14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
|
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
|
-
-
+
+
-
-
+
+
-
+
|
* file.
*/
#import "OFObject.h"
#import "OFSerialization.h"
#import "OFJSONRepresentation.h"
/**
* \brief A class for representing null values in collections.
/*!
* @brief A class for representing null values in collections.
*/
@interface OFNull: OFObject <OFCopying, OFSerialization, OFJSONRepresentation>
/**
* \brief Returns an OFNull singleton.
/*!
* @brief Returns an OFNull singleton.
*
* \return An OFNull singleton
* @return An OFNull singleton
*/
+ (OFNull*)null;
@end
|