Swift 4.2 はどのような進化をしているのか/whats-new-swift42

Favorite Kubernetes Rust Yusuke Hosonuma DeNA SWET - Software Engineer
in Test - Copyright (C) DeNA Co.,Ltd. All Rights Reserved. 3 Copyright (C) DeNA Co.,Ltd. All Rights Reserved. @tobi462

Swift 4.2 ͷมߋ఺ 7 Copyright (C) DeNA Co.,Ltd. All Rights
Reserved. Copyright (C) DeNA Co.,Ltd. All Rights Reserved.

Swift 4.2 ͷมߋ఺ 8 Copyright (C) DeNA Co.,Ltd. All Rights
Reserved. Copyright (C) DeNA Co.,Ltd. All Rights Reserved. ͦΕ͚ͩ͡Ό෺଍Γͳ͍ʁ

22 Copyright (C) DeNA Co.,Ltd. All Rights Reserved. Copyright (C)
DeNA Co.,Ltd. All Rights Reserved. Swift 1.0 Swift 1.1 Swift 1.2 Swift 2.0 Swift 3.0 Swift 4.0 Swift 4.1 2014 - 09 10 2015 - 04 09 2016 - 09 2017 - 09 2018 - 03

*GMFUͷෳ਺αϙʔτ TUBUJDએݴɹɹBT ɹɹBT Ϗϧυͷߴ଎Խ Copyright (C) DeNA Co.,Ltd. All Rights
Reserved. 28 Copyright (C) DeNA Co.,Ltd. All Rights Reserved. Swift 1.2 େ෯ͳػೳ௥Ճ ࠩ෼Ϗϧυʂ

Swift … ഁյతͳ࢓༷มߋͷ࿈ଓ όʔδϣϯҧ͍ͷωοτهࣄ Ԇظ͠ଓ͚Δ"#*҆ఆԽ Copyright (C) DeNA Co.,Ltd. All
Rights Reserved. 40 Copyright (C) DeNA Co.,Ltd. All Rights Reserved. ͳΜ͔ͩπϥΠ…

What’s Swift 4.2 ? 43 Copyright (C) DeNA Co.,Ltd. All
Rights Reserved. Copyright (C) DeNA Co.,Ltd. All Rights Reserved.

Swift 4.2 ͷ֓ཁ 45 Copyright (C) DeNA Co.,Ltd. All Rights

DeNA Co.,Ltd. All Rights Reserved. SE-0197 SE-0199 SE-0202 SE-0204 SE-0205 SE-0207 SE-0210 Adding in-place removeAll(where:) to the Standard Library Adding toggle to Bool Random Unification Add last(where:) and lastIndex(where:) Methods withUnsafePointer(to:_:) and withUnsafeBytes(of:_:) for immutable values Add an allSatisfy algorithm to Sequence Add an offset(of:) method to MemoryLayout API ͷ௥Ճ / มߋ ̓ͭ

DeNA Co.,Ltd. All Rights Reserved. import Foundation Int(arc4random_uniform(UInt32(10))) // 0 ʙ 9 arc4random_uniform(UInt32(2)) == 0 ? true : false // true | false ൣғʢ3BOHFʣ͔Βੜ੒ Random Unification SE-0202 Swift 4.1

DeNA Co.,Ltd. All Rights Reserved. import Foundation Int(arc4random_uniform(UInt32(10))) // 0 ʙ 9 arc4random_uniform(UInt32(2)) == 0 ? true : false // true | false ൣғʢ3BOHFʣ͔Βੜ੒ Random Unification SE-0202 Swift 4.1 'PVOEBUJPO͕ඞཁ

DeNA Co.,Ltd. All Rights Reserved. import Foundation Int(arc4random_uniform(UInt32(10))) // 0 ʙ 9 arc4random_uniform(UInt32(2)) == 0 ? true : false // true | false ൣғʢ3BOHFʣ͔Βੜ੒ Random Unification SE-0202 Swift 4.1 4XJGUZͰͳ͍"1*

DeNA Co.,Ltd. All Rights Reserved. import Foundation Int(arc4random_uniform(UInt32(10))) // 0 ʙ 9 arc4random_uniform(UInt32(2)) == 0 ? true : false // true | false Int.random(in: 0..<10) // 0 ʙ 9 Bool.random() // true | false ൣғʢ3BOHFʣ͔Βੜ੒ Random Unification SE-0202 Swift 4.1 Swift 4.2

DeNA Co.,Ltd. All Rights Reserved. import Foundation Int(arc4random_uniform(UInt32(10))) // 0 ʙ 9 arc4random_uniform(UInt32(2)) == 0 ? true : false // true | false Int.random(in: 0..<10) // 0 ʙ 9 Bool.random() // true | false ൣғʢ3BOHFʣ͔Βੜ੒ Random Unification SE-0202 Swift 4.1 'PVOEBUJPOͷJNQPSU΋ෆཁʹ Swift 4.2

DeNA Co.,Ltd. All Rights Reserved. let xs = [1, 2, 3, 4, 5] xs.shuffled() // [4, 5, 1, 2, 3] var ys = xs ys.shuffle() print(ys) // [3, 5, 4, 2, 1] ഑ྻΛγϟοϑϧ Random Unification SE-0202 ৽͍͠഑ྻΛฦ͢TIV⒐FE Swift 4.2

