1 /* Interface for the Object class for Objective-C. 2 Copyright (C) 1993, 1994, 1995, 2009, 2010 Free Software Foundation, Inc. 3 4 This file is part of GCC. 5 6 GCC is free software; you can redistribute it and/or modify it 7 under the terms of the GNU General Public License as published by the 8 Free Software Foundation; either version 3, or (at your option) any 9 later version. 10 11 GCC is distributed in the hope that it will be useful, but WITHOUT 12 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public 14 License for more details. 15 16 Under Section 7 of GPL version 3, you are granted additional 17 permissions described in the GCC Runtime Library Exception, version 18 3.1, as published by the Free Software Foundation. 19 20 You should have received a copy of the GNU General Public License and 21 a copy of the GCC Runtime Library Exception along with this program; 22 see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 23 <http://www.gnu.org/licenses/>. */ 24 25 26 #ifndef __object_INCLUDE_GNU 27 #define __object_INCLUDE_GNU 28 29 #include "objc.h" 30 31 #ifdef __cplusplus 32 extern "C" { 33 #endif 34 35 /* The Object class is a very minimal root class included with the 36 runtime. It is used as superclass for the two classes included 37 with the runtime, Protocol and NXConstantString. 38 39 Because Objective-C allows multiple root classes, you can define 40 your own root class, different from Object. 41 42 In particular, a Foundation library (such as GNUstep Base) is 43 expected to provide its own root class (typically called NSObject), 44 fully integrated with the library's own high-level features. It is 45 expected that you should always use and interact with NSObject, and 46 mostly ignore Object. */ 47 48 /* All classes are derived from Object. As such, this is the overhead 49 tacked onto those objects. */ 50 @interface Object 51 { 52 Class isa; /* A pointer to the instance's class structure. */ 53 } 54 - (Class)class; 55 - (BOOL)isEqual: (id)anObject; 56 @end 57 58 #ifdef __cplusplus 59 } 60 #endif 61 62 #endif 63