update readme

CacheCreek.xcodeproj/project.pbxproj

@@ -211,16 +211,18 @@
 			isa = PBXProject;
 			attributes = {
 				LastSwiftUpdateCheck = 0720;
-				LastUpgradeCheck = 0730;
+				LastUpgradeCheck = 0800;
 				TargetAttributes = {
 					30D75C221C57CE1400F4E62D = {
 						CreatedOnToolsVersion = 7.2;
+						LastSwiftMigration = 0800;
 					};
 					30D75C331C57D17400F4E62D = {
 						CreatedOnToolsVersion = 7.2;
 					};
 					30D75C401C57D2CA00F4E62D = {
 						CreatedOnToolsVersion = 7.2;
+						LastSwiftMigration = 0800;
 					};
 				};
 			};
@@ -310,7 +312,24 @@
 		30D75C1C1C57CD6100F4E62D /* Debug */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
+				CLANG_WARN_BOOL_CONVERSION = YES;
+				CLANG_WARN_CONSTANT_CONVERSION = YES;
+				CLANG_WARN_EMPTY_BODY = YES;
+				CLANG_WARN_ENUM_CONVERSION = YES;
+				CLANG_WARN_INFINITE_RECURSION = YES;
+				CLANG_WARN_INT_CONVERSION = YES;
+				CLANG_WARN_SUSPICIOUS_MOVE = YES;
+				CLANG_WARN_UNREACHABLE_CODE = YES;
+				CLANG_WARN__DUPLICATE_METHOD_MATCH = YES;
+				ENABLE_STRICT_OBJC_MSGSEND = YES;
 				ENABLE_TESTABILITY = YES;
+				GCC_NO_COMMON_BLOCKS = YES;
+				GCC_WARN_64_TO_32_BIT_CONVERSION = YES;
+				GCC_WARN_ABOUT_RETURN_TYPE = YES;
+				GCC_WARN_UNDECLARED_SELECTOR = YES;
+				GCC_WARN_UNINITIALIZED_AUTOS = YES;
+				GCC_WARN_UNUSED_FUNCTION = YES;
+				GCC_WARN_UNUSED_VARIABLE = YES;
 				ONLY_ACTIVE_ARCH = YES;
 			};
 			name = Debug;
@@ -318,6 +337,24 @@
 		30D75C1D1C57CD6100F4E62D /* Release */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
+				CLANG_WARN_BOOL_CONVERSION = YES;
+				CLANG_WARN_CONSTANT_CONVERSION = YES;
+				CLANG_WARN_EMPTY_BODY = YES;
+				CLANG_WARN_ENUM_CONVERSION = YES;
+				CLANG_WARN_INFINITE_RECURSION = YES;
+				CLANG_WARN_INT_CONVERSION = YES;
+				CLANG_WARN_SUSPICIOUS_MOVE = YES;
+				CLANG_WARN_UNREACHABLE_CODE = YES;
+				CLANG_WARN__DUPLICATE_METHOD_MATCH = YES;
+				ENABLE_STRICT_OBJC_MSGSEND = YES;
+				GCC_NO_COMMON_BLOCKS = YES;
+				GCC_WARN_64_TO_32_BIT_CONVERSION = YES;
+				GCC_WARN_ABOUT_RETURN_TYPE = YES;
+				GCC_WARN_UNDECLARED_SELECTOR = YES;
+				GCC_WARN_UNINITIALIZED_AUTOS = YES;
+				GCC_WARN_UNUSED_FUNCTION = YES;
+				GCC_WARN_UNUSED_VARIABLE = YES;
+				SWIFT_OPTIMIZATION_LEVEL = "-Owholemodule";
 			};
 			name = Release;
 		};
