and opaque**
(two-stars), or an &opaque*, which is the same thing, and fill that
out.
> allocation. In this case`pthread_mutex_init` just initializes and
> assumes it has a big enough blob of memory.
pthread_mutex_init() assumes it has an address location to write to
and nothing more.
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