boolean.h

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#ifndef CLIBS_BOOLEAN_H
#define CLIBS_BOOLEAN_H

#ifdef __cplusplus
    #ifndef _BOOL_IS_DEFINED
        typedef bool BOOL;
        #define FALSE  false
        #define TRUE   true
        #define _BOOL_IS_DEFINED
    #endif  /* BOOL */
#else
    #if __STDC_VERSION__ < 199901L
        #ifndef _BOOL_IS_DEFINED
            typedef unsigned char BOOL;
            #define FALSE  0
            #define TRUE   1
            #define _BOOL_IS_DEFINED
        #endif  /* BOOL */
    #else
        #ifndef _BOOL_IS_DEFINED
            #include <stdbool.h>
            typedef bool BOOL;
            #define FALSE  false
            #define TRUE   true
            #define _BOOL_IS_DEFINED
        #endif  /* BOOL */
    #endif  /* C89 */
#endif  /* __cplusplus */

#endif  /* CLIBS_BOOLEAN_H */