[Haskell-cafe] Boxed Mutable Arrays

[Alberto G. Corona]

AFAIK, ST Arrays are pure data structures. They are not really mutable. They
are destroyed and recreated on every update. The mutation is just simulated
thanks to the hidden state in the state monad. Sure, the garbage collector
must have a hard work in recycling all the "backbones" of the discarded
arrays (not the elements).

2009/12/14 Brad Larsen <brad.larsen at gmail.com>

> Is anyone working on fixing ticket #650
> <http://hackage.haskell.org/trac/ghc/ticket/650>?  In short, STArray
> and the garbage collector don't play well together, resulting in array
> updates being non-constant time operations.  This bug makes it very
> difficult/impossible to write efficient array algorithms that depend
> upon mutation in Haskell.
>
> On another note, does this (or perhaps better phrased, will this) bug
> also affect Data Parallel Haskell?
>
> I would really like to see highly efficient, mutable, boxed arrays in
> Haskell!  Unfortunately, I don't have the know-how to fix Ticket 650.
>
> Sincerely,
> Brad
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