batteries
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package batteries
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Polymorphic Multi-Map.

This is a polymorphic multi-map, i.e. an association from 1 to many.

This implementation uses Pervasives.compare to compare both keys and values.

  • author Xavier Leroy
  • author Nicolas Cannasse
  • author Markus Mottle
  • author David 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 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.

val find : 'a -> ('a, 'b) t -> 'b BatSet.t

find x m returns the current binding of x in m

val remove_all : 'a -> ('a, 'b) t -> ('a, 'b) t

remove_all x m returns a map containing the same bindings as m, except for x which is unbound in the returned map.

val remove : 'a -> 'b -> ('a, 'b) t -> ('a, 'b) t

remove k d m returns a map containing the same bindings as m, except for k which is not bound to d anymore in the returned map. If k was not bound to d, nothing is changed. If the operation removes the last binding of k, then k is also removed from the set of keys.

val mem : 'a -> ('a, 'b) t -> bool

mem x m returns true if m contains at least a binding for x, and false otherwise.

val iter : ('a -> 'b BatSet.t -> 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 : ('b BatSet.t -> 'c BatSet.t) -> ('a, 'b) t -> ('a, 'c) 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map f m returns a map with same domain as m, where the associated value a of all bindings of m has been replaced by the result of the application of f to a. The order in which the associated values are passed to f is unspecified.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 BatSet.t -> 'c BatSet.t) -> ('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 : ('b BatSet.t -> 'c -> 'c) -> ('a, 'b) t -> 'c -> 'c

fold f m a computes (f kN dN ... (f k1 d1 (f k0 d0 a))...), where k0,k1..kN are the keys of all bindings in m, and d0,d1..dN are the associated data. The order in which the bindings are presented to f is unspecified.

val foldi : ('a -> 'b BatSet.t -> '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 modify : 'a -> ('b BatSet.t -> 'b BatSet.t) -> ('a, 'b) t -> ('a, 'b) t

modify x f m replaces the binding for x with f applied to these values.

  • since 2.1
  • raises Not_found

    is x is unbound in m

val modify_def : 'b BatSet.t -> 'a -> ('b BatSet.t -> 'b BatSet.t) -> ('a, 'b) t -> ('a, 'b) t

modify_def dfl x f m performs as modify x f m but it adds f dfl in m instead of raising Not_found if x was unbound.

  • since 2.1
val modify_opt : 'a -> ('b BatSet.t option -> 'b BatSet.t option) -> ('a, 'b) t -> ('a, 'b) t

modify_opt x f m allows to modify the bindings for k in m or absence thereof.

  • since 2.1
val enum : ('a, 'b) t -> ('a * 'b) BatEnum.t

creates an enumeration for this map.

val of_enum : ('a * 'b) BatEnum.t -> ('a, 'b) t

creates a map from an enumeration, using the specified function for key comparison or compare by default.

module Infix : sig ... end

Infix operators over a BatMultiPMap

Boilerplate code
Printing
val print : ?first:string -> ?last:string -> ?sep:string -> ?kvsep:string -> ('a BatInnerIO.output -> 'b -> unit) -> ('a BatInnerIO.output -> 'c -> unit) -> 'a BatInnerIO.output -> ('b, 'c) t -> unit