Hi ,

 I am trying to write OCaml interfaces around a C library.  I tried
looking at the Unix library and trying to understand it. However, I have
much complex data types to deal with.I was wondering if anyone could help
me out. 

Here is a signature of one of the C functions:

an_flow_t * 
an_flow_create(void *mem, an_cred_t *cred, an_cpuspec_t *cspec,
		an_memspec_t *mspec, an_flowinit_func_t init, 
		void *initarg, an_flowterm_func_t term)


Each of these types are complex structures in C. How do I represent these
in OCaml. Is it useful to use classes and methods? Or do I use abstract
types to represent them ?

An example of one of these structures is given below:

struct an_flow_t {
  struct hnode me; 	  /* flow hier link (must be first) */
  struct ani_cred *cred;  /* credentials */
  struct ani_mempool *mpool;  /* mempool */
  struct ani_chan *chanlist;  /* list of channels */
  struct ani_threadpool tpool;  /* thread pool */
  int flags;  /* various flags */
  an_flowterm_func_t termfunc; /* termination function */
  ani_resource_t res;  /* reserved resources */
  int refs;  /* reference count */
  ani_ilock_t lock;  /* mutual exclusion */
  an_flowstats_t stats;  /* statistics */
};   


I would be grateful for any help.

Thanks
Ravi

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