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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,14 @@ | ||
| @_spi(Advanced) | ||
| @propertyWrapper | ||
| public final class Weak<T: AnyObject> { | ||
| private weak var _wrappedValue: T? | ||
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| public var wrappedValue: T? { | ||
| get { _wrappedValue } | ||
| set { _wrappedValue = newValue } | ||
| } | ||
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| public init(wrappedValue: T? = nil) { | ||
| self._wrappedValue = wrappedValue | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,56 @@ | ||
| @_spi(Advanced) import SwiftUIIntrospect | ||
| import XCTest | ||
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| final class WeakTests: XCTestCase { | ||
| final class Foo {} | ||
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| var strongFoo: Foo? = Foo() | ||
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| func testInit_nil() { | ||
| @Weak var weakFoo: Foo? | ||
| XCTAssertNil(weakFoo) | ||
| } | ||
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| func testInit_nonNil() { | ||
| @Weak var weakFoo: Foo? = strongFoo | ||
| XCTAssertIdentical(weakFoo, strongFoo) | ||
| } | ||
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| func testAssignment_nilToNil() { | ||
| @Weak var weakFoo: Foo? | ||
| weakFoo = nil | ||
| XCTAssertNil(weakFoo) | ||
| } | ||
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| func testAssignment_nilToNonNil() { | ||
| @Weak var weakFoo: Foo? | ||
| let otherFoo = Foo() | ||
| weakFoo = otherFoo | ||
| XCTAssertIdentical(weakFoo, otherFoo) | ||
| } | ||
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| func testAssignment_nonNilToNil() { | ||
| @Weak var weakFoo: Foo? = strongFoo | ||
| weakFoo = nil | ||
| XCTAssertNil(weakFoo) | ||
| } | ||
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| func testAssignment_nonNilToNonNil() { | ||
| @Weak var weakFoo: Foo? = strongFoo | ||
| let otherFoo = Foo() | ||
| weakFoo = otherFoo | ||
| XCTAssertIdentical(weakFoo, otherFoo) | ||
| } | ||
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| func testIndirectAssignment_nonNilToNil() { | ||
| @Weak var weakFoo: Foo? = strongFoo | ||
| strongFoo = nil | ||
| XCTAssertNil(weakFoo) | ||
| } | ||
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| func testIndirectAssignment_nonNilToNonNil() { | ||
| @Weak var weakFoo: Foo? = strongFoo | ||
| strongFoo = Foo() | ||
| XCTAssertNil(weakFoo) | ||
| } | ||
| } |