From: Jon Harrop <jon@ffconsultancy.com>
To: caml-list@yquem.inria.fr
Subject: Pattern matching over lazy values
Date: Sat, 18 Aug 2007 15:57:31 +0100 [thread overview]
Message-ID: <200708181557.32056.jon@ffconsultancy.com> (raw)
Incidentally, would it not be enormously beneficial to be able to pattern
match over lazy values?
This syntax is never used:
# fun (x y) -> true;;
Syntax error: ')' expected, the highlighted '(' might be unmatched
so you can allow "lazy foo" as a pattern:
# let force (lazy n) = n;;
val force : 'a lazy_t -> 'a
and then make the pattern match force lazy values only as it comes across
them, so you can pattern match over lazy trees. I can't see any way to do
this without hacking the compiler...
--
Dr Jon D Harrop, Flying Frog Consultancy Ltd.
OCaml for Scientists
http://www.ffconsultancy.com/products/ocaml_for_scientists/?e
reply other threads:[~2007-08-18 15:08 UTC|newest]
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