CCHashtbl (containers.CCHashtbl)

include module type of Poly

val get : ('a, 'b) Hashtbl.t ‑> 'a ‑> 'b option

Safe version of Hashtbl.find.

val get_or : ('a, 'b) Hashtbl.t ‑> 'a ‑> default:'b ‑> 'b

get_or tbl k ~default returns the value associated to k if present, and returns default otherwise (if k doesn't belong in tbl).

Since: 0.16

val keys : ('a, 'b) Hashtbl.t ‑> 'a sequence

Iterate on keys (similar order as Hashtbl.iter).

val values : ('a, 'b) Hashtbl.t ‑> 'b sequence

Iterate on values in the table.

val keys_list : ('a, 'b) Hashtbl.t ‑> 'a list

keys_list t is the list of keys in t. If the key is in the Hashtable multiple times, all occurrences will be returned.

Since: 0.8

val values_list : ('a, 'b) Hashtbl.t ‑> 'b list

values_list t is the list of values in t.

Since: 0.8

val map_list : ('a ‑> 'b ‑> 'c) ‑> ('a, 'b) Hashtbl.t ‑> 'c list

Map on a hashtable's items, collect into a list.

val incr : ?⁠by:int ‑> ('a, int) Hashtbl.t ‑> 'a ‑> unit

incr ?by tbl x increments or initializes the counter associated with x. If get tbl x = None, then after update, get tbl x = Some 1; otherwise, if get tbl x = Some n, now get tbl x = Some (n+1).

Parameter by: if specified, the int value is incremented by by rather than 1.
Since: 0.16

val decr : ?⁠by:int ‑> ('a, int) Hashtbl.t ‑> 'a ‑> unit

Like incr but subtract 1 (or the value of by). If the value reaches 0, the key is removed from the table. This does nothing if the key is not already present in the table.

Since: 0.16

val to_seq : ('a, 'b) Hashtbl.t ‑> ('a * 'b) sequence

Iterate on bindings in the table.

val add_list : ('a, 'b list) Hashtbl.t ‑> 'a ‑> 'b ‑> unit

add_list tbl x y adds y to the list x is bound to. If x is not bound, it becomes bound to y.

Since: 0.16

val add_seq : ('a, 'b) Hashtbl.t ‑> ('a * 'b) sequence ‑> unit

Add the corresponding pairs to the table, using Hashtbl.add.

Since: 0.16

val of_seq : ('a * 'b) sequence ‑> ('a, 'b) Hashtbl.t

From the given bindings, added in order.

val add_seq_count : ('a, int) Hashtbl.t ‑> 'a sequence ‑> unit

add_seq_count tbl seq increments the count of each element of seq by calling incr. This is useful for counting how many times each element of seq occurs.

Since: 0.16

val of_seq_count : 'a sequence ‑> ('a, int) Hashtbl.t

Similar to add_seq_count, but allocates a new table and returns it.

Since: 0.16

val to_list : ('a, 'b) Hashtbl.t ‑> ('a * 'b) list

List of bindings (order unspecified).

val of_list : ('a * 'b) list ‑> ('a, 'b) Hashtbl.t

Build a table from the given list of bindings k_i -> v_i, added in order using add. If a key occurs several times, it will be added several times, and the visible binding will be the last one.

val update : ('a, 'b) Hashtbl.t ‑> f:('a ‑> 'b option ‑> 'b option) ‑> k:'a ‑> unit

update tbl ~f ~k updates key k by calling f k (Some v) if k was mapped to v, or f k None otherwise; if the call returns None then k is removed/stays removed, if the call returns Some v' then the binding k -> v' is inserted using Hashtbl.replace.

Since: 0.14

val get_or_add : ('a, 'b) Hashtbl.t ‑> f:('a ‑> 'b) ‑> k:'a ‑> 'b

get_or_add tbl ~k ~f finds and returns the binding of k in tbl, if it exists. If it does not exist, then f k is called to obtain a new binding v; k -> v is added to tbl and v is returned.

Since: 1.0

val pp : 'a printer ‑> 'b printer ‑> ('a, 'b) Hashtbl.t printer

Module CCHashtbl

Extension to the standard Hashtbl

Polymorphic tables

Functor