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stdckdint.h
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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/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 */