Re: Does newByteArray clear?

Bertram Felgenhauer via Glasgow-haskell-users <[email protected]> Thu, 27 Aug 2020 02:56:29 +0200

Newsgroups	gmane.comp.lang.haskell.glasgow.user
Message-ID	<20200827005629.GA24966@24f89f8c-e6a1-4e75-85ee-bb8a3743bb9f>

David Feuer wrote:
> I'm looking to play around with an array-based structure with
> sub-linear worst-case bounds. Array is pretty awkward in that context
> because creating a new one takes O(n) time to initialize it. Is that
> all true of newByteArray, or can I get one with arbitrary garbage in it
> for cheap?

newByteArray# does not actively clear memory.

However, for large arrays, I think the memory is likely to be freshly
allocated from the OS, and the OS will have cleared it for security
reasons.

Cheers,

Bertram
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