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
2010/6/28 José Romildo Malaquias j.romi...@gmail.com:
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
On 28 Jun 2010, at 09:38, 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.
For instance:
value1 = good
value2 = good
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
reallyUnsafePointerEquality :: a - a - Int#
but don't use as it can give both false negatives (i.e. GC in the middle of
evaluation) and false positives (that GC just finished and put one object
right where the other was.)
The better model to obtain what you want to use StableNames and seq and,
