#ifndef RBIMPL_STDCKDINT_H /*-*-C++-*-vi:se ft=cpp:*/
#define RBIMPL_STDCKDINT_H
/**
* @author Ruby developers <ruby-core@ruby-lang.org>
* @copyright This file is a part of the programming language Ruby.
* Permission is hereby granted, to either redistribute and/or
* modify this file, provided that the conditions mentioned in the
* file COPYING are met. Consult the file for details.
* @warning Symbols prefixed with either `RBIMPL` or `rbimpl` are
* implementation details. Don't take them as canon. They could
* rapidly appear then vanish. The name (path) of this header file
* is also an implementation detail. Do not expect it to persist
* at the place it is now. Developers are free to move it anywhere
* anytime at will.
* @note To ruby-core: remember that this header can be possibly
* recursively included from extension libraries written in C++.
* Do not expect for instance `__VA_ARGS__` is always available.
* We assume C99 for ruby itself but we don't assume languages of
* extension libraries. They could be written in C++98.
* @brief C23 shim for <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 */
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