mirror of
https://github.com/c-cube/ocaml-containers.git
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213 lines
7.7 KiB
OCaml
213 lines
7.7 KiB
OCaml
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(* This file is free software, part of containers. See file "license" for more details. *)
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(** {1 Extension to the standard Hashtbl}
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@since 0.4 *)
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type 'a sequence = ('a -> unit) -> unit
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type 'a eq = 'a -> 'a -> bool
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type 'a hash = 'a -> int
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type 'a printer = Format.formatter -> 'a -> unit
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(** {2 Polymorphic tables} *)
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(** This sub-module contains the extension of the standard polymorphic hashtbl. *)
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module Poly : sig
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val get : ('a,'b) Hashtbl.t -> 'a -> 'b option
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(** Safe version of {!Hashtbl.find} *)
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val get_or : ('a,'b) Hashtbl.t -> 'a -> default:'b -> 'b
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(** [get_or tbl k ~default] returns the value associated to [k] if present,
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and returns [default] otherwise (if [k] doesn't belong in [tbl])
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@since 0.16 *)
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val keys : ('a,'b) Hashtbl.t -> 'a sequence
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(** Iterate on keys (similar order as {!Hashtbl.iter}) *)
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val values : ('a,'b) Hashtbl.t -> 'b sequence
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(** Iterate on values in the table *)
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val keys_list : ('a, 'b) Hashtbl.t -> 'a list
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(** [keys_list t] is the list of keys in [t].
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@since 0.8 *)
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val values_list : ('a, 'b) Hashtbl.t -> 'b list
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(** [values_list t] is the list of values in [t].
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@since 0.8 *)
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val map_list : ('a -> 'b -> 'c) -> ('a, 'b) Hashtbl.t -> 'c list
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(** Map on a hashtable's items, collect into a list *)
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val incr : ?by:int -> ('a, int) Hashtbl.t -> 'a -> unit
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(** [incr ?by tbl x] increments or initializes the counter associated with [x].
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If [get tbl x = None], then after update, [get tbl x = Some 1];
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otherwise, if [get tbl x = Some n], now [get tbl x = Some (n+1)].
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@param by if specified, the int value is incremented by [by] rather than 1
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@since 0.16 *)
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val decr : ?by:int -> ('a, int) Hashtbl.t -> 'a -> unit
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(** Same as {!incr} but substract 1 (or the value of [by]).
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If the value reaches 0, the key is removed from the table.
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This does nothing if the key is not already present in the table.
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@since 0.16 *)
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val to_seq : ('a,'b) Hashtbl.t -> ('a * 'b) sequence
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(** Iterate on bindings in the table *)
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val add_list : ('a, 'b list) Hashtbl.t -> 'a -> 'b -> unit
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(** [add_list tbl x y] adds [y] to the list [x] is bound to. If [x] is
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not bound, it becomes bound to [[y]].
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@since 0.16 *)
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val add_seq : ('a,'b) Hashtbl.t -> ('a * 'b) sequence -> unit
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(** Add the corresponding pairs to the table, using {!Hashtbl.add}.
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@since 0.16 *)
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val of_seq : ('a * 'b) sequence -> ('a,'b) Hashtbl.t
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(** From the given bindings, added in order *)
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val add_seq_count : ('a, int) Hashtbl.t -> 'a sequence -> unit
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(** [add_seq_count tbl seq] increments the count of each element of [seq]
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by calling {!incr}. This is useful for counting how many times each
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element of [seq] occurs.
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@since 0.16 *)
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val of_seq_count : 'a sequence -> ('a, int) Hashtbl.t
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(** Similar to {!add_seq_count}, but allocates a new table and returns it
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@since 0.16 *)
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val to_list : ('a,'b) Hashtbl.t -> ('a * 'b) list
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(** List of bindings (order unspecified) *)
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val of_list : ('a * 'b) list -> ('a,'b) Hashtbl.t
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(** Build a table from the given list of bindings [k_i -> v_i],
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added in order using {!add}. If a key occurs several times,
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it will be added several times, and the visible binding
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will be the last one. *)
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val update : ('a, 'b) Hashtbl.t -> f:('a -> 'b option -> 'b option) -> k:'a -> unit
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(** [update tbl ~f ~k] updates key [k] by calling [f k (Some v)] if
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[k] was mapped to [v], or [f k None] otherwise; if the call
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returns [None] then [k] is removed/stays removed, if the call
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returns [Some v'] then the binding [k -> v'] is inserted
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using {!Hashtbl.replace}
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@since 0.14 *)
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val get_or_add : ('a, 'b) Hashtbl.t -> f:('a -> 'b) -> k:'a -> 'b
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(** [get_or_add tbl ~k ~f] finds and returns the binding of [k]
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in [tbl], if it exists. If it does not exist, then [f k]
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is called to obtain a new binding [v]; [k -> v] is added
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to [tbl] and [v] is returned.
