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1 /* Interface for the Object class for Objective-C.
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145
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2 Copyright (C) 1993-2020 Free Software Foundation, Inc.
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111
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3
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4 This file is part of GCC.
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5
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6 GCC is free software; you can redistribute it and/or modify it
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7 under the terms of the GNU General Public License as published by the
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8 Free Software Foundation; either version 3, or (at your option) any
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9 later version.
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10
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11 GCC is distributed in the hope that it will be useful, but WITHOUT
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12 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
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14 License for more details.
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15
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16 Under Section 7 of GPL version 3, you are granted additional
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17 permissions described in the GCC Runtime Library Exception, version
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18 3.1, as published by the Free Software Foundation.
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19
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20 You should have received a copy of the GNU General Public License and
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21 a copy of the GCC Runtime Library Exception along with this program;
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22 see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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23 <http://www.gnu.org/licenses/>. */
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24
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25
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26 #ifndef __object_INCLUDE_GNU
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27 #define __object_INCLUDE_GNU
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28
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29 #include "objc.h"
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30
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31 #ifdef __cplusplus
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32 extern "C" {
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33 #endif
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34
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35 /* The Object class is a very minimal root class included with the
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36 runtime. It is used as superclass for the two classes included
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37 with the runtime, Protocol and NXConstantString.
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38
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39 Because Objective-C allows multiple root classes, you can define
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40 your own root class, different from Object.
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41
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42 In particular, a Foundation library (such as GNUstep Base) is
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43 expected to provide its own root class (typically called NSObject),
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44 fully integrated with the library's own high-level features. It is
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45 expected that you should always use and interact with NSObject, and
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46 mostly ignore Object. */
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47
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48 /* All classes are derived from Object. As such, this is the overhead
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49 tacked onto those objects. */
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50 @interface Object
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51 {
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52 Class isa; /* A pointer to the instance's class structure. */
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53 }
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54 - (Class)class;
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55 - (BOOL)isEqual: (id)anObject;
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56 @end
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57
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58 #ifdef __cplusplus
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59 }
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60 #endif
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61
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62 #endif
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