@@ -338,7 +375,7 @@
 				CLANG_WARN_OBJC_ROOT_CLASS = YES_ERROR;
 				CLANG_WARN_UNREACHABLE_CODE = YES;
 				CLANG_WARN__DUPLICATE_METHOD_MATCH = YES;
-				"CODE_SIGN_IDENTITY[sdk=iphoneos*]" = "iPhone Developer";
+				"CODE_SIGN_IDENTITY[sdk=iphoneos*]" = "";
 				COPY_PHASE_STRIP = NO;
 				CURRENT_PROJECT_VERSION = 1;
 				DEBUG_INFORMATION_FORMAT = dwarf;
@@ -373,6 +410,7 @@
 				SDKROOT = iphoneos;
 				SKIP_INSTALL = YES;
 				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
+				SWIFT_VERSION = 3.0;
 				TARGETED_DEVICE_FAMILY = "1,2";
 				VERSIONING_SYSTEM = "apple-generic";
 				VERSION_INFO_PREFIX = "";
@@ -396,7 +434,7 @@
 				CLANG_WARN_OBJC_ROOT_CLASS = YES_ERROR;
 				CLANG_WARN_UNREACHABLE_CODE = YES;
 				CLANG_WARN__DUPLICATE_METHOD_MATCH = YES;
-				"CODE_SIGN_IDENTITY[sdk=iphoneos*]" = "iPhone Developer";
+				"CODE_SIGN_IDENTITY[sdk=iphoneos*]" = "";
 				COPY_PHASE_STRIP = NO;
 				CURRENT_PROJECT_VERSION = 1;
 				DEBUG_INFORMATION_FORMAT = "dwarf-with-dsym";
@@ -423,6 +461,7 @@
 				PRODUCT_NAME = CacheCreek;
 				SDKROOT = iphoneos;
 				SKIP_INSTALL = YES;
+				SWIFT_VERSION = 3.0;
 				TARGETED_DEVICE_FAMILY = "1,2";
 				VALIDATE_PRODUCT = YES;
 				VERSIONING_SYSTEM = "apple-generic";
@@ -447,6 +486,7 @@
 				CLANG_WARN_OBJC_ROOT_CLASS = YES_ERROR;
 				CLANG_WARN_UNREACHABLE_CODE = YES;
 				CLANG_WARN__DUPLICATE_METHOD_MATCH = YES;
+				"CODE_SIGN_IDENTITY[sdk=appletvos*]" = "";
 				COPY_PHASE_STRIP = NO;
 				CURRENT_PROJECT_VERSION = 1;
 				DEBUG_INFORMATION_FORMAT = dwarf;
@@ -504,6 +544,7 @@
 				CLANG_WARN_OBJC_ROOT_CLASS = YES_ERROR;
 				CLANG_WARN_UNREACHABLE_CODE = YES;
 				CLANG_WARN__DUPLICATE_METHOD_MATCH = YES;
+				"CODE_SIGN_IDENTITY[sdk=appletvos*]" = "";
 				COPY_PHASE_STRIP = NO;
 				CURRENT_PROJECT_VERSION = 1;
 				DEBUG_INFORMATION_FORMAT = "dwarf-with-dsym";
@@ -582,6 +623,7 @@
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SDKROOT = iphoneos;
 				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
+				SWIFT_VERSION = 3.0;
 			};
 			name = Debug;
 		};
@@ -622,6 +664,7 @@
 				PRODUCT_BUNDLE_IDENTIFIER = com.nuudles.CacheCreekTests;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SDKROOT = iphoneos;
+				SWIFT_VERSION = 3.0;
 				VALIDATE_PRODUCT = YES;
 			};
 			name = Release;

