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Using property wrappers like this crashes Xcode
At least as of Xcode 11.5. Here's hoping 12 fixes it.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,37 +1,37 @@ | ||
| import Foundation | ||
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| @propertyWrapper | ||
| public struct Forgetful<Value> { | ||
| private var value: Value? | ||
| private let factory: () -> Value | ||
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| public var wrappedValue: Value { | ||
| mutating get { | ||
| guard let someValue = value else { | ||
| return given(factory()) { | ||
| value = $0 | ||
| } | ||
| } | ||
| return someValue | ||
| } | ||
| } | ||
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| public init(wrappedValue: @autoclosure @escaping () -> Value) { | ||
| factory = wrappedValue | ||
| } | ||
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| public mutating func forget() { | ||
| value = nil | ||
| } | ||
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| public var projectedValue: Self { | ||
| get { return self } | ||
| set { self = newValue } | ||
| } | ||
| } | ||
| //import Foundation | ||
| // | ||
| // | ||
| // | ||
| //@propertyWrapper | ||
| //public struct Forgetful<Value> { | ||
| // private var value: Value? | ||
| // private let factory: () -> Value | ||
| // | ||
| // | ||
| // public var wrappedValue: Value { | ||
| // mutating get { | ||
| // guard let someValue = value else { | ||
| // return given(factory()) { | ||
| // value = $0 | ||
| // } | ||
| // } | ||
| // return someValue | ||
| // } | ||
| // } | ||
| // | ||
| // | ||
| // public init(wrappedValue: @autoclosure @escaping () -> Value) { | ||
| // factory = wrappedValue | ||
| // } | ||
| // | ||
| // | ||
| // public mutating func forget() { | ||
| // value = nil | ||
| // } | ||
| // | ||
| // | ||
| // public var projectedValue: Self { | ||
| // get { return self } | ||
| // set { self = newValue } | ||
| // } | ||
| //} |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,73 +1,73 @@ | ||
| import XCTest | ||
| import BagOfTricks | ||
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| class ForgetfulTests: XCTestCase { | ||
| func testFactoryCalls() { | ||
| let factoryCalled = expectation(description: "Forgetful has reinitialized its value") | ||
| factoryCalled.expectedFulfillmentCount = 2 | ||
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| var subject = Forgetful<Int>(wrappedValue: { | ||
| factoryCalled.fulfill() | ||
| return 42 | ||
| }()) | ||
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| XCTAssertEqual(subject.wrappedValue, 42) | ||
| XCTAssertEqual(subject.wrappedValue, 42) | ||
| XCTAssertEqual(subject.wrappedValue, 42) | ||
| subject.forget() | ||
| XCTAssertEqual(subject.wrappedValue, 42) | ||
| XCTAssertEqual(subject.wrappedValue, 42) | ||
| XCTAssertEqual(subject.wrappedValue, 42) | ||
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| wait(for: [factoryCalled], timeout: 0) | ||
| } | ||
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| func testForgets() { | ||
| class Ref { | ||
| var value: String = "hello" | ||
| } | ||
| let ref = Ref() | ||
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| var subject = Forgetful(wrappedValue: ref.value) | ||
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| XCTAssertEqual(subject.wrappedValue, "hello") | ||
| ref.value = "foo" | ||
| XCTAssertEqual(subject.wrappedValue, "hello") | ||
| subject.forget() | ||
| XCTAssertEqual(subject.wrappedValue, "foo") | ||
| } | ||
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| func testLazy() { | ||
| let subject = Forgetful<Int>(wrappedValue: { | ||
| XCTFail() | ||
| return 42 | ||
