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Copyright © 2023 treastrain / Tanaka RyogaɹAll rights reserved.
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potatotips #81
iOS / Android ։ൃ Tips ڞ༗ձ
#potatotips
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Copyright © 2023 treastrain / Tanaka RyogaɹAll rights reserved.
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Copyright © 2023 treastrain / Tanaka RyogaɹAll rights reserved.
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Copyright © 2023 treastrain / Tanaka RyogaɹAll rights reserved.
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Copyright © 2023 treastrain / Tanaka RyogaɹAll rights reserved.
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protocol Fruit {}
struct Apple: Fruit {}
struct Banana: Fruit {}
func fruit1() -> Fruit {
Apple()
}
var fruit2: Fruit = fruit1()
fruit2 = Banana() // ✅
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Copyright © 2023 treastrain / Tanaka RyogaɹAll rights reserved.
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protocol Fruit {}
struct Apple: Fruit {}
struct Banana: Fruit {}
// Swift 5.1+
func fruit3() -> some Fruit {
Apple()
}
// Swift 5.7+
var fruit4: some Fruit = fruit3()
fruit4 = Banana() // ❌ Cannot assign value of type 'Banana' to type 'some Fruit'
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Copyright © 2023 treastrain / Tanaka RyogaɹAll rights reserved.
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protocol Fruit {}
struct Apple: Fruit {}
struct Banana: Fruit {}
// Swift 5.6+
func fruit5() -> any Fruit {
Apple()
}
// Swift 5.6+
var fruit6: any Fruit = fruit5()
fruit6 = Banana() // ✅
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Copyright © 2023 treastrain / Tanaka RyogaɹAll rights reserved.
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protocol Fruit {}
func fruit1() -> Fruit { /* ... */ }
var fruit2: Fruit = fruit1()
protocol Fruit {}
func fruit5() -> any Fruit { /* ... */ }
var fruit6: any Fruit = fruit5()
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protocol Fruit {}
func fruit1() -> Fruit { /* ... */ }
var fruit2: Fruit = fruit1()
protocol Fruit {}
func fruit5() -> any Fruit { /* ... */ }
var fruit6: any Fruit = fruit5()
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Copyright © 2023 treastrain / Tanaka RyogaɹAll rights reserved.
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Copyright © 2023 treastrain / Tanaka RyogaɹAll rights reserved. 11
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Copyright © 2023 treastrain / Tanaka RyogaɹAll rights reserved.
-enable-upcoming-feature ExistentialAny
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protocol Fruit {}
func fruit1() -> Fruit { /* ... */ }
var fruit2: Fruit = fruit1()
protocol Fruit {}
func fruit5() -> any Fruit { /* ... */ }
var fruit6: any Fruit = fruit5()
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Copyright © 2023 treastrain / Tanaka RyogaɹAll rights reserved.
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Copyright © 2023 treastrain / Tanaka RyogaɹAll rights reserved.
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// PackageDescription 5.8+
public struct SwiftSetting: Encodable {
// ...
@available(_PackageDescription, introduced: 5.8)
public static func enableUpcomingFeature(
_ name: String,
_ condition: BuildSettingCondition? = nil
) -> SwiftSetting
// ...
}
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Copyright © 2023 treastrain / Tanaka RyogaɹAll rights reserved.
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// swift-tools-version: 5.8
import PackageDescription
let package = Package(
name: "MyPackage",
// ...
targets: [
.target(
name: "MyTarget",
swiftSettings: [
.enableUpcomingFeature("ExistentialAny", .when(configuration: .debug)),
]
),
]
// ...
)
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Copyright © 2023 treastrain / Tanaka RyogaɹAll rights reserved.
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Copyright © 2023 treastrain / Tanaka RyogaɹAll rights reserved.
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Copyright © 2023 treastrain / Tanaka RyogaɹAll rights reserved.
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potatotips #81
iOS / Android ։ൃ Tips ڞ༗ձ
#potatotips