module type HashedType =
The type of the hashtable keys.
val equal :
t -> t -> bool
The equality predicate used to compare keys.
val hash :
t -> int
A hashing function on keys. It must be such that if two keys are
equal according to
, then they have identical hash values
as computed by
Examples: suitable (
) pairs for arbitrary key
) for comparing objects by structure,
(fun x y -> compare x y = 0)
for comparing objects by structure and handling
) for comparing objects by addresses
(e.g. for mutable or cyclic keys).