CacheCreek.xcodeproj/xcshareddata/xcschemes/CacheCreek-iOS.xcscheme

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <Scheme
-   LastUpgradeVersion = "0730"
+   LastUpgradeVersion = "0800"
    version = "1.3">
    <BuildAction
       parallelizeBuildables = "YES"

CacheCreek.xcodeproj/xcshareddata/xcschemes/CacheCreek-tvOS.xcscheme

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <Scheme
-   LastUpgradeVersion = "0730"
+   LastUpgradeVersion = "0800"
    version = "1.3">
    <BuildAction
       parallelizeBuildables = "YES"

CacheCreekTests/LRUCacheTests.swift

@@ -54,41 +54,41 @@ class CacheCreekTests: XCTestCase {
 
         let floatKey: Float = 123.456
         cache.set(item: 123.456, forKey: floatKey)
-        XCTAssert(cache.item(forKey: floatKey) as Double? == .Some(123.456))
+        XCTAssert(cache.item(forKey: floatKey) as Double? == .some(123.456))
 
         cache[floatKey] = 456.789
         XCTAssert(cache.count == 1)
-        XCTAssert(cache[floatKey] as? Double == .Some(456.789))
+        XCTAssert(cache[floatKey] as? Double == .some(456.789))
 
         cache.set(item: "123.456", forKey: "123.456")
         XCTAssert(cache.count == 2)
-        XCTAssert(cache.item(forKey: "123.456") as String? == .Some("123.456"))
+        XCTAssert(cache.item(forKey: "123.456") as String? == .some("123.456"))
 
         let boolKey = true
         cache.set(item: true, forKey: boolKey)
         XCTAssert(cache.count == 3)
-        XCTAssert(cache.item(forKey: boolKey) as Bool? == .Some(true))
+        XCTAssert(cache.item(forKey: boolKey) as Bool? == .some(true))
 
         cache.removeItem(forKey: boolKey)
         XCTAssert(cache.count == 2)
-        XCTAssert(cache.item(forKey: boolKey) as Bool? == .None)
+        XCTAssert(cache.item(forKey: boolKey) as Bool? == .none)
     }
 
     func testSettingAndGettingEnum() {
         let cache = LRUCache()
-        cache["ABC"] = TestEnum.ABC
-        cache["DEF"] = TestEnum.DEF("BlahBlahBlah")
-        cache["GHI"] = TestEnum.GHI(-500)
+        cache["ABC"] = TestEnum.abc
+        cache["DEF"] = TestEnum.def("BlahBlahBlah")
+        cache["GHI"] = TestEnum.ghi(-500)
 
         guard let abc: TestEnum = cache.item(forKey: "ABC"),
-            def: TestEnum = cache.item(forKey: "DEF"),
-            ghi: TestEnum = cache.item(forKey: "GHI")
+            let def: TestEnum = cache.item(forKey: "DEF"),
+            let ghi: TestEnum = cache.item(forKey: "GHI")
             else {
                 XCTFail()
                 return
             }
         switch (abc, def, ghi) {
-        case (.ABC, .DEF(let stringValue), .GHI(let intValue)):
+        case (.abc, .def(let stringValue), .ghi(let intValue)):
             XCTAssert(stringValue == "BlahBlahBlah")
             XCTAssert(intValue == -500)
         default:
@@ -101,30 +101,30 @@ class CacheCreekTests: XCTestCase {
 
         // Int subscript
         cache[123] = 123
-        XCTAssert(cache[123] as? Int == .Some(123))
+        XCTAssert(cache[123] as? Int == .some(123))
         XCTAssert(cache.count == 1)
 
         cache[123] = nil
-        XCTAssert(cache[123] as? Int == .None)
+        XCTAssert(cache[123] as? Int == .none)
         XCTAssert(cache.count == 0)
 
         // String subscript
         cache["123"] = 123
-        XCTAssert(cache["123"] as? Int == .Some(123))
+        XCTAssert(cache["123"] as? Int == .some(123))
         XCTAssert(cache.count == 1)
 
         cache["123"] = nil
-        XCTAssert(cache["123"] as? Int == .None)
+        XCTAssert(cache["123"] as? Int == .none)
         XCTAssert(cache.count == 0)
 
         // Float subscript
         let floatKey: Float = 3.14
         cache[floatKey] = 123
-        XCTAssert(cache[floatKey] as? Int == .Some(123))
+        XCTAssert(cache[floatKey] as? Int == .some(123))
         XCTAssert(cache.count == 1)
         
         cache[floatKey] = nil
-        XCTAssert(cache[floatKey] as? Int == .None)
+        XCTAssert(cache[floatKey] as? Int == .none)
         XCTAssert(cache.count == 0)
     }
 
@@ -158,7 +158,7 @@ class CacheCreekTests: XCTestCase {
 
         XCTAssert(cache.count == 4)
 
-        NSNotificationCenter.defaultCenter().postNotificationName(UIApplicationDidReceiveMemoryWarningNotification, object: UIApplication.sharedApplication())
+        NotificationCenter.default.post(name: NSNotification.Name.UIApplicationDidReceiveMemoryWarning, object: UIApplication.shared)
 
         XCTAssert(cache.count == 0)
 
@@ -169,7 +169,7 @@ class CacheCreekTests: XCTestCase {
 
         XCTAssert(cache.count == 4)
 
-        NSNotificationCenter.defaultCenter().postNotificationName(UIApplicationDidEnterBackgroundNotification, object: UIApplication.sharedApplication())
+        NotificationCenter.default.post(name: NSNotification.Name.UIApplicationDidEnterBackground, object: UIApplication.shared)
 
