Module
ordsets
Module Summary
Functions for manipulating sets as ordered lists.
Description
Sets are collections of elements with no duplicate elements. An ordset is a representation of a set, where an ordered list is used to store the elements of the set. An ordered list is more efficient than an unordered list. Elements are ordered according to the Erlang term order.
This module provides the same interface as the sets(3) module but with a defined representation. One difference is that while sets considers two elements as different if they do not match (=:=), this module considers two elements as different if and only if they do not compare equal (==).
Data Types
ordset(T) = [T]As returned by new/0.
Exports
add_element(Element, Ordset1) -> Ordset2 |
Types
Returns a new ordered set formed from Ordset1 with Element inserted.
del_element(Element, Ordset1) -> Ordset2 |
Types
Returns Ordset1, but with Element removed.
filter(Pred, Ordset1) -> Ordset2 |
Types
Filters elements in Ordset1 with boolean function Pred.
fold(Function, Acc0, Ordset) -> Acc1 |
Types
Folds Function over every element in Ordset and returns the final value of the accumulator.
from_list(List) -> Ordset |
Types
Returns an ordered set of the elements in List.
intersection(OrdsetList) -> Ordset |
Types
Returns the intersection of the non-empty list of sets.
intersection(Ordset1, Ordset2) -> Ordset3 |
Types
Returns the intersection of Ordset1 and Ordset2.
is_disjoint(Ordset1, Ordset2) -> boolean() |
Types
Returns true if Ordset1 and Ordset2 are disjoint (have no elements in common), otherwise false.
is_element(Element, Ordset) -> boolean() |
Types
Returns true if Element is an element of Ordset, otherwise false.
is_empty(Ordset) -> boolean() | OTP 21.0 |
Types
Returns true if Ordset is an empty set, otherwise false.
is_set(Ordset) -> boolean() |
Types
Returns true if Ordset is an ordered set of elements, otherwise false.
is_subset(Ordset1, Ordset2) -> boolean() |
Types
Returns true when every element of Ordset1 is also a member of Ordset2, otherwise false.
new() -> [] |
Returns a new empty ordered set.
size(Ordset) -> integer() >= 0 |
Types
Returns the number of elements in Ordset.
subtract(Ordset1, Ordset2) -> Ordset3 |
Types
Returns only the elements of Ordset1 that are not also elements of Ordset2.
to_list(Ordset) -> List |
Types
Returns the elements of Ordset as a list.
union(OrdsetList) -> Ordset |
Types
Returns the merged (union) set of the list of sets.
union(Ordset1, Ordset2) -> Ordset3 |
Types
Returns the merged (union) set of Ordset1 and Ordset2.
See Also
© 2010–2020 Ericsson AB
Licensed under the Apache License, Version 2.0.