NAME¶

Map.S - Output signature of the functor Map.Make.

Module type¶

Module type Map.S

Documentation¶

Module type S
= sig end

Output signature of the functor Map.Make .

type key

The type of the map keys.

type +'a t

The type of maps from type key to type 'a .

val empty : 'a t

The empty map.

val is_empty : 'a t -> bool

Test whether a map is empty or not.

val add : key -> 'a -> 'a t -> 'a 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 : key -> 'a t -> 'a

find x m returns the current binding of x in m , or raises Not_found if no such binding exists.

val remove : key -> 'a t -> 'a 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 : key -> 'a t -> bool

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

val iter : (key -> 'a -> unit) -> 'a 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 bindings are passed to f in increasing order with respect to the ordering over the type of the keys.

val map : ('a -> 'b) -> 'a t -> '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map f m returns a map with same domain as m , where the associated value a of all bindings of m has been replaced by the result of the application of f to a .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 bindings are passed to f in increasing order with respect to the ordering over the type of the keys.

val mapi : (key -> 'a -> 'b) -> 'a t -> 'b t

Same as Map.S.map , but the function receives as arguments both the key and the associated value for each binding of the map.

val fold : (key -> 'a -> 'b -> 'b) -> '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 (in increasing order), and d1 ... dN are the associated data.

val compare : ('a -> 'a -> int) -> 'a t -> 'a t -> int

Total ordering between maps. The first argument is a total ordering used to compare data associated with equal keys in the two maps.

val equal : ('a -> 'a -> bool) -> 'a t -> 'a t -> bool

equal cmp m1 m2 tests whether the maps m1 and m2 are equal, that is, contain equal keys and associate them with equal data. cmp is the equality predicate used to compare the data associated with the keys.