1 /* 2 * Copyright (c) 2000 Apple Computer, Inc. All rights reserved. 3 * 4 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ 5 * 6 * This file contains Original Code and/or Modifications of Original Code 7 * as defined in and that are subject to the Apple Public Source License 8 * Version 2.0 (the 'License'). You may not use this file except in 9 * compliance with the License. The rights granted to you under the License 10 * may not be used to create, or enable the creation or redistribution of, 11 * unlawful or unlicensed copies of an Apple operating system, or to 12 * circumvent, violate, or enable the circumvention or violation of, any 13 * terms of an Apple operating system software license agreement. 14 * 15 * Please obtain a copy of the License at 16 * http://www.opensource.apple.com/apsl/ and read it before using this file. 17 * 18 * The Original Code and all software distributed under the License are 19 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER 20 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, 21 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, 22 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. 23 * Please see the License for the specific language governing rights and 24 * limitations under the License. 25 * 26 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ 27 */ 28 /* OSBoolean.cpp created by rsulack on Tue Oct 12 1999 */ 29 30 #include <libkern/c++/OSBoolean.h> 31 #include <libkern/c++/OSString.h> 32 #include <libkern/c++/OSSerialize.h> 33 #include <libkern/c++/OSLib.h> 34 35 #define super OSObject 36 37 OSDefineMetaClassAndStructorsWithInit(OSBoolean, OSObject, OSBoolean::initialize()) 38 OSMetaClassDefineReservedUnused(OSBoolean, 0); 39 OSMetaClassDefineReservedUnused(OSBoolean, 1); 40 OSMetaClassDefineReservedUnused(OSBoolean, 2); 41 OSMetaClassDefineReservedUnused(OSBoolean, 3); 42 OSMetaClassDefineReservedUnused(OSBoolean, 4); 43 OSMetaClassDefineReservedUnused(OSBoolean, 5); 44 OSMetaClassDefineReservedUnused(OSBoolean, 6); 45 OSMetaClassDefineReservedUnused(OSBoolean, 7); 46 47 static OSBoolean * gOSBooleanTrue = 0; 48 static OSBoolean * gOSBooleanFalse = 0; 49 50 OSBoolean * const & kOSBooleanTrue = gOSBooleanTrue; 51 OSBoolean * const & kOSBooleanFalse = gOSBooleanFalse; 52 53 void OSBoolean::initialize() 54 { 55 gOSBooleanTrue = new OSBoolean; 56 assert(gOSBooleanTrue); 57 58 if (!gOSBooleanTrue->init()) { 59 gOSBooleanTrue->OSObject::free(); 60 assert(false); 61 }; 62 gOSBooleanTrue->value = true; 63 64 gOSBooleanFalse = new OSBoolean; 65 assert(gOSBooleanFalse); 66 67 if (!gOSBooleanFalse->init()) { 68 gOSBooleanFalse->OSObject::free(); 69 assert(false); 70 }; 71 gOSBooleanFalse->value = false; 72 } 73 74 void OSBoolean::free() 75 { 76 /* 77 * An OSBoolean should never have free() called on it, since it is a shared 78 * object, with two non-mutable instances: kOSBooleanTrue, kOSBooleanFalse. 79 * There will be cases where an incorrect number of releases will cause the 80 * free() method to be called, however, which we must catch and ignore here. 81 */ 82 assert(false); 83 } 84 85 void OSBoolean::taggedRetain(__unused const void *tag) const { } 86 void OSBoolean::taggedRelease(__unused const void *tag, __unused const int when) const { } 87 88 OSBoolean *OSBoolean::withBoolean(bool inValue) 89 { 90 return (inValue) ? kOSBooleanTrue : kOSBooleanFalse; 91 } 92 93 bool OSBoolean::isTrue() const { return value; } 94 bool OSBoolean::isFalse() const { return !value; } 95 bool OSBoolean::getValue() const { return value; } 96 97 bool OSBoolean::isEqualTo(const OSBoolean *boolean) const 98 { 99 return (boolean == this); 100 } 101 102 bool OSBoolean::isEqualTo(const OSMetaClassBase *obj) const 103 { 104 OSBoolean * boolean; 105 if ((boolean = OSDynamicCast(OSBoolean, obj))) 106 return isEqualTo(boolean); 107 else 108 return false; 109 } 110 111 bool OSBoolean::serialize(OSSerialize *s) const 112 { 113 return s->addString(value ? "<true/>" : "<false/>"); 114 } 115