constexpr.h

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#ifndef RBIMPL_ATTR_CONSTEXPR_H                      /*-*-C++-*-vi:se ft=cpp:*/
#define RBIMPL_ATTR_CONSTEXPR_H
#include "ruby/internal/has/feature.h"
#include "ruby/internal/compiler_is.h"
 
#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
#if RBIMPL_HAS_ATTR_CONSTEXPR_CXX14
# define RBIMPL_ATTR_CONSTEXPR(_) constexpr
 
#elif RBIMPL_HAS_ATTR_CONSTEXPR_CXX11
# define RBIMPL_ATTR_CONSTEXPR(_) RBIMPL_ATTR_CONSTEXPR_ ## _
# define RBIMPL_ATTR_CONSTEXPR_CXX11 constexpr
# define RBIMPL_ATTR_CONSTEXPR_CXX14 /* void */
 
#else
# define RBIMPL_ATTR_CONSTEXPR(_) /* void */
#endif
 
#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 */