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#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/internal/has/feature.h" #include "ruby/internal/compiler_is.h" #include "ruby/internal/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_DEBUG. */ #if !RUBY_DEBUG # define RBIMPL_ATTR_CONSTEXPR_UNLESS_DEBUG(_) RBIMPL_ATTR_CONSTEXPR(_) #else # define RBIMPL_ATTR_CONSTEXPR_UNLESS_DEBUG(_) /* void */ #endif #endif /* RBIMPL_ATTR_CONSTEXPR_H */