| // |
| // GTMObjectSingleton.h |
| // Macro to implement a creation method for a singleton |
| // |
| // Copyright 2005-2008 Google Inc. |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); you may not |
| // use this file except in compliance with the License. You may obtain a copy |
| // of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, WITHOUT |
| // WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the |
| // License for the specific language governing permissions and limitations under |
| // the License. |
| // |
| |
| // |
| // This file has been kept around for compatibility with apps relying on its macro, |
| // but given how simple this is, there is not a compelling reason for any app to |
| // use this macro. |
| // |
| // For a reasonable discussion of Objective-C singletons, see |
| // http://eschatologist.net/blog/?p=178 |
| // |
| // Sample usage: |
| // |
| // GTMOBJECT_SINGLETON_BOILERPLATE(SomeUsefulManager, sharedSomeUsefulManager) |
| // (with no trailing semicolon) |
| // |
| |
| #include <AvailabilityMacros.h> |
| |
| #if (defined(__IPHONE_7_0) && (__IPHONE_OS_VERSION_MAX_ALLOWED >= __IPHONE_7_0)) \ |
| || (defined(MAC_OS_X_VERSION_10_9) && (MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_9)) |
| #error "GTMOBJECT_SINGLETON_BOILERPLATE is deprecated; change this in your sources to a class method using dispatch_once." |
| #endif |
| |
| #if NS_BLOCKS_AVAILABLE |
| |
| #define GTMOBJECT_SINGLETON_BOILERPLATE(_object_name_, _shared_obj_name_) \ |
| + (_object_name_ *)_shared_obj_name_ { \ |
| static _object_name_ *obj; \ |
| static dispatch_once_t onceToken; \ |
| dispatch_once(&onceToken, ^{ \ |
| obj = [[self alloc] init]; \ |
| }); \ |
| return obj; \ |
| } |
| |
| #else |
| |
| #define GTMOBJECT_SINGLETON_BOILERPLATE(_object_name_, _shared_obj_name_) \ |
| + (_object_name_ *)_shared_obj_name_ { \ |
| static _object_name_ *obj; \ |
| if (obj == nil) { \ |
| obj = [[self alloc] init]; \ |
| } \ |
| return obj; \ |
| } |
| |
| #endif // NS_BLOCKS_AVAILABLE |
