Module PMap


module PMap: Extlib.PMap
Polymorphic Map.

This is a polymorphic map, similar to standard library Map module but in a defunctorized style.
Author(s): Xavier Leroy (Base library), Nicolas Cannasse, Markus Mottl, David Rajchenbach-Teller


type ('a, 'b) t 
val empty : ('a, 'b) t
The empty map, using compare as key comparison function.
val is_empty : ('a, 'b) t -> bool
returns true if the map is empty.
val create : ('a -> 'a -> int) -> ('a, 'b) t
creates a new empty map, using the provided function for key comparison.
val add : 'a -> 'b -> ('a, 'b) t -> ('a, 'b) t
add x y m returns a map containing the same bindings as m, plus a binding of x to y. If x was already bound in m, its previous binding disappears.
val find : 'a -> ('a, 'b) t -> 'b
find x m returns the current binding of x in m, or raises Not_found if no such binding exists.
val remove : 'a -> ('a, 'b) t -> ('a, 'b) t
remove x m returns a map containing the same bindings as m, except for x which is unbound in the returned map.
val mem : 'a -> ('a, 'b) t -> bool
mem x m returns true if m contains a binding for x, and false otherwise.
val exists : 'a -> ('a, 'b) t -> bool
same as mem.
val iter : ('a -> 'b -> unit) -> ('a, 'b) t -> unit
iter f m applies f to all bindings in map m. f receives the key as first argument, and the associated value as second argument. The order in which the bindings are passed to f is unspecified. Only current bindings are presented to f: bindings hidden by more recent bindings are not passed to f.
val map : ('a -> 'b) -> ('c, 'a) t -> ('c, 'b) t
map f m returns a map with same domain as m, where the associated value a of all bindings of m has been replaced by the result of the application of f to a. The order in which the associated values are passed to f is unspecified.
val mapi : ('a -> 'b -> 'c) -> ('a, 'b) t -> ('a, 'c) t
Same as map, but the function receives as arguments both the key and the associated value for each binding of the map.
val fold : ('a -> 'b -> 'b) -> ('c, 'a) t -> 'b -> 'b
fold f m a computes (f kN dN ... (f k1 d1 a)...), where k1 ... kN are the keys of all bindings in m, and d1 ... dN are the associated data. The order in which the bindings are presented to f is unspecified.
val foldi : ('a -> 'b -> 'c -> 'c) -> ('a, 'b) t -> 'c -> 'c
Same as fold, but the function receives as arguments both the key and the associated value for each binding of the map.
val filter : ('a -> bool) -> ('b, 'a) t -> ('b, 'a) t
filter f m returns a map where only the values a of m such that f a = true remain. The bindings are passed to f in increasing order with respect to the ordering over the type of the keys.
val filteri : ('a -> 'b -> bool) -> ('a, 'b) t -> ('a, 'b) t
filter f m returns a map where only the (key, value) pairs key, a of m such that f key a = true remain. The bindings are passed to f in increasing order with respect to the ordering over the type of the keys.
val filter_map : ('a -> 'b -> 'c option) -> ('a, 'b) t -> ('a, 'c) t
filter_map f m combines the features of filteri and map. It calls calls f key0 a0, f key1 a1, f keyn an where a0..an are the elements of m and key0..keyn the respective corresponding keys. It returns the map of pairs keyi,bi such as f keyi ai = Some bi (when f returns None, the corresponding element of m is discarded).
val enum : ('a, 'b) t -> ('a * 'b) Enum.t
creates an enumeration for this map.
val of_enum : ?cmp:('a -> 'a -> int) -> ('a * 'b) Enum.t -> ('a, 'b) t
creates a map from an enumeration, using the specified function for key comparison or compare by default.

Boilerplate code


S-Expressions

val t_of_sexp : (Sexplib.Sexp.t -> 'a) ->
(Sexplib.Sexp.t -> 'b) -> Sexplib.Sexp.t -> ('a, 'b) t
val sexp_of_t : ('a -> Sexplib.Sexp.t) ->
('b -> Sexplib.Sexp.t) -> ('a, 'b) t -> Sexplib.Sexp.t

Printing

val print : ?first:string ->
?last:string ->
?sep:string ->
('a Extlib.InnerIO.output -> 'b -> unit) ->
('a Extlib.InnerIO.output -> 'c -> unit) ->
'a Extlib.InnerIO.output -> ('b, 'c) t -> unit