Module CCTrie.Make

Parameters

• W : WORD

Signature

type char_ = W.char_

type key = W.t

type 'a t

val empty : 'a t

val is_empty : _ t -> bool

val add : key -> 'a -> 'a t -> 'a t

Add a binding to the trie (possibly erasing the previous one).

val remove : key -> 'a t -> 'a t

Remove the key, if present.

val find : key -> 'a t -> 'a option

Find the value associated with the key, if any.

val find_exn : key -> 'a t -> 'a

Same as find but can fail.

raises Not_found

if the key is not present.

val longest_prefix : key -> 'a t -> key

longest_prefix k m finds the longest prefix of k that leads to at least one path in m (it does not mean that the prefix is bound to a value.

Example: if m has keys "abc0" and "abcd", then longest_prefix "abc2" m will return "abc".

since

0.17

val update : key -> ('a option -> 'a option) -> 'a t -> 'a t

Update the binding for the given key. The function is given None if the key is absent, or Some v if key is bound to v; if it returns None the key is removed, otherwise it returns Some y and key becomes bound to y.

val fold : ('b -> key -> 'a -> 'b) -> 'b -> 'a t -> 'b

Fold on key/value bindings. Will use WORD.of_list to rebuild keys.

val mapi : (key -> 'a -> 'b) -> 'a t -> 'b t

Map values, giving both key and value. Will use WORD.of_list to rebuild keys.

since

0.17

val map : ('a -> 'b) -> 'a t -> 'b t

Map values, giving only the value.

since

0.17

val iter : (key -> 'a -> unit) -> 'a t -> unit

Same as fold, but for effectful functions.

val fold_values : ('b -> 'a -> 'b) -> 'b -> 'a t -> 'b

More efficient version of fold, that doesn't keep keys.

val iter_values : ('a -> unit) -> 'a t -> unit

val merge : ('a -> 'a -> 'a option) -> 'a t -> 'a t -> 'a t

Merge two tries together. The function is used in case of conflicts, when a key belongs to both tries.

val size : _ t -> int

Number of bindings.