module type HashedType =sig
..end
The input signature of the functor MoreLabels.Hashtbl.Make
.
type
t
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 equal
, then they have identical hash values
as computed by hash
.
Examples: suitable (equal
, hash
) pairs for arbitrary key
types include
(=)
, MoreLabels.Hashtbl.HashedType.hash
) for comparing objects by structure
(provided objects do not contain floats)(fun x y -> compare x y = 0)
, MoreLabels.Hashtbl.HashedType.hash
)
for comparing objects by structure
and handling nan
correctly(==)
, MoreLabels.Hashtbl.HashedType.hash
) for comparing objects by physical
equality (e.g. for mutable or cyclic objects).