type t = key
The type of the hashtable keys.
val hash : t -> int
A hashing function on keys. It must be such that if two keys are equal according to
equal, then they have identical hash values as computed by
hash. Examples: suitable (
hash) pairs for arbitrary key types include
Hashtbl.hash) for comparing objects by structure (provided objects do not contain floats)
(fun x y -> compare x y = 0),
Hashtbl.hash) for comparing objects by structure and handling
Hashtbl.hash) for comparing objects by physical equality (e.g. for mutable or cyclic objects).