On Sat, 2004-10-09 at 18:35, Keith Wansbrough wrote:
> > So there is actually a good argument for a Stream
> > module with hd and tl functions (and lazy map ..)
> 
> Even lazy map shouldn't do cycle-detection, though: I would expect a
> cyclic stream to be mapped to an infinite one.

Yes, what I meant was that for a data type s:'a stream,
and a function f: 'a -> 'b, the function

	map f s : 'b stream

creates a new stream represented by the pair

	(f,s)

with hd (f,s) = f (hd s). In other words, the map is only
applied when you fetch an element.

-- 
John Skaller, mailto:skaller@users.sf.net
voice: 061-2-9660-0850, 
snail: PO BOX 401 Glebe NSW 2037 Australia
Checkout the Felix programming language http://felix.sf.net



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