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Today's Topics:
1. An unsigned int class. (derek riemer)
2. Re: An unsigned int class. (Brandon Allbery)
3. Re: An unsigned int class. (Marcin Mrotek)
4. Re: An unsigned int class. (David Obwaller)
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Message: 1
Date: Fri, 31 Jul 2015 09:30:35 -0600
From: derek riemer <[email protected]>
To: [email protected]
Subject: [Haskell-beginners] An unsigned int class.
Message-ID: <[email protected]>
Content-Type: text/plain; charset=utf-8; format=flowed
Is there anything in haskell that represents an unsigned Int class?
namely, something bounded below at 0? If not, is it possible to define
an Int in this way to add the bounded constraint (I can't immagine
trying to define Int like this, there has got to be a better way that I
haven't quite understood in my study of haskell).
data UnsignedInt = 0 | 1 | 2 | (...) for a long time doing that ...
deriving (Show, Eq, Ord, Bounded, Read)
Thanks,
Derek
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Message: 2
Date: Fri, 31 Jul 2015 11:32:45 -0400
From: Brandon Allbery <[email protected]>
To: The Haskell-Beginners Mailing List - Discussion of primarily
beginner-level topics related to Haskell <[email protected]>
Subject: Re: [Haskell-beginners] An unsigned int class.
Message-ID:
<CAKFCL4Wu_UTwHNm84K14y+7vL3xbriuF6A-WUbuXPz=yhdp...@mail.gmail.com>
Content-Type: text/plain; charset="utf-8"
On Fri, Jul 31, 2015 at 11:30 AM, derek riemer <[email protected]>
wrote:
> Is there anything in haskell that represents an unsigned Int class?
It's a type, not a class. "Class" implies something very different in
Haskell.
And I think you're looking for the "Word" type from Data.Word.
http://lambda.haskell.org/platform/doc/current/ghc-doc/libraries/haskell2010-1.1.1.0/Data-Word.html
--
brandon s allbery kf8nh sine nomine associates
[email protected] [email protected]
unix, openafs, kerberos, infrastructure, xmonad http://sinenomine.net
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Message: 3
Date: Fri, 31 Jul 2015 18:08:33 +0200
From: Marcin Mrotek <[email protected]>
To: The Haskell-Beginners Mailing List - Discussion of primarily
beginner-level topics related to Haskell <[email protected]>
Subject: Re: [Haskell-beginners] An unsigned int class.
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Hello,
If you're interested in numbers from 0 upto bignums, there's also
Numeric.Natural:
https://hackage.haskell.org/package/base-4.8.1.0/docs/Numeric-Natural.html
Best regards,
Marcin Mrotek
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Message: 4
Date: Fri, 31 Jul 2015 21:08:38 +0200
From: David Obwaller <[email protected]>
To: [email protected]
Subject: Re: [Haskell-beginners] An unsigned int class.
Message-ID: <20150731190838.GA8061@davids-mbp>
Content-Type: text/plain; charset=us-ascii
Hi,
On Fri, Jul 31, 2015 at 09:30:35AM -0600, derek riemer wrote:
> Is there anything in haskell that represents an unsigned Int class?
> namely, something bounded below at 0?
The module Data.Word provides unsigned integral types with
modular arithmetic: Word (same size as Int), Word8, Word16,
etc.
$ ghci
> import Data.Word
...
> maxBound :: Word
18446744073709551615
> maxBound :: Word8
255
> maxBound :: Word32
4294967295
> 0 - 1 :: Word8
255
> maxBound + 1 :: Word8
0
Is that what you are looking for?
http://hackage.haskell.org/package/base-4.8.1.0/docs/Data-Word.html
David
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