//
//  single.h
//  AIAnimationDemo
//
//  Created by 艾泽鑫 on 2016/10/12.
//  Copyright © 2016年 艾泽鑫. All rights reserved.
//

#ifndef single_h
#define single_h


#endif /* single_h */
// ## : 连接字符串和参数
#define singleton_h(name) + (instancetype)shared##name;

#if __has_feature(objc_arc) // ARC

#define singleton_m(name) \
static id _instance; \
+ (id)allocWithZone:(struct _NSZone *)zone \
{ \
static dispatch_once_t onceToken; \
dispatch_once(&onceToken, ^{ \
_instance = [super allocWithZone:zone]; \
}); \
return _instance; \
} \
\
+ (instancetype)shared##name \
{ \
static dispatch_once_t onceToken; \
dispatch_once(&onceToken, ^{ \
_instance = [[self alloc] init]; \
});\
return _instance; \
} \
+ (id)copyWithZone:(struct _NSZone *)zone \
{ \
    return _instance; \
}

#else // 非ARC

#define singleton_m(name) \
static id _instance; \
+ (id)allocWithZone:(struct _NSZone *)zone \
{ \
static dispatch_once_t onceToken; \
dispatch_once(&onceToken, ^{ \
_instance = [super allocWithZone:zone]; \
}); \
return _instance; \
} \
\
+ (instancetype)shared##name \
{ \
static dispatch_once_t onceToken; \
dispatch_once(&onceToken, ^{ \
_instance = [[self alloc] init]; \
}); \
return _instance; \
} \
\
- (oneway void)release \
{ \
\
} \
\
- (id)autorelease \
{ \
return _instance; \
} \
\
- (id)retain \
{ \
return _instance; \
} \
\
- (NSUInteger)retainCount \
{ \
return 1; \
} \
\
+ (id)copyWithZone:(struct _NSZone *)zone \
{ \
return _instance; \
}

#endif



#define SYNTHESIZE_SINGLETON_FOR_CLASS(classname) \
\
static classname *shared##classname = nil; \
\
+ (classname *)shared##classname \
{ \
@synchronized(self) \
{ \
if (shared##classname == nil) \
{ \
shared##classname = [[self alloc] init]; \
} \
} \
\
return shared##classname; \
} \
\
+ (id)allocWithZone:(NSZone *)zone \
{ \
@synchronized(self) \
{ \
if (shared##classname == nil) \
{ \
shared##classname = [super allocWithZone:zone]; \
return shared##classname; \
} \
} \
\
return nil; \
} \
\
- (id)copyWithZone:(NSZone *)zone \
{ \
return self; \
}


