CCHashtbl.Poly
val get : ('a, 'b) Hashtbl.t -> 'a -> 'b option
get tbl k
finds a binding for the key k
if present, or returns None
if no value is found. 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
).
keys tbl f
iterates on keys (similar order as Hashtbl
.iter).
val keys_list : ('a, 'b) Hashtbl.t -> 'a list
keys_list tbl
is the list of keys in tbl
. If the key is in the Hashtable multiple times, all occurrences will be returned.
val values_list : ('a, 'b) Hashtbl.t -> 'b list
values_list tbl
is the list of values in tbl
.
val map_list : ('a -> 'b -> 'c) -> ('a, 'b) Hashtbl.t -> 'c list
map_list f tbl
maps on a tbl
'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)
.
val decr : ?by:int -> ('a, int) Hashtbl.t -> 'a -> unit
decr ?by tbl x
is 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.
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
.
Add the corresponding pairs to the table, using Hashtbl
.add.
Add the corresponding pairs to the table, using Hashtbl
.add. If a key occurs multiple times in the input, the values are combined using f
in an unspecified order.
Add the corresponding pairs to the table, using Hashtbl
.add. Renamed from add_std_seq
since 3.0.
Add the corresponding pairs to the table. If a key occurs multiple times in the input, the values are combined using f
in an unspecified order.
From the given bindings, added in order. If a key occurs multiple times in the input, the values are combined using f
in an unspecified order.
From the given bindings, added in order. Renamed from of_std_seq
since 3.0.
From the given bindings, added in order. If a key occurs multiple times in the input, the values are combined using f
in an unspecified order.
add_iter_count tbl i
increments the count of each element of i
by calling incr
. This is useful for counting how many times each element of i
occurs.
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. Renamed from add_std_seq_count
since 3.0.
Like add_seq_count
, but allocates a new table and returns it.
Like add_seq_count
, but allocates a new table and returns it. Renamed from of_std_seq_count
since 3.0.
val to_list : ('a, 'b) Hashtbl.t -> ('a * 'b) list
to_list tbl
returns the list of (key,value) bindings (order unspecified).
val of_list : ('a * 'b) list -> ('a, 'b) Hashtbl.t
of_list l
builds a table from the given list l
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 of_list_with : f:('a -> 'b -> 'b -> 'b) -> ('a * 'b) list -> ('a, 'b) Hashtbl.t
From the given bindings, added in order. If a key occurs multiple times in the input, the values are combined using f
in an unspecified order.
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.
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.
val pp : ?pp_start:unit printer -> ?pp_stop:unit printer -> ?pp_sep:unit printer -> ?pp_arrow:unit printer ->
'a printer -> 'b printer -> ('a, 'b) Hashtbl.t printer
pp ~pp_start ~pp_stop ~pp_sep ~pp arrow pp_k pp_v
returns a table printer given a pp_k
printer for individual key and a pp_v
printer for individual value. pp_start
and pp_stop
control the opening and closing delimiters, by default print nothing. pp_sep
control the separator between binding. pp_arrow
control the arrow between the key and value. Renamed from print
since 2.0.