DeNA Co.,Ltd. All Rights Reserved. let xs = [1, 2, 3, 4, 5] xs.shuffled() // [4, 5, 1, 2, 3] var ys = xs ys.shuffle() print(ys) // [3, 5, 4, 2, 1] ഑ྻΛγϟοϑϧ Random Unification SE-0202 มߋ͢ΔTIV⒐F Swift 4.2

DeNA Co.,Ltd. All Rights Reserved. let xs = [1, 2, 3, 2, 4] (xs.reversed().firstIndex(of: 2)?.base).map { xs.index(before: $0) } // Optional(3) ྫɿ࠷ޙͷʮʯͷ*OEFYΛऔಘ Add last(where:) and lastIndex(where:) Methods SE-0204 Swift 4.1

DeNA Co.,Ltd. All Rights Reserved. let xs = [1, 2, 3, 2, 4] (xs.reversed().firstIndex(of: 2)?.base).map { xs.index(before: $0) } // Optional(3) ൓సͯ͠ʢSFWFSTFEʣ ࠷ॳͷ*OEFYͷCBTFΛऔಘͯ͠ JOEFY CFGPSF Ͱຊདྷͷ*OEFYʹ ྫɿ࠷ޙͷʮʯͷ*OEFYΛऔಘ Add last(where:) and lastIndex(where:) Methods SE-0204 Swift 4.1 ͱʹ͔͘໘౗…

DeNA Co.,Ltd. All Rights Reserved. let xs = [1, 2, 3, 2, 4] (xs.reversed().firstIndex(of: 2)?.base).map { xs.index(before: $0) } // Optional(3) xs.lastIndex(of: 2) // Optional(3) Swift 4.1 Swift 4.2 ྫɿ࠷ޙͷʮʯͷ*OEFYΛऔಘ Add last(where:) and lastIndex(where:) Methods SE-0204

DeNA Co.,Ltd. All Rights Reserved. let xs = [1, 2, 3, 2, 4] (xs.reversed().firstIndex(of: 2)?.base).map { xs.index(before: $0) } // Optional(3) xs.lastIndex(of: 2) // Optional(3) Swift 4.1 ؆ܿɾ໌ྎʂ Swift 4.2 ྫɿ࠷ޙͷʮʯͷ*OEFYΛऔಘ Add last(where:) and lastIndex(where:) Methods SE-0204

let xs = [2, 4, 6, 8] !xs.contains { $0
% 2 != 0 } // true 84 Copyright (C) DeNA Co.,Ltd. All Rights Reserved. Copyright (C) DeNA Co.,Ltd. All Rights Reserved. ྫɿ഑ྻ಺ͷ͢΂ͯͷཁૉ͕ۮ਺͔ʁ Add an allSatisfy algorithm to Sequence SE-0207 Swift 4.1 ؚ·Ε͍ͯͳ͍͜ͱ

DeNA Co.,Ltd. All Rights Reserved. let xs = [2, 4, 6, 8] !xs.contains { $0 % 2 != 0 } // true xs.allSatisfy { $0 % 2 == 0 } // true ྫɿ഑ྻ಺ͷ͢΂ͯͷཁૉ͕ۮ਺͔ʁ Add an allSatisfy algorithm to Sequence SE-0207 Swift 4.1 Swift 4.2

DeNA Co.,Ltd. All Rights Reserved. let xs = [2, 4, 6, 8] !xs.contains { $0 % 2 != 0 } // true xs.allSatisfy { $0 % 2 == 0 } // true ྫɿ഑ྻ಺ͷ͢΂ͯͷཁૉ͕ۮ਺͔ʁ Add an allSatisfy algorithm to Sequence SE-0207 Swift 4.1 ؆ܿɾ໌ྎʂ Swift 4.2

DeNA Co.,Ltd. All Rights Reserved. xs.removeAll { $0 % 2 == 0 } // [1, 3] var xs = [1, 2, 3, 4] xs = xs.filter { $0 % 2 != 0 } // [1, 3] ྫɿ഑ྻ͔Βۮ਺Λ͢΂ͯऔΓআ͘ Adding in-place removeAll(where:) to the Standard Library SE-0197 Swift 4.1 Swift 4.2

DeNA Co.,Ltd. All Rights Reserved. xs.removeAll { $0 % 2 == 0 } // [1, 3] var xs = [1, 2, 3, 4] xs = xs.filter { $0 % 2 != 0 } // [1, 3] ྫɿ഑ྻ͔Βۮ਺Λ͢΂ͯऔΓআ͘ Adding in-place removeAll(where:) to the Standard Library SE-0197 Swift 4.1 ؆ܿɾ໌ྎʂ Swift 4.2

DeNA Co.,Ltd. All Rights Reserved. let x = 42 var copy = x withUnsafePointer(to: &copy) { pointer in print(pointer.pointee) // 42 } XJUI6OTBGF1PJOUFS withUnsafePointer(to:_:) and withUnsafeBytes(of:_:) for immutable values SE-0205 Swift 4.1

