bool.h

#ifndef VNBOOL_H_INCLUDED
#define VNBOOL_H_INCLUDED

#include "vn/util/compiler.h"
#include "vn/int.h"

#if !defined(__cplusplus)

    #if VN_HAVE_STDBOOL_H
        #include <stdbool.h>
    #else
        #if !defined(__GNUC__)
            /* _Bool builtin type is included in GCC. */
            /* ISO C Standard: 5.2.5 An object declared as type _Bool is large
            * enough to store the values 0 and 1. */
            typedef int8_t _Bool;
        #endif

        /* ISO C Standard: 7.16 Boolean type */

        #if defined(__STDC__) && defined(__GNUC__)
            /* Avoid warning "ISO C90/89 does not support boolean types" */
            #define bool int8_t
        #else
            #define bool _Bool
        #endif

        #define true 1
        #define false 0
        #define __bool_true_false_are_defined 1
    #endif

#endif

#endif