Swift Album ver.4.1

Transcript

1. Swift Album
 ver.4.1
2. Swift
3. apple/swift
4. What’s happen in Swift4.1??
5. ezura • iOS engineer @ LINE • Advent calendar 2017 • Ͳ͏ͯͦ͠ͷػೳ/࢓༷͸Swiftʹͳ͍ͷʁ • Swift4.1+ @eduraaa
6. ezura • iOS engineer @ LINE • Advent calendar 2017 • Ͳ͏ͯͦ͠ͷػೳ/࢓༷͸Swiftʹͳ͍ͷʁ • Swift4.1+ @eduraaa
7. Topics • `Equatable`/`Hashable`ద߹ʹΑΔ`==`/`hashValue`ͷ҉໧త ࣮૷ • ಛఆͷ৚݅ԼͰͷϓϩτίϧద߹ • ࠶ىతͳϓϩτίϧ੍໿ • Unsafe[Mutable][Raw][Buffer]PointerͷAPIઃܭͷվળ • ϓϩτίϧ಺ͰͷΦʔφʔγοϓͷએݴΛ࡟আ • Unsafe[Mutable][Raw][Buffer]PointerͷAPIઃܭͷվળ
8. Topics • `Equatable`/`Hashable`ద߹ʹΑΔ`==`/`hashValue`ͷ҉໧త ࣮૷ • ಛఆͷ৚݅ԼͰͷϓϩτίϧద߹ • ࠶ىతͳϓϩτίϧ੍໿ • Unsafe[Mutable][Raw][Buffer]PointerͷAPIઃܭͷվળ • ϓϩτίϧ಺ͰͷΦʔφʔγοϓͷએݴΛ࡟আ • Unsafe[Mutable][Raw][Buffer]PointerͷAPIઃܭͷվળ
9. `==`/`hashValue`ͷ
 ҉໧త࣮૷
10. struct CustomType { let v1: String let v2: String let v3: String } // CustomType instance == CustomType instance customInstance1 == customInstance2
11. struct CustomType { let v1: String let v2: String let v3: String } // CustomType instance == CustomType instance customInstance1 == customInstance2 error: binary operator '==' cannot be applied to two 'CustomType' operands
12. struct CustomType: Equatable { let v1: String let v2: String let v3: String static func ==(lhs: CustomType, rhs: CustomType) -> Bool { return lhs.v1 == rhs.v1 && lhs.v2 == rhs.v2 && lhs.v3 == rhs.v3 } } ໌ࣔతʹ࣮૷͢Δඞཁ͕͋ͬͨ
13. ੒௕
14. struct CustomType: Equatable { let v1: String let v2: String let v3: String static func ==(lhs: CustomType, rhs: CustomType) -> Bool { return lhs.v1 == rhs.v1 && lhs.v2 == rhs.v2 && lhs.v3 == rhs.v3 } }
15. struct CustomType: Equatable { let v1: String let v2: String let v3: String static func ==(lhs: CustomType, rhs: CustomType) -> Bool { return lhs.v1 == rhs.v1 && lhs.v2 == rhs.v2 && lhs.v3 == rhs.v3 } }
16. struct CustomType: Equatable { let v1: String let v2: String let v3: String static func ==(lhs: CustomType, rhs: CustomType) -> Bool { return lhs.v1 == rhs.v1 && lhs.v2 == rhs.v2 && lhs.v3 == rhs.v3 } } ৚݅: શͯ `Equatable` ʹద߹ ৚݅: એݴ෦Ͱ `Equatable` ʹద߹
17. enum Token: Equatable { case string(String) case number(Int) case lparen case rparen case custom(CustomType) static func == (lhs: Token, rhs: Token) -> Bool { switch (lhs, rhs) { case (.string(let lhsString), .string(let rhsString)): return lhsString == rhsString case (.number(let lhsNumber), .number(let rhsNumber)): return lhsNumber == rhsNumber case (.custom(let lhsCustom), .custom(let rhsCustom)): return lhsCustom == rhsCustom
 case (.lparen, .lparen), (.rparen, .rparen): return true default: return false } } }
18. enum Token: Equatable { case string(String) case number(Int) case lparen case rparen case custom(CustomType) static func == (lhs: Token, rhs: Token) -> Bool { switch (lhs, rhs) { case (.string(let lhsString), .string(let rhsString)): return lhsString == rhsString case (.number(let lhsNumber), .number(let rhsNumber)): return lhsNumber == rhsNumber case (.lparen, .lparen), (.rparen, .rparen): return true case (.custom(let lhsCustom), .custom(let rhsCustom)): return lhsCustom == rhsCustom default: return false } } } ৚݅: શͯ `Equatable` ʹద߹ ৚݅: એݴ෦Ͱ `Equatable` ʹద߹
19. conditional conformance
20. protocol P {} struct S<T> {} extension S: P where T: P {} ͱ͋Δ৚݅Λຬ͍ͨͯ͠Δ৔߹͚ͩ
 ܕʹ Protocol ͕ద߹͞ΕΔ
21. extension Array: Equatable where Element: Equatable { static func ==(lhs: Array<Element>, rhs: Array<Element>) -> Bool {
 … } } `Element` ͕ `Equatable` ͷͱ͖
 ࣗ਎͕ `Equatable` ʹద߹
22. ݱࡏ
23. extension Array: Equatable where Element: Equatable { static func ==(lhs: Array<Element>, rhs: Array<Element>) -> Bool {
 … } } ॻ͚ͳ͍ʂ
24. Array<Equtable ద߹ͷܕ> == Array<Equtable ద߹ͷܕ> 
 [1, 2, 3] == [1, 2, 3]
25. Array<Array<Equtable ద߹ͷܕ>> == Array<Array<Equtable ద߹ͷܕ>> 
 [[1, 2, 3]] == [[1, 2, 3]]
26. Array<Array<Equtable ద߹ͷܕ>> == Array<Array<Equtable ద߹ͷܕ>> 
 [[1, 2, 3]] == [[1, 2, 3]]
27. Array<Array<Equtable ద߹ͷܕ>> == Array<Array<Equtable ద߹ͷܕ>> 
 [[1, 2, 3]] == [[1, 2, 3]] `==` ͰൺֱͰ͖Δ͚ΕͲ
 `Array` ࣗମ͸ `Equatable` Ͱ͸ͳ͍
28. < Conditional conformances
29. extension Array: Equatable where Element: Equatable { static func ==(lhs: Array<Element>, rhs: Array<Element>) -> Bool {
 … } } `Element` ͕ `Equatable` ͷͱ͖
 ࣗ਎͕ `Equatable` ʹద߹
30. Array<Array<Equtable ద߹ͷܕ>> == Array<Array<Equtable ద߹ͷܕ>> 
 [[1, 2, 3]] == [[1, 2, 3]] `Array` ࣗମ΋ `Equatable`
31. ৄࡉ͸ͪ͜Β LINE Advent Calendar 2017
 Swift 4.1+
 https://engineering.linecorp.com/ja/blog/detail/227