DeNA Co.,Ltd. All Rights Reserved. let x = 42 var copy = x withUnsafePointer(to: &copy) { pointer in print(pointer.pointee) // 42 } XJUI6OTBGF1PJOUFS withUnsafePointer(to:_:) and withUnsafeBytes(of:_:) for immutable values SE-0205 Swift 4.1 WBSʹ୅ೖ͠௚ͯ͠

DeNA Co.,Ltd. All Rights Reserved. let x = 42 var copy = x withUnsafePointer(to: &copy) { pointer in print(pointer.pointee) // 42 } XJUI6OTBGF1PJOUFS withUnsafePointer(to:_:) and withUnsafeBytes(of:_:) for immutable values SE-0205 Swift 4.1 ࢀরΛ౉͢

DeNA Co.,Ltd. All Rights Reserved. let x = 42 var copy = x withUnsafePointer(to: &copy) { pointer in print(pointer.pointee) // 42 } withUnsafePointer(to: x) { pointer in print(pointer.pointee) // 42 } XJUI6OTBGF1PJOUFS withUnsafePointer(to:_:) and withUnsafeBytes(of:_:) for immutable values SE-0205 Swift 4.1 Swift 4.2

DeNA Co.,Ltd. All Rights Reserved. let x = 42 var copy = x withUnsafePointer(to: &copy) { pointer in print(pointer.pointee) // 42 } withUnsafePointer(to: x) { pointer in print(pointer.pointee) // 42 } XJUI6OTBGF1PJOUFS withUnsafePointer(to:_:) and withUnsafeBytes(of:_:) for immutable values SE-0205 Swift 4.1 ௚઀YΛ౉ͤΔΑ͏ʹ Swift 4.2

DeNA Co.,Ltd. All Rights Reserved. struct Point { var x: Int var y: Int } struct Circle { var center: Point var radius: Int } MemoryLayout.offset(of: \Circle.center.x) // 0 MemoryLayout.offset(of: \Circle.center.y) // 8 MemoryLayout.offset(of: \Circle.radius) // 16 ϝϞϦͷΦϑηοτΛऔಘ Add an offset(of:) method to MemoryLayout SE-0210 Swift 4.2

DeNA Co.,Ltd. All Rights Reserved. struct Point { var x: Int var y: Int } struct Circle { var center: Point var radius: Int } MemoryLayout.offset(of: \Circle.center.x) // 0 MemoryLayout.offset(of: \Circle.center.y) // 8 MemoryLayout.offset(of: \Circle.radius) // 16 ϝϞϦͷΦϑηοτΛऔಘ Add an offset(of:) method to MemoryLayout SE-0210 ߏ଄ମ Swift 4.2

DeNA Co.,Ltd. All Rights Reserved. struct Point { var x: Int var y: Int } struct Circle { var center: Point var radius: Int } MemoryLayout.offset(of: \Circle.center.x) // 0 MemoryLayout.offset(of: \Circle.center.y) // 8 MemoryLayout.offset(of: \Circle.radius) // 16 ϝϞϦͷΦϑηοτΛऔಘ Add an offset(of:) method to MemoryLayout SE-0210 ,FZ1BUIͰϓϩύςΟΛࢦఆ Swift 4.2

DeNA Co.,Ltd. All Rights Reserved. struct Point { var x: Int var y: Int } struct Circle { var center: Point var radius: Int } MemoryLayout.offset(of: \Circle.center.x) // 0 MemoryLayout.offset(of: \Circle.center.y) // 8 MemoryLayout.offset(of: \Circle.radius) // 16 ϝϞϦͷΦϑηοτΛऔಘ Add an offset(of:) method to MemoryLayout SE-0210 Swift 4.2 .FNPSZ-BZPVUP⒎TFUʹ౉͢

DeNA Co.,Ltd. All Rights Reserved. struct Point { var x: Int var y: Int } struct Circle { var center: Point var radius: Int } MemoryLayout.offset(of: \Circle.center.x) // 0 MemoryLayout.offset(of: \Circle.center.y) // 8 MemoryLayout.offset(of: \Circle.radius) // 16 ← 0 byte ϝϞϦͷΦϑηοτΛऔಘ Add an offset(of:) method to MemoryLayout SE-0210 Point x y radius Int Int Int Circle ← 8 byte ← 16 byte

DeNA Co.,Ltd. All Rights Reserved. SE-0054 SE-0143 SE-0193 SE-0194 SE-0195 SE-0196 SE-0206 SE-0212 Abolish ImplicitlyUnwrappedOptional type Conditional conformances Cross-module inlining and specialization Derived Collection of Enum Cases Introduce User-defined "Dynamic Member Lookup" Types Compiler Diagnostic Directives Hashable Enhancements Compiler Version Directive ݴޠ࢓༷ 8ͭ

DeNA Co.,Ltd. All Rights Reserved. class Person: Hashable { let name: String let age: Int init(name: String, age: Int) { self.name = name self.age = age } static func == (lhs: Person, rhs: Person) -> Bool { return lhs.name == rhs.name && lhs.age == rhs.age } } ྫɿ1FSTPOΫϥεʹ)BTIBCMFΛద߹ Hashable Enhancements SE-0206 Swift 4.2

