Add AnyHashable2 implementation (#190)

Author: Kyle-Ye

Sources/OpenSwiftUICore/Data/Other/AnyHashable2.swift

@@ -0,0 +1,88 @@
+//
+//  AnyHashable2.swift
+//  OpenSwiftUICore
+//
+//  Audited for iOS 18.0
+//  Status: Complete
+//  ID: 12EE2013F9611424839A13CDF1FE08D2 (SwiftUICore)
+
+fileprivate class AnyHashableBox {
+    func `as`<T>(type: T.Type) -> T? where T: Hashable { nil }
+    var description: String { "" }
+    var anyValue: any Hashable { preconditionFailure("") }
+    func isEqual(to other: AnyHashableBox) -> Bool { false }
+    func hash(into hasher: inout Hasher) {}
+}
+
+fileprivate class _AnyHashableBox<Value>: AnyHashableBox where Value: Hashable {
+    let value: Value
+    
+    init(_ value: Value) {
+        self.value = value
+    }
+    
+    override func `as`<T>(type: T.Type) -> T? where T: Hashable {
+        value as? T
+    }
+    
+    override var description: String {
+        String(describing: value)
+    }
+    
+    override var anyValue: any Hashable {
+        value
+    }
+    
+    override func isEqual(to other: AnyHashableBox) -> Bool {
+        guard let otherBox = other as? _AnyHashableBox<Value> else {
+            return false
+        }
+        return value == otherBox.value
+    }
+    
+    override func hash(into hasher: inout Hasher) {
+        hasher.combine(ObjectIdentifier(Value.self))
+        hasher.combine(value)
+    }
+}
+
+package struct AnyHashable2: Hashable, CustomStringConvertible {
+    private var box: AnyHashableBox
+    
+    package init<T>(_ value: T) where T: Hashable {
+        box = _AnyHashableBox(value)
+    }
+    
+    package func `as`<T>(type: T.Type) -> T? where T: Hashable {
+        box.as(type: type)
+    }
+    
+    package var anyValue: any Hashable {
+        box.anyValue
+    }
+    
+    package var anyHashable: AnyHashable {
+        AnyHashable(box.anyValue)
+    }
+    
+    package var description: String {
+        box.description
+    }
+    
+    package static func == (lhs: AnyHashable2, rhs: AnyHashable2) -> Bool {
+        guard lhs.box !== rhs.box else {
+            return true
+        }
+        return lhs.box.isEqual(to: rhs.box)
+    }
+      
+    package func hash(into hasher: inout Hasher) {
+        box.hash(into: &hasher)
+    }
+}
+
+extension AnyHashable2: _HasCustomAnyHashableRepresentation {
+    package func _toCustomAnyHashable() -> AnyHashable? {
+        anyHashable
+    }
+}

Sources/OpenSwiftUICore/Data/Other/BitVector.swift

@@ -4,7 +4,7 @@
 //
 //  Audited for iOS 18.0
 //  Status: Complete
-//  ID: 8433FC349A42D7F59B64CD7FA08D81A9
+//  ID: 8433FC349A42D7F59B64CD7FA08D81A9 (SwiftUICore)
 
 import Foundation
 

Tests/OpenSwiftUICoreTests/Data/Other/AnyHashable2Tests.swift

@@ -0,0 +1,34 @@
+//
+//  AnyHashable2Tests.swift
+//  OpenSwiftUICoreTests
+
+import OpenSwiftUICore
+import Testing
+
+struct AnyHashable2Tests {
+    @Test
+    func value() {
+        struct ValueA: Hashable {
+            var value: Int
+        }
+        
+        struct ValueB: Hashable {
+            var value: Int
+        }
+        
+        let valueA = ValueA(value: 1)
+        let valueB = ValueB(value: 1)
+        
+        let anyHashableA = AnyHashable(valueA)
+        let anyHashableB = AnyHashable(valueB)
+        
+        let anyHashable2A = AnyHashable2(valueA)
+        let anyHashable2B = AnyHashable2(valueB)
+        
+        #expect(anyHashableA.hashValue == anyHashableB.hashValue)
+        #expect(anyHashableA != anyHashableB)
+
+        #expect(anyHashable2A.hashValue != anyHashable2B.hashValue)
+        #expect(anyHashable2A != anyHashable2B)
+    }
+}