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@since 1.0 *)
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val pp : 'a printer -> 'b printer -> ('a, 'b) Hashtbl.t printer
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(** Printer for table
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@since 0.13
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Renamed from [print] @since 2.0 *)
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end
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include module type of Poly
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(** {2 Functor} *)
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module type S = sig
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include Hashtbl.S
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val get : 'a t -> key -> 'a option
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(** Safe version of {!Hashtbl.find} *)
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val get_or : 'a t -> key -> default:'a -> 'a
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(** [get_or tbl k ~default] returns the value associated to [k] if present,
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and returns [default] otherwise (if [k] doesn't belong in [tbl])
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@since 0.16 *)
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val add_list : 'a list t -> key -> 'a -> unit
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(** [add_list tbl x y] adds [y] to the list [x] is bound to. If [x] is
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not bound, it becomes bound to [[y]].
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@since 0.16 *)
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val incr : ?by:int -> int t -> key -> unit
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(** [incr ?by tbl x] increments or initializes the counter associated with [x].
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If [get tbl x = None], then after update, [get tbl x = Some 1];
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otherwise, if [get tbl x = Some n], now [get tbl x = Some (n+1)].
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@param by if specified, the int value is incremented by [by] rather than 1
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@since 0.16 *)
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val decr : ?by:int -> int t -> key -> unit
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(** Same as {!incr} but substract 1 (or the value of [by]).
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If the value reaches 0, the key is removed from the table.
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This does nothing if the key is not already present in the table.
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@since 0.16 *)
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val keys : 'a t -> key sequence
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(** Iterate on keys (similar order as {!Hashtbl.iter}) *)
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val values : 'a t -> 'a sequence
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(** Iterate on values in the table *)
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val keys_list : _ t -> key list
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(** [keys t] is the list of keys in [t].
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@since 0.8 *)
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val values_list : 'a t -> 'a list
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(** [values t] is the list of values in [t].
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@since 0.8 *)
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val map_list : (key -> 'a -> 'b) -> 'a t -> 'b list
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(** Map on a hashtable's items, collect into a list *)
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val to_seq : 'a t -> (key * 'a) sequence
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(** Iterate on values in the table *)
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val of_seq : (key * 'a) sequence -> 'a t
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(** From the given bindings, added in order *)
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val add_seq : 'a t -> (key * 'a) sequence -> unit
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(** Add the corresponding pairs to the table, using {!Hashtbl.add}.
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@since 0.16 *)
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val add_seq_count : int t -> key sequence -> unit
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(** [add_seq_count tbl seq] increments the count of each element of [seq]
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by calling {!incr}. This is useful for counting how many times each
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element of [seq] occurs.
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@since 0.16 *)
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val of_seq_count : key sequence -> int t
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(** Similar to {!add_seq_count}, but allocates a new table and returns it
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@since 0.16 *)
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val to_list : 'a t -> (key * 'a) list
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(** List of bindings (order unspecified) *)
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val of_list : (key * 'a) list -> 'a t
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(** Build a table from the given list of bindings [k_i -> v_i],
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added in order using {!add}. If a key occurs several times,
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it will be added several times, and the visible binding
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will be the last one. *)
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val update : 'a t -> f:(key -> 'a option -> 'a option) -> k:key -> unit
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(** [update tbl ~f ~k] updates key [k] by calling [f k (Some v)] if
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[k] was mapped to [v], or [f k None] otherwise; if the call
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returns [None] then [k] is removed/stays removed, if the call
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returns [Some v'] then the binding [k -> v'] is inserted
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using {!Hashtbl.replace}
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@since 0.14 *)
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val get_or_add : 'a t -> f:(key -> 'a) -> k:key -> 'a
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(** [get_or_add tbl ~k ~f] finds and returns the binding of [k]
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in [tbl], if it exists. If it does not exist, then [f k]
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is called to obtain a new binding [v]; [k -> v] is added
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to [tbl] and [v] is returned.
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@since 1.0 *)
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val pp : key printer -> 'a printer -> 'a t printer
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(** Printer for tables
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@since 0.13
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Renamed from {!print} @since 2.0 *)
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end
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module Make(X : Hashtbl.HashedType) :
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S with type key = X.t and type 'a t = 'a Hashtbl.Make(X).t
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