May 01, 2002
The New C:
bool, Advice to C and C++ Programmers
Randy Meyers
True or False: The type bool behaves identically in C99 and C++. True or False: Your C89 bool hackery will survive unscathed under C99. Read and find out.
May 2002/The New C/Listing 1
/* An interim version of <stdbool.h> from C/C++ Users Journal
* May 2002. This file may be included from C90, C++, or C99
* (but C99 should come with its own version).
*/
/* If C++, do nothing since bool is built in */
#if !defined(__cplusplus)
# if !defined(__bool_true_false_are_defined)
# define __bool_true_false_are_defined 1
/* If this is C99 or later, use built-in bool */
# if __STDC_VERSION__ >= 199901L
# define bool _Bool
# else
/* Choose an unsigned type that can be used as a bitfield */
# define bool unsigned char
# endif
# define true 1
# define false 0
# endif
#endif /* !defined(__cplusplus) */
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