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Swift Album
ver.4.1
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Swift
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apple/swift
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What’s happen in
Swift4.1??
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ezura
• iOS engineer @ LINE
• Advent calendar 2017
• Ͳ͏ͯͦ͠ͷػೳ/༷Swiftʹͳ͍ͷʁ
• Swift4.1+
@eduraaa
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ezura
• iOS engineer @ LINE
• Advent calendar 2017
• Ͳ͏ͯͦ͠ͷػೳ/༷Swiftʹͳ͍ͷʁ
• Swift4.1+
@eduraaa
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Topics
• `Equatable`/`Hashable`ద߹ʹΑΔ`==`/`hashValue`ͷ҉త
࣮
• ಛఆͷ݅ԼͰͷϓϩτίϧద߹
• ࠶ىతͳϓϩτίϧ੍
• Unsafe[Mutable][Raw][Buffer]PointerͷAPIઃܭͷվળ
• ϓϩτίϧͰͷΦʔφʔγοϓͷએݴΛআ
• Unsafe[Mutable][Raw][Buffer]PointerͷAPIઃܭͷվળ
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Topics
• `Equatable`/`Hashable`ద߹ʹΑΔ`==`/`hashValue`ͷ҉త
࣮
• ಛఆͷ݅ԼͰͷϓϩτίϧద߹
• ࠶ىతͳϓϩτίϧ੍
• Unsafe[Mutable][Raw][Buffer]PointerͷAPIઃܭͷվળ
• ϓϩτίϧͰͷΦʔφʔγοϓͷએݴΛআ
• Unsafe[Mutable][Raw][Buffer]PointerͷAPIઃܭͷվળ
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`==`/`hashValue`ͷ
҉త࣮
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struct CustomType {
let v1: String
let v2: String
let v3: String
}
// CustomType instance == CustomType instance
customInstance1 == customInstance2
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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
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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
}
}
໌ࣔతʹ࣮͢Δඞཁ͕͋ͬͨ
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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
}
}
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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
}
}
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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߹
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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
}
}
}
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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߹
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conditional
conformance
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protocol P {}
struct S {}
extension S: P where T: P {}
ͱ͋Δ݅Λຬ͍ͨͯ͠Δ߹͚ͩ
ܕʹ Protocol ͕ద߹͞ΕΔ
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extension Array: Equatable where Element: Equatable {
static func ==(lhs: Array, rhs: Array) -> Bool {
…
}
}
`Element` ͕ `Equatable` ͷͱ͖
͕ࣗ `Equatable` ʹద߹
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ݱࡏ
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extension Array: Equatable where Element: Equatable {
static func ==(lhs: Array, rhs: Array) -> Bool {
…
}
}
ॻ͚ͳ͍ʂ
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Array == Array
[1, 2, 3] == [1, 2, 3]
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Array> == Array>
[[1, 2, 3]] == [[1, 2, 3]]
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Array> == Array>
[[1, 2, 3]] == [[1, 2, 3]]
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Array> == Array>
[[1, 2, 3]] == [[1, 2, 3]]
`==` ͰൺֱͰ͖Δ͚ΕͲ
`Array` ࣗମ `Equatable` Ͱͳ͍
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< Conditional conformances
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extension Array: Equatable where Element: Equatable {
static func ==(lhs: Array, rhs: Array) -> Bool {
…
}
}
`Element` ͕ `Equatable` ͷͱ͖
͕ࣗ `Equatable` ʹద߹
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Array> == Array>
[[1, 2, 3]] == [[1, 2, 3]]
`Array` ࣗମ `Equatable`
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ৄࡉͪ͜Β
LINE Advent Calendar 2017
Swift 4.1+
https://engineering.linecorp.com/ja/blog/detail/227