Github user fumoboy007 commented on a diff in the pull request: https://github.com/apache/thrift/pull/1084#discussion_r78312532 --- Diff: lib/swift/Sources/TSet.swift --- @@ -0,0 +1,175 @@ +/* + * Licensed to the Apache Software Foundation (ASF) under one + * or more contributor license agreements. See the NOTICE file + * distributed with this work for additional information + * regarding copyright ownership. The ASF licenses this file + * to you under the Apache License, Version 2.0 (the + * "License"); you may not use this file except in compliance + * with the License. You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, + * software distributed under the License is distributed on an + * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY + * KIND, either express or implied. See the License for the + * specific language governing permissions and limitations + * under the License. + */ + +import Foundation + +public struct TSet<Element : TSerializable & Hashable> : SetAlgebra, Hashable, Collection, ExpressibleByArrayLiteral, TSerializable { + /// Typealias for Storage type + typealias Storage = Set<Element> + + + /// Internal Storage used for TSet (Set\<Element\>) + internal var storage : Storage + + + /// Mark: Collection + + public typealias Indices = Storage.Indices + public typealias Index = Storage.Index + public typealias IndexDistance = Storage.IndexDistance + public typealias SubSequence = Storage.SubSequence + + + public var indices: Indices { return storage.indices } + + // Must implement isEmpty even though both SetAlgebra and Collection provide it due to their conflciting default implementations + public var isEmpty: Bool { return storage.isEmpty } + + public func distance(from start: Index, to end: Index) -> IndexDistance { + return storage.distance(from: start, to: end) + } + + public func index(_ i: Index, offsetBy n: IndexDistance) -> Index { + return storage.index(i, offsetBy: n) + } + + public func index(_ i: Index, offsetBy n: IndexDistance, limitedBy limit: Index) -> Index? { + return storage.index(i, offsetBy: n, limitedBy: limit) + } + + public subscript (position: Storage.Index) -> Element? { + return storage[position] + } + + /// Mark: SetAlgebra + internal init(storage: Set<Element>) { + self.storage = storage + } + + public func contains(_ member: Element) -> Bool { + return storage.contains(member) + } + + public mutating func insert(_ newMember: Element) -> (inserted: Bool, memberAfterInsert: Element) { + return storage.insert(newMember) + } + + public mutating func remove(_ member: Element) -> Element? { + return storage.remove(member) + } + + public func union(_ other: TSet<Element>) -> TSet { + return TSet(storage: storage.union(other.storage)) + } + + public mutating func formIntersection(_ other: TSet<Element>) { + return storage.formIntersection(other.storage) + } + + public mutating func formSymmetricDifference(_ other: TSet<Element>) { + return storage.formSymmetricDifference(other.storage) + } + + public mutating func formUnion(_ other: TSet<Element>) { + return storage.formUnion(other.storage) + } + + public func intersection(_ other: TSet<Element>) -> TSet { + return TSet(storage: storage.intersection(other.storage)) + } + + public func symmetricDifference(_ other: TSet<Element>) -> TSet { + return TSet(storage: storage.symmetricDifference(other.storage)) + } + + public mutating func update(with newMember: Element) -> Element? { + return storage.update(with: newMember) + } + + /// Mark: IndexableBase + + public var startIndex: Index { return storage.startIndex } + public var endIndex: Index { return storage.endIndex } + public func index(after i: Index) -> Index { + return storage.index(after: i) + } + + public func formIndex(after i: inout Storage.Index) { + storage.formIndex(after: &i) + } + + public subscript(bounds: Range<Index>) -> SubSequence { + return storage[bounds] + } + + + /// Mark: Hashable + public var hashValue : Int { + let prime = 31 + var result = 1 + for element in storage { + result = prime * result + element.hashValue --- End diff -- `&*`, `&+`?
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