stdckdint.h

#ifndef RBIMPL_STDCKDINT_H                           /*-*-C++-*-vi:se ft=cpp:*/
#define RBIMPL_STDCKDINT_H
#include "ruby/internal/config.h"
#include "ruby/internal/cast.h"
#include "ruby/internal/has/builtin.h"
#include "ruby/internal/stdbool.h"
 
#ifdef __has_include
# if __has_include(<stdckdint.h>)
#  /* Conforming C23 situation; e.g. recent clang */
#  define RBIMPL_HAVE_STDCKDINT_H
# endif
#endif
 
#ifdef HAVE_STDCKDINT_H
# /* Some OSes (most notably FreeBSD) have this file. */
# define RBIMPL_HAVE_STDCKDINT_H
#endif
 
#ifdef __cplusplus
# /* It seems OS/Compiler provided stdckdint.h tend not support C++ yet.
#  * Situations could improve someday but in a meantime let us work around.
#  */
# undef RBIMPL_HAVE_STDCKDINT_H
#endif
 
#ifdef RBIMPL_HAVE_STDCKDINT_H
# /* Take that. */
# include <stdckdint.h>
 
#elif RBIMPL_HAS_BUILTIN(__builtin_add_overflow)
# define ckd_add(x, y, z) RBIMPL_CAST((bool)__builtin_add_overflow((y), (z), (x)))
# define ckd_sub(x, y, z) RBIMPL_CAST((bool)__builtin_sub_overflow((y), (z), (x)))
# define ckd_mul(x, y, z) RBIMPL_CAST((bool)__builtin_mul_overflow((y), (z), (x)))
# define __STDC_VERSION_STDCKDINT_H__ 202311L
 
#/* elif defined(__cplusplus) */
#/* :TODO: if we assume C++11 we can use `<type_traits>` to implement them. */
 
#else
# /* intentionally leave them undefined */
# /* to make `#ifdef ckd_add` etc. work as intended. */
# undef ckd_add
# undef ckd_sub
# undef ckd_mul
# undef __STDC_VERSION_STDCKDINT_H__
#endif
 
#endif /* RBIMPL_STDCKDINT_H */