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//===----------------------------------------------------------------------===//
//
// This source file is part of the Swift Collections open source project
//
// Copyright (c) 2021 - 2024 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See https://swift.org/LICENSE.txt for license information
//
//===----------------------------------------------------------------------===//
#if !COLLECTIONS_SINGLE_MODULE
import InternalCollectionsUtilities
#endif
// `OrderedSet` does not directly conform to `SetAlgebra` because its definition
// of equality conflicts with `SetAlgebra` requirements. However, it still
// implements most `SetAlgebra` requirements (except `insert`, which is replaced
// by `append`).
//
// `OrderedSet` also provides an `unordered` view that explicitly conforms to
// `SetAlgebra`. That view implements `Equatable` by ignoring element order,
// so it can satisfy `SetAlgebra` requirements.
extension OrderedSet {
/// Returns a Boolean value that indicates whether the set is a strict
/// superset of the given set.
///
/// Set *A* is a strict superset of another set *B* if every member of *B* is
/// also a member of *A* and *A* contains at least one element that is *not*
/// a member of *B*. (Ignoring the order the elements appear in the sets.)
///
/// let a: OrderedSet = [1, 2, 3, 4]
/// let b: OrderedSet = [4, 2, 1]
/// a.isStrictSuperset(of: b) // true
///
/// - Parameter other: Another set.
///
/// - Returns: `true` if `self` is a strict superset of `other`; otherwise,
/// `false`.
///
/// - Complexity: Expected to be O(`other.count`) on average, if `Element`
/// implements high-quality hashing.
@inlinable
public func isStrictSuperset(of other: Self) -> Bool {
self.count > other.count && other.isSubset(of: self)
}
// Generalizations
/// Returns a Boolean value that indicates whether the set is a strict
/// superset of the given set.
///
/// Set *A* is a strict superset of another set *B* if every member of *B* is
/// also a member of *A* and *A* contains at least one element that is *not*
/// a member of *B*. (Ignoring the order the elements appear in the sets.)
///
/// let a: OrderedSet = [1, 2, 3, 4]
/// let b: OrderedSet = [4, 2, 1]
/// a.isStrictSuperset(of: b.unordered) // true
///
/// - Parameter other: Another set.
///
/// - Returns: `true` if `self` is a strict superset of `other`; otherwise,
/// `false`.
///
/// - Complexity: Expected to be O(`other.count`) on average, if `Element`
/// implements high-quality hashing.
@inlinable
@inline(__always)
public func isStrictSuperset(of other: UnorderedView) -> Bool {
isStrictSuperset(of: other._base)
}
/// Returns a Boolean value that indicates whether the set is a strict
/// superset of the given set.
///
/// Set *A* is a strict superset of another set *B* if every member of *B* is
/// also a member of *A* and *A* contains at least one element that is *not*
/// a member of *B*. (Ignoring the order the elements appear in the sets.)
///
/// let a: OrderedSet = [1, 2, 3, 4]
/// let b: Set = [4, 2, 1]
/// a.isStrictSuperset(of: b) // true
///
/// - Parameter other: Another set.
///
/// - Returns: `true` if `self` is a strict superset of `other`; otherwise,
/// `false`.
///
/// - Complexity: Expected to be O(`other.count`) on average, if `Element`
/// implements high-quality hashing.
@inlinable
public func isStrictSuperset(of other: Set<Element>) -> Bool {
self.count > other.count && other.isSubset(of: self)
}
/// Returns a Boolean value that indicates whether the set is a strict
/// superset of the given sequence.
///
/// Set *A* is a strict superset of another set *B* if every member of *B* is
/// also a member of *A* and *A* contains at least one element that is *not*
/// a member of *B*. (Ignoring the order the elements appear in the sets.)
///
/// let a: OrderedSet = [1, 2, 3, 4]
/// let b: Array = [4, 2, 1]
/// a.isStrictSuperset(of: b) // true
///
/// - Parameter other: A finite sequence of elements, some of whose members
/// may appear more than once. (Duplicate items are ignored.)
///
/// - Returns: `true` if `self` is a strict superset of `other`; otherwise,
/// `false`.
///
/// - Complexity: Expected to be O(`self.count` + *n*) on average, where *n*
/// is the number of elements in `other`, if `Element` implements
/// high-quality hashing.
@inlinable
public func isStrictSuperset(
of other: some Sequence<Element>
) -> Bool {
if let other = _specialize(other, for: Self.self) {
return self.isStrictSuperset(of: other)
}
if let other = _specialize(other, for: Set<Element>.self) {
return self.isStrictSuperset(of: other)
}
var it = self.makeIterator()
guard let first = it.next() else { return false }
if let match = other._customContainsEquatableElement(first) {
// Fast path: the sequence has fast containment checks.
guard other.allSatisfy({ self.contains($0) }) else { return false }
guard match else { return true }
while let item = it.next() {
guard other.contains(item) else { return true }
}
return false
}
return _UnsafeBitSet.withTemporaryBitSet(capacity: count) { seen in
// Mark elements in `self` that we've seen in `other`.
var c = 0
for item in other {
guard let index = _find(item).index else {
return false
}
if seen.insert(index) {
c &+= 1
if c == self.count {
// We've seen enough.
return false
}
}
}
return c < self.count
}
}
}
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