Re: C API question

[Drake Wilson <drake@...>]

Quoth Sam Roberts <vieuxtech@gmail.com>, on 2011-01-09 09:49:13 -0800:
> > And this doesn't solve the problem for modules and other sorts of libraries.
> 
> Trying to guess what the "the problem" is, but for a module, you'd use
> a lightuserdata of a pointer to something in your modules C
> implementation, the module function, a static variable. C doesn't put
> multiple things at the same pointer address, so it will be unique.

Note that last I checked, ISO C proper doesn't guarantee much along
those lines for function pointers.  (I think they're not even
guaranteed to be castable to void *.)  So declaring a separate char or
int dummy variable is probably best in the general case; the extra few
bytes of memory are a small price to pay for a nice clean pointer
unless you're on a seriously memory-starved system.

> Sam

   ---> Drake Wilson