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author | 卜部昌平 <shyouhei@ruby-lang.org> | 2020-05-08 18:10:13 +0900 |
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committer | 卜部昌平 <shyouhei@ruby-lang.org> | 2020-05-11 09:24:08 +0900 |
commit | b85fd1d690b65efaa126cf9c24da73f31eee7a4e (patch) | |
tree | e9bb5dbc7cea460fa8f209308c798eb783a33167 /include/ruby/internal/attr/constexpr.h | |
parent | 0d88fe3a7278e3dab2675c1fe2c0f184d0624da2 (diff) | |
download | ruby-b85fd1d690b65efaa126cf9c24da73f31eee7a4e.tar.gz |
mv include/ruby/{impl,internal}
Devs do not love "impl".
Diffstat (limited to 'include/ruby/internal/attr/constexpr.h')
-rw-r--r-- | include/ruby/internal/attr/constexpr.h | 85 |
1 files changed, 85 insertions, 0 deletions
diff --git a/include/ruby/internal/attr/constexpr.h b/include/ruby/internal/attr/constexpr.h new file mode 100644 index 0000000000..4b6cc81e3b --- /dev/null +++ b/include/ruby/internal/attr/constexpr.h @@ -0,0 +1,85 @@ +#ifndef RBIMPL_ATTR_CONSTEXPR_H /*-*-C++-*-vi:se ft=cpp:*/ +#define RBIMPL_ATTR_CONSTEXPR_H +/** + * @file + * @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 #RBIMPL_ATTR_CONSTEXPR. + */ +#include "ruby/impl/has/feature.h" +#include "ruby/impl/compiler_is.h" +#include "ruby/impl/token_paste.h" + +/** @cond INTERNAL_MACRO */ +#if ! defined(__cplusplus) +# /* Makes no sense. */ +# define RBIMPL_HAS_ATTR_CONSTEXPR_CXX11 0 +# define RBIMPL_HAS_ATTR_CONSTEXPR_CXX14 0 + +#elif defined(__cpp_constexpr) +# /* https://isocpp.org/std/standing-documents/sd-6-sg10-feature-test-recommendations */ +# define RBIMPL_HAS_ATTR_CONSTEXPR_CXX11 (__cpp_constexpr >= 200704L) +# define RBIMPL_HAS_ATTR_CONSTEXPR_CXX14 (__cpp_constexpr >= 201304L) + +#elif RBIMPL_COMPILER_SINCE(MSVC, 19, 0, 0) +# define RBIMPL_HAS_ATTR_CONSTEXPR_CXX11 RBIMPL_COMPILER_SINCE(MSVC, 19, 00, 00) +# define RBIMPL_HAS_ATTR_CONSTEXPR_CXX14 RBIMPL_COMPILER_SINCE(MSVC, 19, 11, 00) + +#elif RBIMPL_COMPILER_SINCE(SunPro, 5, 13, 0) +# define RBIMPL_HAS_ATTR_CONSTEXPR_CXX11 (__cplusplus >= 201103L) +# define RBIMPL_HAS_ATTR_CONSTEXPR_CXX14 (__cplusplus >= 201402L) + +#elif RBIMPL_COMPILER_SINCE(GCC, 4, 9, 0) +# define RBIMPL_HAS_ATTR_CONSTEXPR_CXX11 (__cplusplus >= 201103L) +# define RBIMPL_HAS_ATTR_CONSTEXPR_CXX14 (__cplusplus >= 201402L) + +#elif RBIMPL_HAS_FEATURE(cxx_relaxed_constexpr) +# define RBIMPL_HAS_ATTR_CONSTEXPR_CXX11 1 +# define RBIMPL_HAS_ATTR_CONSTEXPR_CXX14 1 + +#elif RBIMPL_HAS_FEATURE(cxx_constexpr) +# define RBIMPL_HAS_ATTR_CONSTEXPR_CXX11 1 +# define RBIMPL_HAS_ATTR_CONSTEXPR_CXX14 0 + +#else +# /* :FIXME: icpc must have constexpr but don't know how to detect. */ +# define RBIMPL_HAS_ATTR_CONSTEXPR_CXX11 0 +# define RBIMPL_HAS_ATTR_CONSTEXPR_CXX14 0 +#endif +/** @endcond */ + +/** Wraps (or simulates) C++11 `constexpr`. */ +#if RBIMPL_HAS_ATTR_CONSTEXPR_CXX14 +# define RBIMPL_ATTR_CONSTEXPR(_) constexpr + +#elif RBIMPL_HAS_ATTR_CONSTEXPR_CXX11 +# define RBIMPL_ATTR_CONSTEXPR(_) RBIMPL_TOKEN_PASTE(RBIMPL_ATTR_CONSTEXPR_, _) +# define RBIMPL_ATTR_CONSTEXPR_CXX11 constexpr +# define RBIMPL_ATTR_CONSTEXPR_CXX14 /* void */ + +#else +# define RBIMPL_ATTR_CONSTEXPR(_) /* void */ +#endif + +/** Enables #RBIMPL_ATTR_CONSTEXPR iff. #RUBY_NDEBUG. */ +#if RUBY_NDEBUG +# define RBIMPL_ATTR_CONSTEXPR_ON_NDEBUG(_) RBIMPL_ATTR_CONSTEXPR(_) +#else +# define RBIMPL_ATTR_CONSTEXPR_ON_NDEBUG(_) /* void */ +#endif + +#endif /* RBIMPL_ATTR_CONSTEXPR_H */ |