         XCTAssert(cache.count == 0)
 
@@ -238,13 +238,14 @@ class CacheCreekTests: XCTestCase {
     func testObjCObjects() {
         let cache = LRUCache()
 
-        let oldCache = NSCache()
-        cache.set(item: oldCache, forKey: "InceptionCache")
+        let boxedInt = NSNumber(value: 42)
+        cache.set(item: boxedInt, forKey: "Answer")
 
-        guard let _: NSCache = cache.item(forKey: "InceptionCache") else {
-            XCTFail("Expected an NSCache object")
+        guard let answer: NSNumber = cache.item(forKey: "Answer") else {
+            XCTFail("Expected an NSNumber object")
             return
         }
+        XCTAssert(answer.intValue == 42)
     }
 }
 
@@ -254,7 +255,7 @@ private struct TestStruct {
 }
 
 private enum TestEnum {
-    case ABC
-    case DEF(String)
-    case GHI(Int)
+    case abc
+    case def(String)
+    case ghi(Int)
 }

README.md

@@ -4,6 +4,8 @@
 
 `CacheCreek` provides an an LRU cache that allows you to store any item, including objects, pure Swift structs, enums (with associated values), etc. Simply put, it's designed to act like an `NSCache` for everything, including Swift variables.
 
+![Swift version 3.0](https://img.shields.io/badge/Swift-3.0-brightgreen.svg?style=flat)] ![version 0.2.0 on Carthage](https://img.shields.io/badge/Carthage-0.2.0-brightgreen.svg?style=flat) [![MIT License](https://img.shields.io/badge/License-MIT-blue.svg?style=flat)](https://sjs.mit-license.org)
+
 ## Features
 
 - Simply set, get, and remove items based on any key that is `Hashable`
@@ -19,28 +21,6 @@
 - tvOS 9.0+
 - Xcode 7+
 
-## Installation using CocoaPods
-
-[CocoaPods](http://cocoapods.org) is a dependency manager for Cocoa projects.
-
-Because `CacheCreek` is written in Swift, you must use frameworks.
-
-To integrate `CacheCreek` into your Xcode project using CocoaPods, specify it in your `Podfile`:
-
-```ruby
-source 'https://github.com/CocoaPods/Specs.git'
-platform :ios, '8.0'
-use_frameworks!
-
-pod 'CacheCreek'
-```
-
-Then, run the following command:
-
-```bash
-$ pod install
-```
-
 ## Installation using Carthage
 
 Add this to your `Cartfile`:
@@ -93,4 +73,6 @@ print("\(cache.count)") // shows a count of 2
 
 # License
 
-[MIT License](https://sjs.mit-license.org)
+Copyright (c) 2015 Christopher Luu [MIT License](https://github.com/nuudles/CacheIsKing/blob/f93527d8ccc3f88b2e0697e9fd78be28d40a3a26/LICENSE)
+
+Copyright © 2016 Sami Samhuri  [MIT License](https://sjs.mit-license.org)

Source/AnyKey.swift

@@ -14,11 +14,11 @@ import Foundation
 /// `AnyKey` is a simple struct that conforms to `Hashable` to allow any other `Hashable` key to be used in the cache dictionary
 struct AnyKey: Hashable {
     /// The underlying value
-    private let underlying: Any
+    fileprivate let underlying: Any
     /// The hashing function
-    private let hashValueFunc: () -> Int
+    fileprivate let hashValueFunc: () -> Int
     /// The equality function
-    private let equalityFunc: (Any) -> Bool
+    fileprivate let equalityFunc: (Any) -> Bool
 
     init<T: Hashable>(_ key: T) {
         underlying = key

Source/DoublyLinkedList.swift

@@ -9,17 +9,17 @@ struct DoublyLinkedList {
 
     typealias Node = DoublyLinkedListNode
 
-    private(set) var head: Node?
+    fileprivate(set) var head: Node?
 
-    private(set) var tail: Node?
+    fileprivate(set) var tail: Node?
 