DeNA Co.,Ltd. All Rights Reserved. class Person: Hashable { let name: String let age: Int init(name: String, age: Int) { self.name = name self.age = age } static func == (lhs: Person, rhs: Person) -> Bool { return lhs.name == rhs.name && lhs.age == rhs.age } } ྫɿ1FSTPOΫϥεʹ)BTIBCMFΛద߹ Hashable Enhancements SE-0206 &RVBUBCMF΁ͷ४ڌ΋ඞཁ Swift 4.2

extension Person: Hashable { var hashValue: Int { return name.hashValue
^ age.hashValue &* 42 } } 116 Copyright (C) DeNA Co.,Ltd. All Rights Reserved. Copyright (C) DeNA Co.,Ltd. All Rights Reserved. Swift 4.1 Hashable Enhancements SE-0206 ྫɿ1FSTPOΫϥεʹ)BTIBCMFΛద߹ ࣗલͰϋογϡ஋Λܭࢉ͢Δඞཁ͕͋ͬͨ

^ age.hashValue &* 42 } } 117 Copyright (C) DeNA Co.,Ltd. All Rights Reserved. Copyright (C) DeNA Co.,Ltd. All Rights Reserved. extension Person: Hashable { func hash(into hasher: inout Hasher) { hasher.combine(name) hasher.combine(age) } } ྫɿ1FSTPOΫϥεʹ)BTIBCMFΛద߹ Hashable Enhancements SE-0206 Swift 4.1 Swift 4.2

^ age.hashValue &* 42 } } 118 Copyright (C) DeNA Co.,Ltd. All Rights Reserved. Copyright (C) DeNA Co.,Ltd. All Rights Reserved. extension Person: Hashable { func hash(into hasher: inout Hasher) { hasher.combine(name) hasher.combine(age) } } ྫɿ1FSTPOΫϥεʹ)BTIBCMFΛద߹ Hashable Enhancements SE-0206 Swift 4.1 Swift 4.2 ϋογϡ஋Λܭࢉ͢ΔΦϒδΣΫτ

^ age.hashValue &* 42 } } 119 Copyright (C) DeNA Co.,Ltd. All Rights Reserved. Copyright (C) DeNA Co.,Ltd. All Rights Reserved. extension Person: Hashable { func hash(into hasher: inout Hasher) { hasher.combine(name) hasher.combine(age) } } ྫɿ1FSTPOΫϥεʹ)BTIBCMFΛద߹ Hashable Enhancements SE-0206 Swift 4.1 DPNCJOFΛݺΜͰ͍͚͹0, Swift 4.2

Swift 4.1 ͷ৔߹ 122 Copyright (C) DeNA Co.,Ltd. All Rights

DeNA Co.,Ltd. All Rights Reserved. enum Signal { case blue case yellow case red } extension Signal { static var all: [Signal] { return [.blue, .yellow, .red] } static var count: Int { return all.count } } Signal.all // [.blue, .yellow, .red] Signal.all.count // 3 FOVNͷྻڍʢ4XJGUʣ Derived Collection of Enum Cases SE-0194 Swift 4.1

DeNA Co.,Ltd. All Rights Reserved. enum Signal { case blue case yellow case red } extension Signal { static var all: [Signal] { return [.blue, .yellow, .red] } static var count: Int { return all.count } } Signal.all // [.blue, .yellow, .red] Signal.all.count // 3 FOVNͷྻڍʢ4XJGUʣ Derived Collection of Enum Cases SE-0194 BMMͱDPVOUΛࣗ෼Ͱ࣮૷ Swift 4.1

DeNA Co.,Ltd. All Rights Reserved. enum Signal { case blue case yellow case red } extension Signal { static var all: [Signal] { return [.blue, .yellow, .red] } static var count: Int { return all.count } } Signal.all // [.blue, .yellow, .red] Signal.all.count // 3 FOVNͷྻڍʢ4XJGUʣ Derived Collection of Enum Cases SE-0194 मਖ਼࿙Ε͕ൃੜ͢ΔՄೳੑʜ Swift 4.1

Swift 4.2 ͷ৔߹ 126 Copyright (C) DeNA Co.,Ltd. All Rights

DeNA Co.,Ltd. All Rights Reserved. enum Signal: CaseIterable { case blue case yellow case red } Signal.allCases // [.blue, .yellow, .red] Signal.allCases.count // 3 FOVNͷྻڍʢ4XJGUʣ Derived Collection of Enum Cases SE-0194 Swift 4.2

DeNA Co.,Ltd. All Rights Reserved. enum Signal: CaseIterable { case blue case yellow case red } Signal.allCases // [.blue, .yellow, .red] Signal.allCases.count // 3 FOVNͷྻڍʢ4XJGUʣ Derived Collection of Enum Cases SE-0194 $BTF*UFSBCMFΛ࣮૷ Swift 4.2

DeNA Co.,Ltd. All Rights Reserved. enum Signal: CaseIterable { case blue case yellow case red } Signal.allCases // [.blue, .yellow, .red] Signal.allCases.count // 3 FOVNͷྻڍʢ4XJGUʣ Derived Collection of Enum Cases SE-0194 BMM$BTFTͰྻڍͰ͖Δʂ Swift 4.2

