1 /* 2 File: CABool.h 3 Abstract: Part of CoreAudio Utility Classes 4 Version: 1.1 5 6 Disclaimer: IMPORTANT: This Apple software is supplied to you by Apple 7 Inc. ("Apple") in consideration of your agreement to the following 8 terms, and your use, installation, modification or redistribution of 9 this Apple software constitutes acceptance of these terms. If you do 10 not agree with these terms, please do not use, install, modify or 11 redistribute this Apple software. 12 13 In consideration of your agreement to abide by the following terms, and 14 subject to these terms, Apple grants you a personal, non-exclusive 15 license, under Apple's copyrights in this original Apple software (the 16 "Apple Software"), to use, reproduce, modify and redistribute the Apple 17 Software, with or without modifications, in source and/or binary forms; 18 provided that if you redistribute the Apple Software in its entirety and 19 without modifications, you must retain this notice and the following 20 text and disclaimers in all such redistributions of the Apple Software. 21 Neither the name, trademarks, service marks or logos of Apple Inc. may 22 be used to endorse or promote products derived from the Apple Software 23 without specific prior written permission from Apple. Except as 24 expressly stated in this notice, no other rights or licenses, express or 25 implied, are granted by Apple herein, including but not limited to any 26 patent rights that may be infringed by your derivative works or by other 27 works in which the Apple Software may be incorporated. 28 29 The Apple Software is provided by Apple on an "AS IS" basis. APPLE 30 MAKES NO WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION 31 THE IMPLIED WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS 32 FOR A PARTICULAR PURPOSE, REGARDING THE APPLE SOFTWARE OR ITS USE AND 33 OPERATION ALONE OR IN COMBINATION WITH YOUR PRODUCTS. 34 35 IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL 36 OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 37 SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 38 INTERRUPTION) ARISING IN ANY WAY OUT OF THE USE, REPRODUCTION, 39 MODIFICATION AND/OR DISTRIBUTION OF THE APPLE SOFTWARE, HOWEVER CAUSED 40 AND WHETHER UNDER THEORY OF CONTRACT, TORT (INCLUDING NEGLIGENCE), 41 STRICT LIABILITY OR OTHERWISE, EVEN IF APPLE HAS BEEN ADVISED OF THE 42 POSSIBILITY OF SUCH DAMAGE. 43 44 Copyright (C) 2014 Apple Inc. All Rights Reserved. 45 46 */ 47 #if !defined(__CABool_h__) 48 #define __CABool_h__ 49 50 //============================================================================= 51 // Includes 52 //============================================================================= 53 54 // System Includes 55 #include "CADebugMacros.h" 56 #include "CAException.h" 57 58 //============================================================================= 59 // CABool 60 // 61 // This class implements a boolean value that has a third state that marks 62 // it as uninitialized. Accessing the value of an instance of this class that 63 // is uninitialized will throw an exception. 64 //============================================================================= 65 66 class CABool 67 { 68 69 // Construction/Destruction 70 public: CABool()71 CABool() : mValue(-1) {} CABool(bool inValue)72 CABool(bool inValue) : mValue(inValue ? 1 : 0) {} CABool(const CABool & inValue)73 CABool(const CABool& inValue) : mValue(inValue.mValue) {} ~CABool()74 ~CABool() {} 75 76 CABool& operator=(bool inValue) { mValue = inValue; return *this; } 77 CABool& operator=(const CABool& inValue) { mValue = inValue.mValue; return *this; } 78 79 operator bool() const { ThrowIf(mValue == -1, CAException('nope'), "CABool: uninitialized"); return mValue != 0; } IsInitialized()80 bool IsInitialized() const { return mValue != -1; } Uninitialize()81 void Uninitialize() { mValue = -1; } 82 83 private: 84 SInt32 mValue; 85 86 CABool(const void*); // prevent accidental instantiation with a pointer via bool constructor 87 }; 88 89 #endif 90