1sets(3)                    Erlang Module Definition                    sets(3)
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3
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NAME

6       sets - Functions for set manipulation.
7

DESCRIPTION

9       Sets are collections of elements with no duplicate elements. The repre‐
10       sentation of a set is undefined.
11
12       This module provides the same interface as the  ordsets(3)  module  but
13       with  an  undefined  representation.  One difference is that while this
14       module considers two elements as different if they do not match  (=:=),
15       ordsets  considers two elements as different if and only if they do not
16       compare equal (==).
17

DATA TYPES

19       set(Element)
20
21              As returned by new/0.
22
23       set() = set(term())
24

EXPORTS

26       add_element(Element, Set1) -> Set2
27
28              Types:
29
30                 Set1 = Set2 = set(Element)
31
32              Returns a new set formed from Set1 with Element inserted.
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34       del_element(Element, Set1) -> Set2
35
36              Types:
37
38                 Set1 = Set2 = set(Element)
39
40              Returns Set1, but with Element removed.
41
42       filter(Pred, Set1) -> Set2
43
44              Types:
45
46                 Pred = fun((Element) -> boolean())
47                 Set1 = Set2 = set(Element)
48
49              Filters elements in Set1 with boolean function Pred.
50
51       fold(Function, Acc0, Set) -> Acc1
52
53              Types:
54
55                 Function = fun((Element, AccIn) -> AccOut)
56                 Set = set(Element)
57                 Acc0 = Acc1 = AccIn = AccOut = Acc
58
59              Folds Function over every element in Set and returns  the  final
60              value of the accumulator. The evaluation order is undefined.
61
62       from_list(List) -> Set
63
64              Types:
65
66                 List = [Element]
67                 Set = set(Element)
68
69              Returns a set of the elements in List.
70
71       intersection(SetList) -> Set
72
73              Types:
74
75                 SetList = [set(Element), ...]
76                 Set = set(Element)
77
78              Returns the intersection of the non-empty list of sets.
79
80       intersection(Set1, Set2) -> Set3
81
82              Types:
83
84                 Set1 = Set2 = Set3 = set(Element)
85
86              Returns the intersection of Set1 and Set2.
87
88       is_disjoint(Set1, Set2) -> boolean()
89
90              Types:
91
92                 Set1 = Set2 = set(Element)
93
94              Returns  true if Set1 and Set2 are disjoint (have no elements in
95              common), otherwise false.
96
97       is_element(Element, Set) -> boolean()
98
99              Types:
100
101                 Set = set(Element)
102
103              Returns true if Element is an element of Set, otherwise false.
104
105       is_set(Set) -> boolean()
106
107              Types:
108
109                 Set = term()
110
111              Returns true if Set is a set of elements, otherwise false.
112
113       is_subset(Set1, Set2) -> boolean()
114
115              Types:
116
117                 Set1 = Set2 = set(Element)
118
119              Returns true when every element of Set1  is  also  a  member  of
120              Set2, otherwise false.
121
122       new() -> set()
123
124              Returns a new empty set.
125
126       size(Set) -> integer() >= 0
127
128              Types:
129
130                 Set = set()
131
132              Returns the number of elements in Set.
133
134       subtract(Set1, Set2) -> Set3
135
136              Types:
137
138                 Set1 = Set2 = Set3 = set(Element)
139
140              Returns  only the elements of Set1 that are not also elements of
141              Set2.
142
143       to_list(Set) -> List
144
145              Types:
146
147                 Set = set(Element)
148                 List = [Element]
149
150              Returns the elements of Set as a list. The order of the returned
151              elements is undefined.
152
153       union(SetList) -> Set
154
155              Types:
156
157                 SetList = [set(Element)]
158                 Set = set(Element)
159
160              Returns the merged (union) set of the list of sets.
161
162       union(Set1, Set2) -> Set3
163
164              Types:
165
166                 Set1 = Set2 = Set3 = set(Element)
167
168              Returns the merged (union) set of Set1 and Set2.
169

SEE ALSO

171       gb_sets(3), ordsets(3)
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174
175Ericsson AB                     stdlib 3.4.5.1                         sets(3)