On 22/07/2009, at 9:16 AM, Christian Klauser wrote:
Thank you, works indeed with the strict ST monad. Didn't think of
that. But
makes kind of sense not to define these instances, since unboxed
values
cannot have their computation delayed. It's a bit unfortunate,
however, that
a single use
of an unboxed array "forces" the whole state thread to become strict.
Hmm. Have you seen the strictToLazyST function?
http://www.haskell.org/ghc/docs/latest/html/libraries/base/Control-Monad-ST-Lazy.html#v%3AstrictToLazyST
cheers
peter
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