| }()) | ||
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| XCTAssertNotNil(subject) | ||
| } | ||
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| func testLazyForget() { | ||
| let factoryCalled = expectation(description: "Forgetful has reinitialized its value") | ||
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| var subject = Forgetful<Int>(wrappedValue: { | ||
| factoryCalled.fulfill() | ||
| return 42 | ||
| }()) | ||
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| XCTAssertEqual(subject.wrappedValue, 42) | ||
| XCTAssertEqual(subject.wrappedValue, 42) | ||
| XCTAssertEqual(subject.wrappedValue, 42) | ||
| subject.forget() | ||
| subject.forget() | ||
| subject.forget() | ||
| subject.forget() | ||
| subject.forget() | ||
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| wait(for: [factoryCalled], timeout: 0) | ||
| } | ||
| } | ||
| //import XCTest | ||
| //import BagOfTricks | ||
| // | ||
| // | ||
| // | ||
| //class ForgetfulTests: XCTestCase { | ||
| // func testFactoryCalls() { | ||
| // let factoryCalled = expectation(description: "Forgetful has reinitialized its value") | ||
| // factoryCalled.expectedFulfillmentCount = 2 | ||
| // | ||
| // var subject = Forgetful<Int>(wrappedValue: { | ||
| // factoryCalled.fulfill() | ||
| // return 42 | ||
| // }()) | ||
| // | ||
| // XCTAssertEqual(subject.wrappedValue, 42) | ||
| // XCTAssertEqual(subject.wrappedValue, 42) | ||
| // XCTAssertEqual(subject.wrappedValue, 42) | ||
| // subject.forget() | ||
| // XCTAssertEqual(subject.wrappedValue, 42) | ||
| // XCTAssertEqual(subject.wrappedValue, 42) | ||
| // XCTAssertEqual(subject.wrappedValue, 42) | ||
| // | ||
| // wait(for: [factoryCalled], timeout: 0) | ||
| // } | ||
| // | ||
| // | ||
| // func testForgets() { | ||
| // class Ref { | ||
| // var value: String = "hello" | ||
| // } | ||
| // let ref = Ref() | ||
| // | ||
| // var subject = Forgetful(wrappedValue: ref.value) | ||
| // | ||
| // XCTAssertEqual(subject.wrappedValue, "hello") | ||
| // ref.value = "foo" | ||
| // XCTAssertEqual(subject.wrappedValue, "hello") | ||
| // subject.forget() | ||
| // XCTAssertEqual(subject.wrappedValue, "foo") | ||
| // } | ||
| // | ||
| // | ||
| // func testLazy() { | ||
| // let subject = Forgetful<Int>(wrappedValue: { | ||
| // XCTFail() | ||
| // return 42 | ||
| // }()) | ||
| // | ||
| // XCTAssertNotNil(subject) | ||
| // } | ||
| // | ||
| // | ||
| // func testLazyForget() { | ||
| // let factoryCalled = expectation(description: "Forgetful has reinitialized its value") | ||
| // | ||
| // var subject = Forgetful<Int>(wrappedValue: { | ||
| // factoryCalled.fulfill() | ||
| // return 42 | ||
| // }()) | ||
| // | ||
| // XCTAssertEqual(subject.wrappedValue, 42) | ||
| // XCTAssertEqual(subject.wrappedValue, 42) | ||
| // XCTAssertEqual(subject.wrappedValue, 42) | ||
| // subject.forget() | ||
| // subject.forget() | ||
| // subject.forget() | ||
| // subject.forget() | ||
| // subject.forget() | ||
| // | ||
| // wait(for: [factoryCalled], timeout: 0) | ||
| // } | ||
| //} |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,76 +1,76 @@ | ||
| import XCTest | ||
| import BagOfTricks | ||
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| private class Ref { | ||
| var value: String? | ||
| var count: Int = 0 | ||
| } | ||
| private let ref = Ref() | ||
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| class ForgetfulWrapperTests: XCTestCase { | ||
| // This strange formulation of passing the closure in a param instead of as a default value is [required by SR-10950](https://bugs.swift.org/browse/SR-10950). It will probably be fixed in the next Swift release following 5.1. | ||
| @Forgetful(wrappedValue: { | ||
