# source:Deliverables/D2.2/8051/src/utilities/myMap.mli

Last change on this file was 486, checked in by ayache, 9 years ago

Deliverable D2.2

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[486]1(***********************************************************************)
2(*                                                                     *)
3(*                           Objective Caml                            *)
4(*                                                                     *)
5(*            Xavier Leroy, projet Cristal, INRIA Rocquencourt         *)
6(*                                                                     *)
7(*  Copyright 1996 Institut National de Recherche en Informatique et   *)
9(*  under the terms of the GNU Library General Public License, with    *)
11(*                                                                     *)
12(***********************************************************************)
13
14(* \$Id: myMap.mli,v 1.3 2006/02/17 16:19:52 pottier Exp \$ *)
15
16(** Association tables over ordered types.
17
18   This module implements applicative association tables, also known as
19   finite maps or dictionaries, given a total ordering function
20   over the keys.
21   All operations over maps are purely applicative (no side-effects).
22   The implementation uses balanced binary trees, and therefore searching
23   and insertion take time logarithmic in the size of the map.
24*)
25
26module type OrderedType =
27  sig
28    type t
29      (** The type of the map keys. *)
30    val compare : t -> t -> int
31      (** A total ordering function over the keys.
32          This is a two-argument function [f] such that
33          [f e1 e2] is zero if the keys [e1] and [e2] are equal,
34          [f e1 e2] is strictly negative if [e1] is smaller than [e2],
35          and [f e1 e2] is strictly positive if [e1] is greater than [e2].
36          Example: a suitable ordering function is the generic structural
37          comparison function {!Pervasives.compare}. *)
38  end
39(** Input signature of the functor {!Map.Make}. *)
40
41module type S =
42  sig
43    type key
44    (** The type of the map keys. *)
45
46    type (+'a) t
47    (** The type of maps from type [key] to type ['a]. *)
48
49    val empty: 'a t
50    (** The empty map. *)
51
52    val is_empty: 'a t -> bool
53    (** Test whether a map is empty or not. *)
54
55    val add: key -> 'a -> 'a t -> 'a t
56    (** [add x y m] returns a map containing the same bindings as
57       [m], plus a binding of [x] to [y]. If [x] was already bound
58       in [m], its previous binding disappears. *)
59
60    val find: key -> 'a t -> 'a
61    (** [find x m] returns the current binding of [x] in [m],
62       or raises [Not_found] if no such binding exists. *)
63
64    val remove: key -> 'a t -> 'a t
65    (** [remove x m] returns a map containing the same bindings as
66       [m], except for [x] which is unbound in the returned map. *)
67
68    val mem: key -> 'a t -> bool
69    (** [mem x m] returns [true] if [m] contains a binding for [x],
70       and [false] otherwise. *)
71
72    val iter: (key -> 'a -> unit) -> 'a t -> unit
73    (** [iter f m] applies [f] to all bindings in map [m].
74       [f] receives the key as first argument, and the associated value
75       as second argument.  The bindings are passed to [f] in increasing
76       order with respect to the ordering over the type of the keys.
77       Only current bindings are presented to [f]:
78       bindings hidden by more recent bindings are not passed to [f]. *)
79
80    val map: ('a -> 'b) -> 'a t -> 'b t
81    (** [map f m] returns a map with same domain as [m], where the
82       associated value [a] of all bindings of [m] has been
83       replaced by the result of the application of [f] to [a].
84       The bindings are passed to [f] in increasing order
85       with respect to the ordering over the type of the keys. *)
86
87    val mapi: (key -> 'a -> 'b) -> 'a t -> 'b t
88    (** Same as {!Map.S.map}, but the function receives as arguments both the
89       key and the associated value for each binding of the map. *)
90
91    val fold: (key -> 'a -> 'b -> 'b) -> 'a t -> 'b -> 'b
92    (** [fold f m a] computes [(f kN dN ... (f k1 d1 a)...)],
93       where [k1 ... kN] are the keys of all bindings in [m]
94       (in increasing order), and [d1 ... dN] are the associated data. *)
95
96    val compare: ('a -> 'a -> int) -> 'a t -> 'a t -> int
97    (** Total ordering between maps.  The first argument is a total ordering
98        used to compare data associated with equal keys in the two maps. *)
99
100    val equal: ('a -> 'a -> bool) -> 'a t -> 'a t -> bool
101    (** [equal cmp m1 m2] tests whether the maps [m1] and [m2] are
102       equal, that is, contain equal keys and associate them with
103       equal data.  [cmp] is the equality predicate used to compare
104       the data associated with the keys. *)
105
106    type interval =
107        key option * key option
108    (** A type of key intervals. An interval consists of a lower bound
109       and an upper bound, each of which can be absent. A key is
110       considered to lie within the interval if it is both greater than
111       (or equal to) the lower bound (if present) and less than (or
112       equal to) the upper bound (if present). *)
113
114    val split: interval -> 'a t -> 'a t
115    (* [split interval m] is a map that consists of all bindings in [m]
116       whose keys lie within [interval]. *)
117
118    val minimum: 'a t -> key * 'a
119    (* [minimum m] returns the binding that corresponds to the minimum
120       (smallest) key within the map [m]. If [m] is empty, [Not_found]
121       is raised. *)
122
123    val find_remove: key -> 'a t -> 'a * 'a t
124    (** [find_remove x m] returns a pair of the current binding of [x]
125        in [m], and a map containing the same bindings as [m], except
126        for [x] which is unbound in the returned map. [Not_found] is
127        raised if no binding for [x] exists. *)
128
129    val update: key -> ('a -> 'a) -> 'a t -> 'a t
130    (** If [m] maps [x] to [d], then [update x f m] maps [x] to [f d]
131        and coincides with [m] elsewhere. A binding for [x] in [m]
132        must exist. *)
133
134    val restrict: (key -> bool) -> 'a t -> 'a t
135    (** [restrict p m] is the restriction of the map [m] to only
136        the keys that satisfy predicate [p]. *)
137
138  end
139(** Output signature of the functor {!Map.Make}. *)
140
141module Make (Ord : OrderedType) : S with type key = Ord.t
142(** Functor building an implementation of the map structure
143   given a totally ordered type. *)
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