[Haskell-cafe] Physical equality

[Sönke Hahn]

On Monday, June 28, 2010 10:38:33 am José Romildo Malaquias wrote:
> 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.

IIRC "observable sharing" does similar things.
Sönke

> 
> For instance:
> 
>   value1 = "good"
>   value2 = "good"
> 
>   eq value1 value2 => False
> 
>   value1 = "good"
>   value2 = value1
> 
>   eq value1 value2 => True
> 
> Romildo
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