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C23 is going to have this header. The industry is already moving towards accepting it; OSes and compilers started to implement theirs. Why not detect its presence and if any, prefer over other ways. See also: - https://www.open-std.org/jtc1/sc22/wg14/www/docs/n2683.pdf - https://reviews.freebsd.org/D41734 - https://reviews.llvm.org/D157331 - https://gcc.gnu.org/git/?p=gcc.git;a=commit;h=8441841a1b985d68245954af1ff023db121b0635
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#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/has/builtin.h" | ||
#include "ruby/internal/stdbool.h" | ||
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#ifdef __has_include | ||
# if __has_include(<stdckdint.h>) | ||
# /* Conforming C23 situation; e.g. recent clang */ | ||
# define RBIMPL_HAVE_STDCKDINT_H | ||
# endif | ||
#endif | ||
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#ifdef HAVE_STDCKDINT_H | ||
# /* Some OSes (most notably FreeBSD) have this file. */ | ||
# define RBIMPL_HAVE_STDCKDINT_H | ||
#endif | ||
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#ifdef RBIMPL_HAVE_STDCKDINT_H | ||
# /* Take that. */ | ||
# include <stdckdint.h> | ||
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#elif RBIMPL_HAS_BUILTIN(__builtin_add_overflow) | ||
# define ckd_add(x, y, z) ((bool)__builtin_add_overflow((y), (z), (x))) | ||
# define ckd_sub(x, y, z) ((bool)__builtin_sub_overflow((y), (z), (x))) | ||
# define ckd_mul(x, y, z) ((bool)__builtin_mul_overflow((y), (z), (x))) | ||
# define __STDC_VERSION_STDCKDINT_H__ 202311L | ||
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#/* elif defined(__cplusplus) */ | ||
#/* :TODO: if we assume C++11 we can use `<type_traits>` to implement them. */ | ||
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#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 | ||
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#endif /* RBIMPL_STDCKDINT_H */ |