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//===----------------------------------------------------------------------===//
//
// This source file is part of the Swift Atomics open source project
//
// Copyright (c) 2023 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See https://swift.org/LICENSE.txt for license information
// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
//
//===----------------------------------------------------------------------===//
import Atomics
import XCTest
private class Base: AtomicReference {
let value: Int
init(_ value: Int) {
self.value = value
}
}
private class Child: Base {}
private class Grandchild: Child {}
class StrongReferenceSubclass: XCTestCase {
func test_base_unsafe() {
let object = Child(42)
let v = UnsafeAtomic<Base>.create(object)
XCTAssertTrue(v.load(ordering: .relaxed) === object)
let object2 = Grandchild(23)
let o = v.exchange(object2, ordering: .relaxed)
XCTAssertTrue(o === object)
XCTAssertTrue(v.load(ordering: .relaxed) === object2)
let r = v.destroy()
XCTAssertTrue(r === object2)
}
func test_base_managed() {
let object = Child(42)
let v = ManagedAtomic<Base>(object)
XCTAssertTrue(v.load(ordering: .relaxed) === object)
let object2 = Grandchild(23)
let o = v.exchange(object2, ordering: .relaxed)
XCTAssertTrue(o === object)
XCTAssertTrue(v.load(ordering: .relaxed) === object2)
}
func test_optional_base_unsafe() {
let v = UnsafeAtomic<Base?>.create(nil)
XCTAssertTrue(v.load(ordering: .relaxed) == nil)
let object = Grandchild(23)
let o = v.exchange(object, ordering: .relaxed)
XCTAssertTrue(o == nil)
XCTAssertTrue(v.load(ordering: .relaxed) === object)
let r = v.destroy()
XCTAssertTrue(r === object)
}
func test_optional_base_managed() {
let v = ManagedAtomic<Base?>(nil)
XCTAssertTrue(v.load(ordering: .relaxed) == nil)
let object = Grandchild(23)
let o = v.exchange(object, ordering: .relaxed)
XCTAssertTrue(o == nil)
XCTAssertTrue(v.load(ordering: .relaxed) === object)
}
}
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