C Tips: stdbool.h

下面是来自 cprogramming.com 的 stdbool.h 的定义：

#ifndef STDBOOL_H_
#define STDBOOL_H_
 
/**
 * stdbool.h - ISO C99 Boolean type
 * Author    - Bill Chatfield
 * E-mail    - bill underscore chatfield at yahoo dot com
 * Copyright - You are free to use for any purpose except illegal acts
 * Warrenty  - None: don't blame me if it breaks something
 *
 * In ISO C99, stdbool.h is a standard header and _Bool is a keyword, but
 * some compilers don't offer these yet. This header file is an 
 * implementation of the standard ISO C99 stdbool.h header file. It checks
 * for various compiler versions and defines things that are missing in
 * those versions.
 *
 * The GNU and Watcom compilers include a stdbool.h, but the Borland
 * C/C++ 5.5.1 compiler and the Microsoft compilers do not.
 * 
 * See http://predef.sourceforge.net/precomp.html for compile macros.
 */
 
/**
 * Borland C++ 5.5.1 does not define _Bool.
 */
#ifdef __BORLANDC__
typedef int _Bool;
#endif
 
/**
 * Microsoft C/C++ version 14.00.50727.762, which comes with Visual C++ 2005,
 * and version 15.00.30729.01, which comes with Visual C++ 2008, do not 
 * define _Bool.
 */
#if defined(_MSC_VER) && _MSC_VER <= 1500
typedef int _Bool;
#endif
 
/**
 * Define the Boolean macros only if they are not already defined.
 */
#ifndef __bool_true_false_are_defined
#define bool _Bool
#define false 0 
#define true 1
#define __bool_true_false_are_defined 1
#endif
 
#endif /*STDBOOL_H_*/

但是上述文件在 Visual Studio 2012 中不工作。

下面是我自己写的 stdbool.h 的定义：

#ifndef STDBOOL_H_
#define STDBOOL_H_

/**
 * stdbool.h
 * Author    - Yaping Xin
 * E-mail    - xinyp at live dot com
 * Copyright - You are free to use for any purpose except illegal acts
 * Warrenty  - None: don't blame me if it breaks something
 *
 * In ISO C99, stdbool.h is a standard header and _Bool is a keyword, but
 * some compilers don't offer these yet. This header file is an 
 * implementation of the stdbool.h header file.
 *
 */

#ifndef _Bool
typedef unsigned char _Bool;
#endif /* _Bool */
 
/**
 * Define the Boolean macros only if they are not already defined.
 */
#ifndef __bool_true_false_are_defined
#define bool _Bool
#define false 0 
#define true 1
#define __bool_true_false_are_defined 1
#endif /* __bool_true_false_are_defined */
 
#endif /* STDBOOL_H_ */

参考链接：

• stdbool.h in Visual Studio C++ Express 2008 ( standard C code) http://cboard.cprogramming.com/c-programming/138189-stdbool-h-visual-studio-cplusplus-express-2008-standard-c-code.html
  
• Boolean data type http://en.wikipedia.org/wiki/Boolean_data_type#C99
  
• Where is stdbool.h? http://stackoverflow.com/questions/1656874/where-is-stdbool-h