Added boolean XOR.

boinx · Dec 10, 2018 · 1811e83 · 1811e83
1 parent f5d8258
commit 1811e83
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diff --git a/BXSwiftUtils/Math & Geometry/Bool+Operators.swift b/BXSwiftUtils/Math & Geometry/Bool+Operators.swift
@@ -10,9 +10,11 @@ import Foundation
 
 infix operator ||= : AssignmentPrecedence
 infix operator &&= : AssignmentPrecedence
+infix operator ^^ : LogicalDisjunctionPrecedence
 
 extension Bool
 {
+	/// OR and assign
 	public static func ||= (lhs: inout Bool, rhs: @autoclosure () throws -> Bool) rethrows
 	{
 		if (!lhs)
@@ -21,11 +23,18 @@ extension Bool
 		}
 	}
 
+	// AND and assign
 	public static func &&= (lhs: inout Bool, rhs: @autoclosure () throws -> Bool) rethrows
 	{
 		if (lhs)
 		{
 			lhs = try rhs()
 		}
 	}
+
+	// XOR
+	public static func ^^ (lhs: Bool, rhs: Bool) -> Bool
+	{
+		return (lhs && !rhs) || (!lhs && rhs)
+	}
 }
diff --git a/BXSwiftUtilsTests/Math & Geometry/Bool+OperatorsTests.swift b/BXSwiftUtilsTests/Math & Geometry/Bool+OperatorsTests.swift
@@ -46,4 +46,50 @@ class Bool_OperatorsTests : XCTestCase
 		boolValue &&= false
 		XCTAssertFalse(boolValue) 	// 1 0 | 0
 	}
+
+	func testXOR()
+	{
+		var boolValue: Bool = false
+
+		boolValue = false ^^ false
+		XCTAssertFalse(boolValue) 	// 0 0 | 0
+
+		boolValue = false ^^ true
+		XCTAssertTrue(boolValue) 	// 0 1 | 1
+
+		boolValue = true ^^ false
+		XCTAssertTrue(boolValue) 	// 1 0 | 1
+
+		boolValue = true ^^ true
+		XCTAssertFalse(boolValue) 	// 1 1 | 0
+	}
+
+	func testXORPrecedenceLeftToRight() // same as right to left
+	{
+		var boolValue: Bool = false
+
+		boolValue = false ^^ false ^^ true
+		XCTAssertTrue(boolValue)
+
+		boolValue = false ^^ false ^^ false
+		XCTAssertFalse(boolValue)
+
+		boolValue = false ^^ true ^^ true
+		XCTAssertFalse(boolValue)
+
+		boolValue = false ^^ true ^^ false
+		XCTAssertTrue(boolValue)
+
+		boolValue = true ^^ false ^^ true
+		XCTAssertFalse(boolValue)
+
+		boolValue = true ^^ false ^^ false
+		XCTAssertTrue(boolValue)
+
+		boolValue = true ^^ true ^^ false
+		XCTAssertFalse(boolValue)
+
+		boolValue = true ^^ true ^^ true
+		XCTAssertTrue(boolValue)
+	}
 }