DeNA Co.,Ltd. All Rights Reserved. FOVNͷྻڍʢ4XJGUʣ Derived Collection of Enum Cases SE-0194 • FOVNʹBTTPDJBUFEWBMVFT͕͋Δ৔߹͸  BMM$BTFTΛࣗ෼Ͱ࣮૷͢Δඞཁ͋Γ enum Signal: CaseIterable { case blue case yellow case red } Signal.allCases // [.blue, .yellow, .red] Signal.allCases.count // 3 Swift 4.2

DeNA Co.,Ltd. All Rights Reserved. enum Week: String, CaseIterable { case sunday, monday, tuesday, wednesday, thursday, friday, saturday static var allCases: [Week] { return [.sunday, .saturday] } } Week.allCases.map { $0.rawValue } // [.sunday, .saturday] BMM$BTFTͷΧελϚΠζ Derived Collection of Enum Cases SE-0194 Swift 4.2

enum Week: String, CaseIterable { case sunday, monday, tuesday, wednesday,
thursday, friday, saturday static var allCases: [Week] { return [.sunday, .saturday] } } Week.allCases.map { $0.rawValue } // [.sunday, .saturday] 133 Copyright (C) DeNA Co.,Ltd. All Rights Reserved. Copyright (C) DeNA Co.,Ltd. All Rights Reserved. BMM$BTFTͷΧελϚΠζ Derived Collection of Enum Cases SE-0194 BMM$BTFTΛ࣮૷ͯ͠഑ྻΛฦ͢ Swift 4.2

DeNA Co.,Ltd. All Rights Reserved. ίϯύΠϧஈ֊Ͱ֬ఆͯ͠ͳ͍ϓϩύςΟʹ  υοτه๏ͰΞΫηεͰ͖Δ࢓૊Έ ֓ཁ Introduce User-defined "Dynamic Member Lookup" Types SE-0195 %ZOBNJD.FNCFS-PPLVQ • $ISJT-BUUOFS͕ఏҊɾ࣮૷ • +40/΍֎෦ݴޠͷݺͼग़͠ʢ''*ʣͳͲʹ

DeNA Co.,Ltd. All Rights Reserved. @dynamicMemberLookup struct Plist { let plist = [ “version" : "1.0" ] subscript(dynamicMember key: String) -> String { return plist[key] ?? "-" } } let plist = Plist() plist.version // 1.0 plist.name // - ྫɿQMJTUʹ҆શʹΞΫηε Introduce User-defined "Dynamic Member Lookup" Types SE-0195 Swift 4.2

DeNA Co.,Ltd. All Rights Reserved. @dynamicMemberLookup struct Plist { let plist = [ “version" : "1.0" ] subscript(dynamicMember key: String) -> String { return plist[key] ?? "-" } } let plist = Plist() plist.version // 1.0 plist.name // - ྫɿQMJTUʹ҆શʹΞΫηε Introduce User-defined "Dynamic Member Lookup" Types SE-0195 ଐੑΛఆٛ Swift 4.2

DeNA Co.,Ltd. All Rights Reserved. @dynamicMemberLookup struct Plist { let plist = [ “version" : "1.0" ] subscript(dynamicMember key: String) -> String { return plist[key] ?? "-" } } let plist = Plist() plist.version // 1.0 plist.name // - ྫɿQMJTUʹ҆શʹΞΫηε Introduce User-defined "Dynamic Member Lookup" Types SE-0195 EZOBNJD.FNCFS Swift 4.2

DeNA Co.,Ltd. All Rights Reserved. @dynamicMemberLookup struct Plist { let plist = [ “version" : "1.0" ] subscript(dynamicMember key: String) -> String { return plist[key] ?? "-" } } let plist = Plist() plist.version // 1.0 plist.name // - ྫɿQMJTUʹ҆શʹΞΫηε Introduce User-defined "Dynamic Member Lookup" Types SE-0195 ରԠ͢ΔΩʔ͕ແ͔ͬͨΒσϑΥϧτ஋ Swift 4.2

DeNA Co.,Ltd. All Rights Reserved. @dynamicMemberLookup struct Plist { let plist = [ “version" : "1.0" ] subscript(dynamicMember key: String) -> String { return plist[key] ?? "-" } } let plist = Plist() plist.version // 1.0 plist.name // - ྫɿQMJTUʹ҆શʹΞΫηε Introduce User-defined "Dynamic Member Lookup" Types SE-0195 ϓϩύςΟͷΑ͏ʹΞΫηεͰ͖Δ Swift 4.2

DeNA Co.,Ltd. All Rights Reserved. // import pickle let pickle = Python.get(member: "import")("pickle") // file = open(filename) let file = Python.get(member: "open")(filename) // blob = file.read() let blob = file.get(member: "read")() // result = pickle.loads(blob) let result = pickle.get(member: "loads")(blob) 4XJGU Introduce User-defined "Dynamic Member Lookup" Types SE-0195

