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comparison: ipc/chromium/src/base/singleton_objc.h
ipc/chromium/src/base/singleton_objc.h
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| 1 // Copyright (c) 2008 The Chromium Authors. All rights reserved. | |
| 2 // Use of this source code is governed by a BSD-style license that can be | |
| 3 // found in the LICENSE file. | |
| 4 | |
| 5 // Support for using the Singleton<T> pattern with Objective-C objects. A | |
| 6 // SingletonObjC is the same as a Singleton, except the default traits are | |
| 7 // appropriate for Objective-C objects. A typical Objective-C object of type | |
| 8 // NSExampleType can be maintained as a singleton and accessed with: | |
| 9 // | |
| 10 // NSExampleType* exampleSingleton = SingletonObjC<NSExampleType>::get(); | |
| 11 // | |
| 12 // The first time this is used, it will create exampleSingleton as the result | |
| 13 // of [[NSExampleType alloc] init]. Subsequent calls will return the same | |
| 14 // NSExampleType* object. The object will be released by calling | |
| 15 // -[NSExampleType release] when Singleton's atexit routines run | |
| 16 // (see singleton.h). | |
| 17 // | |
| 18 // For Objective-C objects initialized through means other than the | |
| 19 // no-parameter -init selector, DefaultSingletonObjCTraits may be extended | |
| 20 // as needed: | |
| 21 // | |
| 22 // struct FooSingletonTraits : public DefaultSingletonObjCTraits<Foo> { | |
| 23 // static Foo* New() { | |
| 24 // return [[Foo alloc] initWithName:@"selecty"]; | |
| 25 // } | |
| 26 // } | |
| 27 // ... | |
| 28 // Foo* widgetSingleton = SingletonObjC<Foo, FooSingletonTraits>::get(); | |
| 29 | |
| 30 #ifndef BASE_SINGLETON_OBJC_H_ | |
| 31 #define BASE_SINGLETON_OBJC_H_ | |
| 32 | |
| 33 #import <Foundation/Foundation.h> | |
| 34 #include "base/singleton.h" | |
| 35 | |
| 36 // Singleton traits usable to manage traditional Objective-C objects, which | |
| 37 // are instantiated by sending |alloc| and |init| messages, and are deallocated | |
| 38 // in a memory-managed environment when their retain counts drop to 0 by | |
| 39 // sending |release| messages. | |
| 40 template<typename Type> | |
| 41 struct DefaultSingletonObjCTraits : public DefaultSingletonTraits<Type> { | |
| 42 static Type* New() { | |
| 43 return [[Type alloc] init]; | |
| 44 } | |
| 45 | |
| 46 static void Delete(Type* object) { | |
| 47 [object release]; | |
| 48 } | |
| 49 }; | |
| 50 | |
| 51 // Exactly like Singleton, but without the DefaultSingletonObjCTraits as the | |
| 52 // default trait class. This makes it straightforward for Objective-C++ code | |
| 53 // to hold Objective-C objects as singletons. | |
| 54 template<typename Type, | |
| 55 typename Traits = DefaultSingletonObjCTraits<Type>, | |
| 56 typename DifferentiatingType = Type> | |
| 57 class SingletonObjC : public Singleton<Type, Traits, DifferentiatingType> { | |
| 58 }; | |
| 59 | |
| 60 #endif // BASE_SINGLETON_OBJC_H_ |
