[Haskell-cafe] Physical equality

José Romildo Malaquias j.romildo at gmail.com
Mon Jun 28 04:38:33 EDT 2010

Is there in Haskell a non monadic function of type a -> a -> Bool which
test for physical equality of two values? It would return True if only
if both values are the same object in memory.

For instance:

  value1 = "good"
  value2 = "good"

  eq value1 value2 => False

  value1 = "good"
  value2 = value1

  eq value1 value2 => True


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