Difference between revisions of "Talk:Physical equality"
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| − | Should the code not be |
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| − | <haskell> |
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| − | x === y = unsafePerformIO $ do |
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| − | px <- x `seq` newStablePtr x |
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| − | py <- y `seq` newStablePtr y |
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| − | let ret = px == py |
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| − | freeStablePtr px |
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| − | freeStablePtr py |
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| − | return ret |
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| − | </haskell> |
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| − | ? |
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| − | |||
| − | --David M, 20 Dec 2010 |
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GHC already has physical equality testing via GHC.Exts.reallyUnsafePtrEquality# |
GHC already has physical equality testing via GHC.Exts.reallyUnsafePtrEquality# |
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Latest revision as of 19:20, 20 December 2010
GHC already has physical equality testing via GHC.Exts.reallyUnsafePtrEquality#
--Lemmih 15:00, 29 July 2006 (UTC)
No need to talk about OCaml's nan:
Prelude> 0/0
NaN
Prelude> 0/0 == 0/0
False