DeNA Co.,Ltd. All Rights Reserved. // import pickle let pickle = Python.get(member: "import")("pickle") // file = open(filename) let file = Python.get(member: "open")(filename) // blob = file.read() let blob = file.get(member: "read")() // result = pickle.loads(blob) let result = pickle.get(member: "loads")(blob) 4XJGU Introduce User-defined "Dynamic Member Lookup" Types SE-0195 ϝιουͳͲΛ͢΂ͯจࣈྻͰࢦఆ

DeNA Co.,Ltd. All Rights Reserved. // import pickle let pickle = Python.import("pickle") // file = open(filename) let file = Python.open(filename) // blob = file.read() let blob = file.read() // result = pickle.loads(blob) let result = pickle.loads(blob) 4XJGU Introduce User-defined "Dynamic Member Lookup" Types SE-0195

DeNA Co.,Ltd. All Rights Reserved. // import pickle let pickle = Python.import("pickle") // file = open(filename) let file = Python.open(filename) // blob = file.read() let blob = file.read() // result = pickle.loads(blob) let result = pickle.loads(blob) 4XJGU Introduce User-defined "Dynamic Member Lookup" Types SE-0195 ݩͷ1ZUIPOίʔυͱ΄΅ಉ͡ʹ

DeNA Co.,Ltd. All Rights Reserved. let xs: [Int!] = [1, 2, 3] type(of: xs) // Array<ImplicitlyUnwrappedOptional<Int>>.Type <*OU>ͷܕ͸Կ͔ʁ Abolish ImplicitlyUnwrappedOptional type SE-0054 Swift 4.1 *NQMJDJUMZ6OXSBQQFE0QUJPOBM*OU

DeNA Co.,Ltd. All Rights Reserved. let xs: [Int!] = [1, 2, 3] type(of: xs) // Array<ImplicitlyUnwrappedOptional<Int>>.Type type(of: xs) // Array<Optional<Int>>.Type <*OU>ͷܕ͸Կ͔ʁ Abolish ImplicitlyUnwrappedOptional type SE-0054 Swift 4.1 Swift 4.2

DeNA Co.,Ltd. All Rights Reserved. let xs: [Int!] = [1, 2, 3] type(of: xs) // Array<ImplicitlyUnwrappedOptional<Int>>.Type type(of: xs) // Array<Optional<Int>>.Type <*OU>ͷܕ͸Կ͔ʁ Abolish ImplicitlyUnwrappedOptional type SE-0054 Swift 4.1 0QUJPOBM*OU Swift 4.2

DeNA Co.,Ltd. All Rights Reserved. let xs: [Int!] = [1, 2, 3] type(of: xs) // Array<ImplicitlyUnwrappedOptional<Int>>.Type type(of: xs) // Array<Optional<Int>>.Type <*OU>ͷܕ͸Կ͔ʁ Abolish ImplicitlyUnwrappedOptional type SE-0054 Swift 4.1 Swift 4.2 • ɹ*NQMJDJUMZ6OXSBQQFE0QUJPOBM*OU • ɹ0QUJPOBM*OU

DeNA Co.,Ltd. All Rights Reserved. protocol Drinkable { func drink() } struct Curry: Drinkable { func drink() { print("ΧϨʔ͸ҿΈ෺ʂ") } } extension Array: Drinkable where Element: Drinkable { func drink() { for x in self { x.drink() } } } ྫɿཁૉ͕ʮҿΊΔʯͳΒ͹શମͱͯ͠΋ʮҿΊΔʯ Conditional conformances SE-0143 Swift 4.2

DeNA Co.,Ltd. All Rights Reserved. protocol Drinkable { func drink() } struct Curry: Drinkable { func drink() { print("ΧϨʔ͸ҿΈ෺ʂ") } } extension Array: Drinkable where Element: Drinkable { func drink() { for x in self { x.drink() } } } ྫɿཁૉ͕ʮҿΊΔʯͳΒ͹શମͱͯ͠΋ʮҿΊΔʯ Conditional conformances SE-0143 ʮҿΊΔʯΛදݱ͢Δϓϩτίϧ

DeNA Co.,Ltd. All Rights Reserved. protocol Drinkable { func drink() } struct Curry: Drinkable { func drink() { print("ΧϨʔ͸ҿΈ෺ʂ") } } extension Array: Drinkable where Element: Drinkable { func drink() { for x in self { x.drink() } } } ྫɿཁૉ͕ʮҿΊΔʯͳΒ͹શମͱͯ͠΋ʮҿΊΔʯ Conditional conformances SE-0143 ΧϨʔ͸΋ͪΖΜʮҿΈ෺ʯ

DeNA Co.,Ltd. All Rights Reserved. protocol Drinkable { func drink() } struct Curry: Drinkable { func drink() { print("ΧϨʔ͸ҿΈ෺ʂ") } } extension Array: Drinkable where Element: Drinkable { func drink() { for x in self { x.drink() } } } ྫɿཁૉ͕ʮҿΊΔʯͳΒ͹શମͱͯ͠΋ʮҿΊΔʯ Conditional conformances SE-0143 ΧϨʔࡼ͕ʮҿΈ෺ʯͰ͋Ε͹ɺԿࡼͰ΋ʮҿΈ෺ʯ

