initial

Pods/SnapKit/Sources/ConstraintItem.swift

@@ -0,0 +1,61 @@
+//
+//  SnapKit
+//
+//  Copyright (c) 2011-Present SnapKit Team - https://github.com/SnapKit
+//
+//  Permission is hereby granted, free of charge, to any person obtaining a copy
+//  of this software and associated documentation files (the "Software"), to deal
+//  in the Software without restriction, including without limitation the rights
+//  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+//  copies of the Software, and to permit persons to whom the Software is
+//  furnished to do so, subject to the following conditions:
+//
+//  The above copyright notice and this permission notice shall be included in
+//  all copies or substantial portions of the Software.
+//
+//  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+//  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+//  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+//  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+//  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+//  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+//  THE SOFTWARE.
+
+#if os(iOS) || os(tvOS)
+    import UIKit
+#else
+    import AppKit
+#endif
+
+
+public final class ConstraintItem {
+    
+    internal weak var target: AnyObject?
+    internal let attributes: ConstraintAttributes
+    
+    internal init(target: AnyObject?, attributes: ConstraintAttributes) {
+        self.target = target
+        self.attributes = attributes
+    }
+    
+    internal var layoutConstraintItem: LayoutConstraintItem? {
+        return self.target as? LayoutConstraintItem
+    }
+    
+}
+
+public func ==(lhs: ConstraintItem, rhs: ConstraintItem) -> Bool {
+    // pointer equality
+    guard lhs !== rhs else {
+        return true
+    }
+    
+    // must both have valid targets and identical attributes
+    guard let target1 = lhs.target,
+          let target2 = rhs.target,
+          target1 === target2 && lhs.attributes == rhs.attributes else {
+            return false
+    }
+    
+    return true
+}