| ref.count += 1 | ||
| return ref.value! | ||
| }()) var lazy: String | ||
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| override func setUp() { | ||
| ref.value = nil | ||
| ref.count = 0 | ||
| } | ||
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| func testIsLazy() { | ||
| XCTAssertNil(ref.value) | ||
| XCTAssertEqual(ref.count, 0) | ||
| ref.value = "foo" | ||
| XCTAssertEqual(lazy, "foo") | ||
| XCTAssertEqual(ref.count, 1) | ||
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| _ = lazy | ||
| _ = lazy | ||
| _ = lazy | ||
| XCTAssertEqual(ref.count, 1) | ||
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| ref.value = "bar" | ||
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| _ = lazy | ||
| XCTAssertEqual(lazy, "foo") | ||
| XCTAssertEqual(ref.count, 1) | ||
| } | ||
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| func testForget() { | ||
| ref.value = "foo" | ||
| _ = lazy | ||
| ref.value = "bar" | ||
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| $lazy.forget() | ||
| XCTAssertEqual(lazy, "bar") | ||
| XCTAssertEqual(ref.count, 2) | ||
| } | ||
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| func testForgetIsLazy() { | ||
| ref.value = "foo" | ||
| _ = lazy | ||
| ref.value = "bar" | ||
| _ = lazy | ||
| XCTAssertEqual(lazy, "foo") | ||
| XCTAssertEqual(ref.count, 1) | ||
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| $lazy.forget() | ||
| XCTAssertEqual(lazy, "bar") | ||
| XCTAssertEqual(ref.count, 2) | ||
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| _ = lazy | ||
| _ = lazy | ||
| _ = lazy | ||
| XCTAssertEqual(lazy, "bar") | ||
| XCTAssertEqual(ref.count, 2) | ||
| } | ||
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| } | ||
| //import XCTest | ||
| //import BagOfTricks | ||
| // | ||
| // | ||
| //private class Ref { | ||
| // var value: String? | ||
| // var count: Int = 0 | ||
| //} | ||
| //private let ref = Ref() | ||
| // | ||
| // | ||
| //class ForgetfulWrapperTests: XCTestCase { | ||
| // // This strange formulation of passing the closure in a param instead of as a default value is [required by SR-10950](https://bugs.swift.org/browse/SR-10950). It will probably be fixed in the next Swift release following 5.1. | ||
| // @Forgetful(wrappedValue: { | ||
| // ref.count += 1 | ||
| // return ref.value! | ||
| // }()) var lazy: String | ||
| // | ||
| // | ||
| // override func setUp() { | ||
| // ref.value = nil | ||
| // ref.count = 0 | ||
| // } | ||
| // | ||
| // | ||
| // func testIsLazy() { | ||
| // XCTAssertNil(ref.value) | ||
| // XCTAssertEqual(ref.count, 0) | ||
| // ref.value = "foo" | ||
| // XCTAssertEqual(lazy, "foo") | ||
| // XCTAssertEqual(ref.count, 1) | ||
| // | ||
| // _ = lazy | ||
| // _ = lazy | ||
| // _ = lazy | ||
| // XCTAssertEqual(ref.count, 1) | ||
| // | ||
| // ref.value = "bar" | ||
| // | ||
| // _ = lazy | ||
| // XCTAssertEqual(lazy, "foo") | ||
| // XCTAssertEqual(ref.count, 1) | ||
| // } | ||
| // | ||
| // | ||
| // func testForget() { | ||
| // ref.value = "foo" | ||
| // _ = lazy | ||
| // ref.value = "bar" | ||
| // | ||
| // $lazy.forget() | ||
| // XCTAssertEqual(lazy, "bar") | ||
| // XCTAssertEqual(ref.count, 2) | ||
| // } | ||
| // | ||
| // | ||
| // func testForgetIsLazy() { | ||
| // ref.value = "foo" | ||
| // _ = lazy | ||
| // ref.value = "bar" | ||
| // _ = lazy | ||
| // XCTAssertEqual(lazy, "foo") | ||
| // XCTAssertEqual(ref.count, 1) | ||
| // | ||
| // $lazy.forget() | ||
| // XCTAssertEqual(lazy, "bar") | ||
| // XCTAssertEqual(ref.count, 2) | ||
| // | ||
| // _ = lazy | ||
| // _ = lazy | ||
| // _ = lazy | ||
| // XCTAssertEqual(lazy, "bar") | ||
| // XCTAssertEqual(ref.count, 2) | ||
| // } | ||
| // | ||
| //} |