DeNA Co.,Ltd. All Rights Reserved. let items: Any = [Curry(), Curry(), Curry()] if let drinks = items as? Drinkable { drinks.drink() } ࣮ߦ࣌ʹ1SPUPDPM΁ͷ४ڌΛ൑ఆ Conditional conformances SE-0143 Swift 4.1 <$VSSZ>Λ"OZͰએݴ

DeNA Co.,Ltd. All Rights Reserved. let items: Any = [Curry(), Curry(), Curry()] if let drinks = items as? Drinkable { drinks.drink() } ࣮ߦ࣌ʹ1SPUPDPM΁ͷ४ڌΛ൑ఆ Conditional conformances SE-0143 Swift 4.1 %SJOLBCMFʹ४ڌ͍ͯ͠Δ͔ʁ

DeNA Co.,Ltd. All Rights Reserved. let items: Any = [Curry(), Curry(), Curry()] if let drinks = items as? Drinkable { drinks.drink() } ࣮ߦ࣌ʹ1SPUPDPM΁ͷ४ڌΛ൑ఆ Conditional conformances SE-0143 Swift 4.1 warning: Swift runtime does not yet support dynamically querying conditional conformance Ͱ͸ਖ਼͘͠൑ఆͰ͖ͳ͔ͬͨ

let items: Any = [Curry(), Curry(), Curry()] if let drinks
= items as? Drinkable { drinks.drink() } // ΧϨʔ͸ҿΈ෺ʂ // ΧϨʔ͸ҿΈ෺ʂ // ΧϨʔ͸ҿΈ෺ʂ 179 Copyright (C) DeNA Co.,Ltd. All Rights Reserved. Copyright (C) DeNA Co.,Ltd. All Rights Reserved. ࣮ߦ࣌ʹ1SPUPDPM΁ͷ४ڌΛ൑ఆ Conditional conformances SE-0143 Ͱ͸ҿΊΔΑ͏ʹʂ Swift 4.2

DeNA Co.,Ltd. All Rights Reserved. struct User: Hashable { var name: String var pets: [String] } • ཁૉ͕)BTIBCMFͰ͋Ε͹ɺ഑ྻ΋)BTIBCMFʹద߹ • 0QUJPOBMɺ%JDUJPOBSZɺ3BOHFͳͲʹ͍ͭͯ΋ಉ༷ ྫɿߏ଄ମ΁ͷ)BTIBCMFద߹ Conditional conformances SE-0143 ⭕ͳΒ͜ͷ··Ͱ0,ʂ Swift 4.2

DeNA Co.,Ltd. All Rights Reserved. #warning("औಘͨ͠APIΩʔΛઃఆ͍ͯͩ͘͠͞ɻ") let apiKey = "" #error("ίʔϧόοΫURLΛઃఆ͢Δඞཁ͕͋Γ·͢ɻ") let callbackURL = "" ίϯύΠϥɾσΟϨΫςΟϒ Compiler Diagnostic Directives SE-0196 XBSOJOHͰܯࠂ Swift 4.2

DeNA Co.,Ltd. All Rights Reserved. #warning("औಘͨ͠APIΩʔΛઃఆ͍ͯͩ͘͠͞ɻ") let apiKey = "" #error("ίʔϧόοΫURLΛઃఆ͢Δඞཁ͕͋Γ·͢ɻ") let callbackURL = "" ίϯύΠϥɾσΟϨΫςΟϒ Compiler Diagnostic Directives SE-0196 FSSPSͰίϯύΠϧΤϥʔ Swift 4.2

DeNA Co.,Ltd. All Rights Reserved. ίϯύΠϥɾσΟϨΫςΟϒ Compiler Diagnostic Directives SE-0196 #warning("औಘͨ͠APIΩʔΛઃఆ͍ͯͩ͘͠͞ɻ") let apiKey = "" #error("ίʔϧόοΫURLΛઃఆ͢Δඞཁ͕͋Γ·͢ɻ") let callbackURL = "" ར༻ྫɿαϯϓϧίʔυʹهड़ Swift 4.2

DeNA Co.,Ltd. All Rights Reserved. #if swift(>=4.1) || (swift(>=3.3) && !swift(>=4.0)) // ίϯύΠϥ 4.1 Ҏ্Ͱ༗ޮͳίʔυ #endif Compiler Version Directive SE-0212 4XJGUίϯύΠϥ Λ൑ఆ Swift --swift-version 3 --swift-version 4 4.0 3.2 4.0 4.1 3.3 4.1 4.2 3.4 4.1.5 Swift 4.2

