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91 lines
3.5 KiB
C
91 lines
3.5 KiB
C
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/** \noop-*-C++-*-vi:ft=cpp
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* @file
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* @author Ruby developers <ruby-core@ruby-lang.org>
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* @copyright This file is a part of the programming language Ruby.
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* Permission is hereby granted, to either redistribute and/or
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* modify this file, provided that the conditions mentioned in the
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* file COPYING are met. Consult the file for details.
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* @warning Symbols prefixed with either `RUBY3` or `ruby3` are
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* implementation details. Don't take them as canon. They could
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* rapidly appear then vanish. The name (path) of this header file
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* is also an implementation detail. Do not expect it to persist
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* at the place it is now. Developers are free to move it anywhere
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* anytime at will.
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* @note To ruby-core: remember that this header can be possibly
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* recursively included from extension libraries written in C++.
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* Do not expect for instance `__VA_ARGS__` is always available.
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* We assume C99 for ruby itself but we don't assume languages of
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* extension libraries. They could be written in C++98.
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* @brief #RUBY3_ATTR_CONSTEXPR.
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*/
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#include "ruby/3/has/feature.h"
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#include "ruby/3/compiler_is.h"
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/** @cond INTERNAL_MACRO*/
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#if defined(RUBY3_ATTR_CONSTEXPR)
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# /* Take that. */
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#elif ! defined(__cplusplus)
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# /* Makes no sense. */
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# define RUBY3_HAS_ATTR_CONSTEXPR_CXX11 0
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# define RUBY3_HAS_ATTR_CONSTEXPR_CXX14 0
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#elif defined(__cpp_constexpr)
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# /* https://isocpp.org/std/standing-documents/sd-6-sg10-feature-test-recommendations */
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# define RUBY3_HAS_ATTR_CONSTEXPR_CXX11 (__cpp_constexpr >= 200704L)
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# define RUBY3_HAS_ATTR_CONSTEXPR_CXX14 (__cpp_constexpr >= 201304L)
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#elif RUBY3_COMPILER_SINCE(MSVC, 19, 0, 0)
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# define RUBY3_HAS_ATTR_CONSTEXPR_CXX11 RUBY3_COMPILER_SINCE(MSVC, 19, 00, 00)
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# define RUBY3_HAS_ATTR_CONSTEXPR_CXX14 RUBY3_COMPILER_SINCE(MSVC, 19, 11, 00)
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#elif RUBY3_COMPILER_SINCE(SunPro, 5, 13, 0)
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# define RUBY3_HAS_ATTR_CONSTEXPR_CXX11 (__cplusplus >= 201103L)
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# define RUBY3_HAS_ATTR_CONSTEXPR_CXX14 (__cplusplus >= 201402L)
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#elif RUBY3_COMPILER_SINCE(GCC, 4, 9, 0)
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# define RUBY3_HAS_ATTR_CONSTEXPR_CXX11 (__cplusplus >= 201103L)
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# define RUBY3_HAS_ATTR_CONSTEXPR_CXX14 (__cplusplus >= 201402L)
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#elif RUBY3_HAS_FEATURE(cxx_relaxed_constexpr)
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# define RUBY3_HAS_ATTR_CONSTEXPR_CXX11 1
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# define RUBY3_HAS_ATTR_CONSTEXPR_CXX14 1
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#elif RUBY3_HAS_FEATURE(cxx_constexpr)
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# define RUBY3_HAS_ATTR_CONSTEXPR_CXX11 1
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# define RUBY3_HAS_ATTR_CONSTEXPR_CXX14 0
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#else
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# /* :FIXME: icpc must have constexpr but don't know how to detect. */
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# define RUBY3_HAS_ATTR_CONSTEXPR_CXX11 0
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# define RUBY3_HAS_ATTR_CONSTEXPR_CXX14 0
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#endif
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/** @endcond */
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/** Wraps (or simulates) C++11 `constexpr`. */
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#if defined(RUBY3_ATTR_CONSTEXPR)
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# /* Take that. */
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#elif RUBY3_HAS_ATTR_CONSTEXPR_CXX14
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# define RUBY3_ATTR_CONSTEXPR(_) constexpr
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#elif RUBY3_HAS_ATTR_CONSTEXPR_CXX11
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# define RUBY3_ATTR_CONSTEXPR(_) RUBY3_TOKEN_PASTE(RUBY3_ATTR_CONSTEXPR_, _)
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# define RUBY3_ATTR_CONSTEXPR_CXX11 constexpr
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# define RUBY3_ATTR_CONSTEXPR_CXX14 /* void */
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#else
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# define RUBY3_ATTR_CONSTEXPR(_) /* void */
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#endif
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/** Enables #RUBY3_ATTR_CONSTEXPR iff. #RUBY_NDEBUG. */
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#if defined(RUBY3_ATTR_CONSTEXPR_ON_NDEBUG)
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# /* Take that. */
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#elif RUBY_NDEBUG
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# define RUBY3_ATTR_CONSTEXPR_ON_NDEBUG(_) RUBY3_ATTR_CONSTEXPR(_)
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#else
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# define RUBY3_ATTR_CONSTEXPR_ON_NDEBUG(_) /* void */
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#endif
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