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//===----------------------------------------------------------------------===//
//
// This source file is part of the Swift Collections open source project
//
// Copyright (c) 2022 - 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
//
//===----------------------------------------------------------------------===//
extension TreeSet {
/// Returns a new persistent set containing all the members of this persistent
/// set that satisfy the given predicate.
///
/// - Parameter isIncluded: A closure that takes a value as its
/// argument and returns a Boolean value indicating whether the value
/// should be included in the returned set.
///
/// - Returns: A set of the values that `isIncluded` allows.
///
/// - Complexity: O(`count`)
@inlinable
public func filter(
_ isIncluded: (Element) throws -> Bool
) rethrows -> Self {
let result = try _root.filter(.top) { try isIncluded($0.key) }
guard let result = result else { return self }
return TreeSet(_new: result.finalize(.top))
}
/// Removes all the elements that satisfy the given predicate.
///
/// Use this method to remove every element in the set that meets
/// particular criteria.
/// This example removes all the odd values from a
/// set of numbers:
///
/// var numbers: TreeSet = [5, 6, 7, 8, 9, 10, 11]
/// numbers.removeAll(where: { $0 % 2 != 0 })
/// // numbers == [6, 8, 10]
///
/// - Parameter shouldBeRemoved: A closure that takes an element of the
/// set as its argument and returns a Boolean value indicating
/// whether the element should be removed from the collection.
///
/// - Complexity: O(`count`)
@inlinable
public mutating func removeAll(
where shouldBeRemoved: (Element) throws -> Bool
) rethrows {
// FIXME: Implement in-place reductions
self = try filter { try !shouldBeRemoved($0) }
}
}
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