mirror of
https://github.com/c-cube/ocaml-containers.git
synced 2025-12-06 03:05:28 -05:00
large refactor of CCHash, main type is now 'a -> int
This commit is contained in:
Simon Cruanes
parent
8ad0dce97b
commit
8aab182642
2 changed files with 78 additions and 75 deletions
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@ -3,67 +3,72 @@
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(** {1 Hash combinators} *)
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type t = int
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type hash = int
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type 'a t = 'a -> hash
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type 'a sequence = ('a -> unit) -> unit
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type 'a gen = unit -> 'a option
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type 'a klist = unit -> [`Nil | `Cons of 'a * 'a klist]
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type state = int
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type 'a hash_fun = 'a -> state -> state
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let combine f x s = Hashtbl.seeded_hash s (f x)
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let combine f s x = Hashtbl.seeded_hash s (f x)
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let combine2 a b = Hashtbl.seeded_hash a b
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let init : state = 0
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let finish i = i
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let combine3 a b c =
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combine2 (combine2 a b) c
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let apply f x = f x init
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let combine4 a b c d =
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combine2 (combine2 a b) (combine2 c d)
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(** {2 Combinators} *)
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let int i s = combine2 s (Int64.of_int i)
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let bool x s = combine2 s (if x then 1L else 2L)
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let char x s = combine2 s (Int64.of_int (Char.code x))
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let int32 x s = combine2 s (Int64.of_int32 x)
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let int64 x s = combine2 s x
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let nativeint x s = combine2 s (Int64.of_nativeint x)
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let const h _ = h
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let slice x i len s =
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let int i = i land max_int
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let bool b = if b then 1 else 2
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let char x = Char.code x
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let int32 (x:int32) = Hashtbl.hash x
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let int64 (x:int64) = Hashtbl.hash x
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let nativeint (x:nativeint) = Hashtbl.hash x
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let string (x:string) = Hashtbl.hash x
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let slice x i len =
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let j=i+len in
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let rec aux i s =
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if i=j then s else aux (i+1) (char x.[i] s)
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if i=j then s else aux (i+1) (combine2 (char x.[i]) s)
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in
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aux i s
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aux i 0
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let rec list f l s = match l with
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| [] -> s
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| x::l' -> list f l' (f x s)
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let opt f = function
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| None -> 42
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| Some x -> combine2 43 (f x)
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let array f a s = Array.fold_right f a s
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let list f l = List.fold_left (combine f) 0x42 l
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let array f l = Array.fold_left (combine f) 0x42 l
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let opt f o h = match o with
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| None -> h
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| Some x -> f x h
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let pair h1 h2 (x,y) s = h2 y (h1 x s)
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let triple h1 h2 h3 (x,y,z) s = h3 z (h2 y (h1 x s))
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let string x s = slice x 0 (String.length x) s
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let pair f g (x,y) = combine2 (f x) (g y)
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let triple f g h (x,y,z) = combine2 (combine2 (f x) (g y)) (h z)
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let quad f g h i (x,y,z,w) = combine2 (combine2 (f x) (g y)) (combine2 (h z) (i w))
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let if_ b then_ else_ h =
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if b then then_ h else else_ h
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let seq f seq s =
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let s = ref s in
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seq (fun x -> s := f x !s);
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!s
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let poly x = Hashtbl.hash x
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let rec gen f g s = match g () with
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| None -> s
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| Some x -> gen f g (f x s)
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let seq f seq =
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let h = ref 0x43 in
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seq (fun x -> h := combine f !h x);
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!h
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let rec klist f l s = match l () with
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| `Nil -> s
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| `Cons (x,l') -> klist f l' (f x s)
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let gen f g =
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let rec aux s = match g () with
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| None -> s
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| Some x -> aux (combine2 s (f x))
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in aux 0x42
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let klist f l =
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let rec aux l s = match l () with
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| `Nil -> s
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| `Cons (x,tail) -> aux tail (combine2 s (f x))
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in aux l 0x42
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@ -5,56 +5,54 @@
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(** {2 Definitions} *)
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type t = int
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type hash = int
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(** A hash value is a positive integer *)
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type state
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type 'a t = 'a -> hash
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(** A hash function for values of type ['a] *)
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type 'a hash_fun = 'a -> state -> state
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(** Hash function for values of type ['a], merging a fingerprint of the
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value into the state of type [t] *)
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val const : hash -> _ t
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(** [return h] hashes any value into [h]. Use with caution!. *)
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val init : state
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(** Initial value *)
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val finish : state -> int
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(** Extract a usable hash value *)
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val apply : 'a hash_fun -> 'a -> int
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(** Apply a hash function to a value.
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[apply f x] is the same as [finish (f x init)] *)
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val int : int hash_fun
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val bool : bool hash_fun
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val char : char hash_fun
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val int32 : int32 hash_fun
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val int64 : int64 hash_fun
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val nativeint : nativeint hash_fun
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val slice : string -> int -> int hash_fun
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val int : int t
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val bool : bool t
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val char : char t
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val int32 : int32 t
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val int64 : int64 t
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val nativeint : nativeint t
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val slice : string -> int -> int t
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(** [slice s i len state] hashes the slice [i, ... i+len-1] of [s]
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into [state] *)
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val combine : ('a -> int) -> 'a hash_fun
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val string : string t
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val string : string hash_fun
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val list : 'a t -> 'a list t
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val array : 'a t -> 'a array t
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val opt : 'a t -> 'a option t
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val pair : 'a t -> 'b t -> ('a * 'b) t
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val triple : 'a t -> 'b t -> 'c t -> ('a * 'b * 'c) t
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val quad : 'a t -> 'b t -> 'c t -> 'd t -> ('a * 'b * 'c * 'd) t
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val list : 'a hash_fun -> 'a list hash_fun
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val array : 'a hash_fun -> 'a array hash_fun
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val opt : 'a hash_fun -> 'a option hash_fun
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val pair : 'a hash_fun -> 'b hash_fun -> ('a * 'b) hash_fun
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val triple : 'a hash_fun -> 'b hash_fun -> 'c hash_fun -> ('a * 'b * 'c) hash_fun
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val if_ : bool -> 'a hash_fun -> 'a hash_fun -> 'a hash_fun
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val if_ : bool -> 'a t -> 'a t -> 'a t
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(** Decide which hash function to use depending on the boolean *)
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val poly : 'a t
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(** the regular polymorphic hash function *)
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(** {2 Base hash combinators} *)
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val combine : 'a t -> hash -> 'a -> hash
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val combine2 : hash -> hash -> hash
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val combine3 : hash -> hash -> hash -> hash
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val combine4 : hash -> hash -> hash -> hash -> hash
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(** {2 Iterators} *)
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type 'a sequence = ('a -> unit) -> unit
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type 'a gen = unit -> 'a option
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type 'a klist = unit -> [`Nil | `Cons of 'a * 'a klist]
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val seq : 'a hash_fun -> 'a sequence hash_fun
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val gen : 'a hash_fun -> 'a gen hash_fun
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val klist : 'a hash_fun -> 'a klist hash_fun
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val seq : 'a t -> 'a sequence t
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val gen : 'a t -> 'a gen t
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val klist : 'a t -> 'a klist t
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