Talk:Physical equality
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Should the code not be
x === y = unsafePerformIO $ do
px <- x `seq` newStablePtr x
py <- y `seq` newStablePtr y
let ret = px == py
freeStablePtr px
freeStablePtr py
return ret
?
--David M, 20 Dec 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