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CPNull.j
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1 /*
2  * CPNull.j
3  * Foundation
4  *
5  * Created by Francisco Tolmasky.
6  * Copyright 2008, 280 North, Inc.
7  *
8  * This library is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU Lesser General Public
10  * License as published by the Free Software Foundation; either
11  * version 2.1 of the License, or (at your option) any later version.
12  *
13  * This library is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16  * Lesser General Public License for more details.
17  *
18  * You should have received a copy of the GNU Lesser General Public
19  * License along with this library; if not, write to the Free Software
20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21  */
22 
23 
24 var CPNullSharedNull = nil;
25 
34 @implementation CPNull : CPObject
35 {
36  id __doxygen__;
37 }
38 
39 /*+ (id)alloc
40 {
41  if (CPNullSharedNull)
42  return CPNullSharedNull;
43 
44  return [super alloc];
45 }*/
46 
52 + (CPNull)null
53 {
54  if (!CPNullSharedNull)
55  CPNullSharedNull = [[CPNull alloc] init];
56 
57  return CPNullSharedNull;
58 }
59 
60 - (BOOL)isEqual:(id)anObject
61 {
62  if (self === anObject)
63  return YES;
64 
65  return [anObject isKindOfClass:[CPNull class]];
66 }
67 
73 - (id)initWithCoder:(CPCoder)aCoder
74 {
75  return [CPNull null];
76 }
77 
83 - (void)encodeWithCoder:(CPCoder)aCoder
84 {
85 }
86 
87 @end