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String keys of a given fixed size in bytes.


module L : sig ... end


type t = string

The type for keys.

val t : t Repr.t
val equal : t -> t -> bool

The equality function for keys.

val hash : t -> int

Note: Unevenly distributed hash functions may result in performance drops.

val hash_size : int

The number of bits necessary to encode the maximum output value of hash. `Hashtbl.hash` uses 30 bits.

Overestimating the hash_size will result in performance drops; underestimation will result in undefined behavior.

val encode : t -> string

encode is an encoding function. The resultant encoded values must have size encoded_size.

val encoded_size : int

encoded_size is the size of the result of encode, expressed in number of bytes.

val decode : string -> int -> t

decode s off is the decoded form of the encoded value at the offset off of string s. Must satisfy decode (encode t) 0 = t.