Re: [Caml-list] GC and file descriptors

[skaller <skaller@ozemail.com.au>]

On Wed, 2003-11-19 at 05:10, John J Lee wrote:
> On Tue, 19 Nov 2003, skaller wrote:
> > On Tue, 2003-11-18 at 23:05, Ville-Pertti Keinonen wrote:
> [...]
> > You haven't seen Python 2.2? Its a genuine functional
> > programming language now, with full lexical scoping,
> > closures, and even some advanced concepts like
> > iterators which cannot be programmed in Ocaml.
> [...]
> 
> Don't you mean generators?

Probably. You can write a function and yield a value
in the middle.. and then later continue on from
the yield point. The main use of such a beast
is to implement container iterators using
the closure state to maintain the position
in the container.

You can't do that (directly) in Ocaml.
Of course you can write:

	let make_f () =
		let state = ref 0 in	
		let f x = match !state with
		| 0 -> .... state := 6; retval1
		| 1 -> ...
	in f

but this is a real mess when you start nesting things...


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