Re: [Haskell-cafe] Physical equality

2010/6/28 José Romildo Malaquias :

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

Not exactly what you ask for, but quite close: http://www.haskell.org/ghc/docs/6.12.1/html/libraries/base/System-Mem-Stable... Cheers, Thu