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//
// 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
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