CGSize extended initializers implemented

Author: bubski

Foundation/NSGeometry.swift

@@ -117,6 +117,20 @@ public struct CGSize {
     }
 }
 
+extension CGSize {
+    public static var zero: CGSize {
+        return CGSize(width: CGFloat(0), height: CGFloat(0))
+    }
+    
+    public init(width: Int, height: Int) {
+        self.init(width: CGFloat(width), height: CGFloat(height))
+    }
+    
+    public init(width: Double, height: Double) {
+        self.init(width: CGFloat(width), height: CGFloat(height))
+    }
+}
+
 extension CGSize: Equatable {
     public static func ==(lhs: CGSize, rhs: CGSize) -> Bool {
         return lhs.width == rhs.width && lhs.height == rhs.height

TestFoundation/TestNSGeometry.swift

@@ -29,6 +29,7 @@ class TestNSGeometry : XCTestCase {
             ("test_CGPoint_BasicConstruction", test_CGPoint_BasicConstruction),
             ("test_CGPoint_ExtendedConstruction", test_CGPoint_ExtendedConstruction),
             ("test_CGSize_BasicConstruction", test_CGSize_BasicConstruction),
+            ("test_CGSize_ExtendedConstruction", test_CGSize_ExtendedConstruction),
             ("test_CGRect_BasicConstruction", test_CGRect_BasicConstruction),
             ("test_NSEdgeInsets_BasicConstruction", test_NSEdgeInsets_BasicConstruction),
             ("test_NSEdgeInsetsEqual", test_NSEdgeInsetsEqual),
@@ -137,6 +138,20 @@ class TestNSGeometry : XCTestCase {
         XCTAssertEqual(s2.width, CGFloat(3.6))
         XCTAssertEqual(s2.height, CGFloat(4.5))
     }
+    
+    func test_CGSize_ExtendedConstruction() {
+        let s1 = CGSize.zero
+        XCTAssertEqual(s1.width, CGFloat(0))
+        XCTAssertEqual(s1.height, CGFloat(0))
+        
+        let s2 = CGSize(width: Int(3), height: Int(4))
+        XCTAssertEqual(s2.width, CGFloat(3))
+        XCTAssertEqual(s2.height, CGFloat(4))
+        
+        let s3 = CGSize(width: Double(3.6), height: Double(4.5))
+        XCTAssertEqual(s3.width, CGFloat(3.6))
+        XCTAssertEqual(s3.height, CGFloat(4.5))
+    }
 
     func test_CGRect_BasicConstruction() {
         let r1 = CGRect()