Re: [pure-lang-users] C macros

[Albert G. <Dr....@t-...>]

Eddie Rucker wrote:
> Great. MACROS :)

Better yet: HYGIENIC macros. :-P

I'm falling asleep at the keyboard (past 2:30am over here), will reply 
to your questions in more detail tomorrow. Just some quick remarks:

- You can make a C function fail, but only if it returns an expr* 
(pure_expr* on the C side), then you can just return a null pointer. So 
you need to provide a wrapper for the GSL function which returns a real 
pure_expr*, that's probably not what you want I guess. But for hard 
error conditions like alloc failure it would be ok to just throw a Pure 
exception, no?

- I'd eventually like the GSL matrices to be some kind of native type in 
Pure if possible. For the time being, I'd suggest to wrap them up in a 
Pure constructor (matrix p or something like that where p is the pointer 
to the GSL struct or whatever it is).

- Accessing the fields of a struct through pointers in Pure is possible 
(see the stuff at the end of primitives.pure), but probably 
non-portable. You'd probably need some getter/setter functions in your 
wrapper to do that in a safe way.

G'night,
Albert

-- 
Dr. Albert Gr"af
Dept. of Music-Informatics, University of Mainz, Germany
Email:  Dr....@t-..., ag...@mu...
WWW:    http://www.musikinformatik.uni-mainz.de/ag