-    private(set) var count = 0
+    fileprivate(set) var count = 0
 
     var isEmpty: Bool {
         return head == nil
     }
 
-    mutating func prepend(key key: AnyKey, value: Any) -> Node {
+    mutating func prepend(key: AnyKey, value: Any) -> Node {
         let node = Node(key: key, value: value)
         node.next = head
         head?.prev = node
@@ -31,7 +31,7 @@ struct DoublyLinkedList {
         return node
     }
 
-    mutating func append(key key: AnyKey, value: Any) -> Node {
+    mutating func append(key: AnyKey, value: Any) -> Node {
         let node = Node(key: key, value: value)
         node.prev = tail
         tail?.next = node
@@ -57,27 +57,24 @@ struct DoublyLinkedList {
         return nil
     }
 
-    mutating func remove(node node: Node) {
-        if let prev = node.prev {
-            prev.next = node.next
-        }
-        else {
+    mutating func remove(node: Node) {
+        if node === head {
             head = node.next
         }
-        if let next = node.next {
-            next.prev = node.prev
-        }
-        else {
+        if node === tail {
             tail = node.prev
         }
+
+        node.prev?.next = node.next
+        node.next?.prev = node.prev
         node.next = nil
         node.prev = nil
         count -= 1
     }
 
-    mutating func moveToHead(node node: Node) {
+    mutating func moveToHead(node: Node) {
         remove(node: node)
-        prepend(key: node.key, value: node.value)
+        let _ = prepend(key: node.key, value: node.value)
     }
 
 }

Source/LRUCache.swift

@@ -7,21 +7,21 @@
 //  Modified to use LRU eviction by Sami Samhuri on 2016-08-10.
 //
 
-import Foundation
+import UIKit
 
 /// `LRUCache` is an LRU cache that can hold anything, including Swift structs, enums, and values.
 /// It is designed to work similar to the `NSCache`, but with native Swift support.
 ///
-public class LRUCache {
+public final class LRUCache {
     // MARK: - Private variables
     /// An array of `NSNotificationCenter` observers that need to be removed upon deinitialization
-    private var notificationObservers: [NSObjectProtocol] = []
+    fileprivate var notificationObservers: [NSObjectProtocol] = []
 
     /// The list of cached items. Most recently used item at head, least recently used item at tail.
-    private var items: DoublyLinkedList = DoublyLinkedList()
+    fileprivate var items: DoublyLinkedList = DoublyLinkedList()
 
     /// Maps keys of cached items to nodes in the linked list.
-    private var keyToNodeMap: [AnyKey:DoublyLinkedListNode] = [:]
+    fileprivate var keyToNodeMap: [AnyKey:DoublyLinkedListNode] = [:]
 
     // MARK: - Public variables
     /// The number of items in the cache.
@@ -39,27 +39,27 @@ public class LRUCache {
 
     // MARK: - Initialization methods
     public init() {
-        let removalBlock = { [unowned self] (_: NSNotification) in
+        let removalBlock = { [unowned self] (_: Notification) in
             self.removeAllItems()
         }
 
-        var notificationObserver = NSNotificationCenter.defaultCenter()
-            .addObserverForName(UIApplicationDidReceiveMemoryWarningNotification,
-                object: UIApplication.sharedApplication(),
+        var notificationObserver = NotificationCenter.default
+            .addObserver(forName: NSNotification.Name.UIApplicationDidReceiveMemoryWarning,
+                object: UIApplication.shared,
                 queue: nil,
-                usingBlock: removalBlock)
+                using: removalBlock)
         notificationObservers.append(notificationObserver)
-        notificationObserver = NSNotificationCenter.defaultCenter()
-            .addObserverForName(UIApplicationDidEnterBackgroundNotification,
-                object: UIApplication.sharedApplication(),
+        notificationObserver = NotificationCenter.default
+            .addObserver(forName: NSNotification.Name.UIApplicationDidEnterBackground,
+                object: UIApplication.shared,
                 queue: nil,
-                usingBlock: removalBlock)
+                using: removalBlock)
         notificationObservers.append(notificationObserver)
     }
 
     deinit {
         notificationObservers.forEach {
-            NSNotificationCenter.defaultCenter().removeObserver($0)
+            NotificationCenter.default.removeObserver($0)
         }
     }
 
@@ -81,7 +81,7 @@ public class LRUCache {
     /// - parameter item: The item to be cached
     /// - parameter key: The key with which to cache the item
     ///
-    public func set<K: Hashable>(item item: Any, forKey key: K) {
+    public func set<K: Hashable>(item: Any, forKey key: K) {
         let key = AnyKey(key)
         if let existingNode = keyToNodeMap[key] {
             items.remove(node: existingNode)