DeNA Co.,Ltd. All Rights Reserved. #if swift(>=4.1) || (swift(>=3.3) && !swift(>=4.0)) // ίϯύΠϥ 4.1 Ҏ্Ͱ༗ޮͳίʔυ #endif Compiler Version Directive SE-0212 Swift --swift-version 3 --swift-version 4 4.0 3.2 4.0 4.1 3.3 4.1 4.2 3.4 4.1.5 4XJGUίϯύΠϥ Λ൑ఆ ޓ׵Ϟʔυ΋ؚΊͨ4XJGUόʔδϣϯͰ൑ఆ Swift 4.2

func add(_ x: Int, _ y: Int) -> Int {
return x + y } add(1, 2) 203 Copyright (C) DeNA Co.,Ltd. All Rights Reserved. Copyright (C) DeNA Co.,Ltd. All Rights Reserved. ΠϯϥΠϯԽ Cross-module inlining and specialization SE-0193 ؔ਺ݺͼग़͠ͷΦʔόʔϔουֻ͕͔Δ Swift 4.2

return x + y } add(1, 2) 204 Copyright (C) DeNA Co.,Ltd. All Rights Reserved. Copyright (C) DeNA Co.,Ltd. All Rights Reserved. ΠϯϥΠϯԽ 1 + 2 Cross-module inlining and specialization SE-0193 Swift 4.2 Swift 4.2

return x + y } add(1, 2) 205 Copyright (C) DeNA Co.,Ltd. All Rights Reserved. Copyright (C) DeNA Co.,Ltd. All Rights Reserved. ΠϯϥΠϯԽ 1 + 2 Cross-module inlining and specialization SE-0193 Swift 4.2 Swift 4.2 ؔ਺ͷຊମίʔυΛల։

DeNA Co.,Ltd. All Rights Reserved. public class Counter { @usableFromInline var count: Int = 0 public init() {} @inlinable public func add() -> Int { count += 1 return count } } !JOMJOBCMF Cross-module inlining and specialization SE-0193 Swift 4.2

DeNA Co.,Ltd. All Rights Reserved. public class Counter { @usableFromInline var count: Int = 0 public init() {} @inlinable public func add() -> Int { count += 1 return count } } !JOMJOBCMF Cross-module inlining and specialization SE-0193 ؔ਺ͷΠϯϥΠϯԽΛએݴ Swift 4.2

DeNA Co.,Ltd. All Rights Reserved. public class Counter { @usableFromInline var count: Int = 0 public init() {} @inlinable public func add() -> Int { count += 1 return count } } !JOMJOBCMF Cross-module inlining and specialization SE-0193 !JOMJOBCMFͳؔ਺͔Βར༻͞ΕΔ৔߹ʹඞཁ Swift 4.2

DeNA Co.,Ltd. All Rights Reserved. public class Counter { @usableFromInline var count: Int = 0 public init() {} @inlinable public func add() -> Int { count += 1 return count } } !JOMJOBCMF • Ϟδϡʔϧ֎͔Βݺͼग़ͨ࣌͠ʹΠϯϥΠϯԽΛڐՄ • ࣮ࡍʹΠϯϥΠϯԽ͞ΕΔ͔͸ίϯύΠϥґଘ Cross-module inlining and specialization SE-0193 Swift 4.2

DeNA Co.,Ltd. All Rights Reserved. Swift Package Manager 3ͭ SE-0201 SE-0208 SE-0209 Package Manager Local Dependencies Package Manager System Library Targets Package Manager Swift Language Version API Update

DeNA Co.,Ltd. All Rights Reserved. import PackageDescription let package = Package( name: "Package", dependencies: [ .package(path: "/path/to/MyPackage", from: "1.0.0"), ], ... ) -PDBMύεʹ͋ΔґଘΛࢦఆ Package Manager Local Dependencies SE-0201 Swift 4.2

DeNA Co.,Ltd. All Rights Reserved. import PackageDescription let package = Package( name: "Package", dependencies: [ .package(path: "/path/to/MyPackage", from: "1.0.0"), ], ... ) -PDBMύεʹ͋ΔґଘΛࢦఆ Package Manager Local Dependencies SE-0201 -PDBMύεΛࢦఆՄೳʹ Swift 4.2

DeNA Co.,Ltd. All Rights Reserved. let package = Package( ... swiftLanguageVersions: [.v4_2, .version("5.0")] ) let package = Package( ... swiftLanguageVersions: [4] ) Swift 4.1 TXJGU-BOHVBHF7FSTJPOT Package Manager Swift Language Version API Update SE-0209 Swift 4.2

DeNA Co.,Ltd. All Rights Reserved. let package = Package( ... swiftLanguageVersions: [.v4_2, .version("5.0")] ) let package = Package( ... swiftLanguageVersions: [4] ) Swift 4.1 TXJGU-BOHVBHF7FSTJPOT Package Manager Swift Language Version API Update SE-0209 FOVNͷ഑ྻͰࢦఆ͢ΔΑ͏ʹ Swift 4.2

DeNA Co.,Ltd. All Rights Reserved. import PackageDescription let package = Package( ... targets: [ .systemLibrary( name: "CLibxml", pkgConfig: "libxml2" ) ] ) γεςϜϥΠϒϥϦͷࢦఆ Package Manager System Library Targets SE-0208 Swift 4.2

DeNA Co.,Ltd. All Rights Reserved. import PackageDescription let package = Package( ... targets: [ .systemLibrary( name: "CLibxml", pkgConfig: "libxml2" ) ] ) γεςϜϥΠϒϥϦͷࢦఆ Package Manager System Library Targets SE-0208 5BSHFUͰ௚઀ࢦఆ Swift 4.2

Swift is evolving 240 Copyright (C) DeNA Co.,Ltd. All Rights

Swift 4.2 はどのような進化をしているのか/whats-new-swift42

Swift 4.2 はどのような進化をしているのか/whats-new-swift42

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