Talk:Physical equality

(Difference between revisions)

Current revision

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

@@ Line 1: / Line 1: @@
-Should the code not be
-<haskell>
-x === y = unsafePerformIO $ do
-    px <- x `seq` newStablePtr x
-    py <- y `seq` newStablePtr y
-    let ret = px == py
-    freeStablePtr px
-    freeStablePtr py
-    return ret
-</haskell>
-?
---David M, 20 Dec 2010
 GHC already has physical equality testing via GHC.Exts.reallyUnsafePtrEquality#