module type HashedType = sig .. end
The type of the hashtable keys.
let equal: (t, t) => bool;
The equality predicate used to compare keys.
let 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
Hashtbl.hash) for comparing objects by structure
(provided objects do not contain floats)
(fun x y -> compare x y = 0),
for comparing objects by structure
Hashtbl.hash) for comparing objects by physical
equality (e.g. for mutable or cyclic objects).