112 lines
3.9 KiB
C++
112 lines
3.9 KiB
C++
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#ifndef BOOST_DESCRIBE_ENUM_HPP_INCLUDED
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#define BOOST_DESCRIBE_ENUM_HPP_INCLUDED
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// Copyright 2020 Peter Dimov
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// Distributed under the Boost Software License, Version 1.0.
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// https://www.boost.org/LICENSE_1_0.txt
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#include <boost/describe/detail/config.hpp>
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#if !defined(BOOST_DESCRIBE_CXX14)
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#define BOOST_DESCRIBE_ENUM(E, ...)
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#define BOOST_DESCRIBE_NESTED_ENUM(E, ...)
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#else
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#include <boost/describe/detail/pp_for_each.hpp>
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#include <boost/describe/detail/list.hpp>
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#include <type_traits>
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namespace boost
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{
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namespace describe
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{
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namespace detail
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{
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template<class D> struct enum_descriptor
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{
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// can't use auto here because of the need to supply the definitions below
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static constexpr decltype(D::value()) value = D::value();
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static constexpr decltype(D::name()) name = D::name();
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};
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// GCC requires these definitions
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template<class D> constexpr decltype(D::value()) enum_descriptor<D>::value;
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template<class D> constexpr decltype(D::name()) enum_descriptor<D>::name;
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template<class... T> auto enum_descriptor_fn_impl( int, T... )
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{
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return list<enum_descriptor<T>...>();
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}
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#define BOOST_DESCRIBE_ENUM_BEGIN(E) \
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inline auto boost_enum_descriptor_fn( E** ) \
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{ return boost::describe::detail::enum_descriptor_fn_impl( 0
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#define BOOST_DESCRIBE_ENUM_ENTRY(E, e) , []{ struct _boost_desc { \
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static constexpr auto value() noexcept { return E::e; } \
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static constexpr auto name() noexcept { return #e; } }; return _boost_desc(); }()
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#define BOOST_DESCRIBE_ENUM_END(E) ); }
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} // namespace detail
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#if defined(_MSC_VER) && !defined(__clang__)
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#define BOOST_DESCRIBE_ENUM(E, ...) \
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namespace should_use_BOOST_DESCRIBE_NESTED_ENUM {} \
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static_assert(std::is_enum<E>::value, "BOOST_DESCRIBE_ENUM should only be used with enums"); \
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BOOST_DESCRIBE_ENUM_BEGIN(E) \
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BOOST_DESCRIBE_PP_FOR_EACH(BOOST_DESCRIBE_ENUM_ENTRY, E, __VA_ARGS__) \
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BOOST_DESCRIBE_ENUM_END(E)
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#define BOOST_DESCRIBE_NESTED_ENUM(E, ...) \
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static_assert(std::is_enum<E>::value, "BOOST_DESCRIBE_NESTED_ENUM should only be used with enums"); \
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friend BOOST_DESCRIBE_ENUM_BEGIN(E) \
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BOOST_DESCRIBE_PP_FOR_EACH(BOOST_DESCRIBE_ENUM_ENTRY, E, __VA_ARGS__) \
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BOOST_DESCRIBE_ENUM_END(E)
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#else
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#define BOOST_DESCRIBE_ENUM(E, ...) \
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namespace should_use_BOOST_DESCRIBE_NESTED_ENUM {} \
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static_assert(std::is_enum<E>::value, "BOOST_DESCRIBE_ENUM should only be used with enums"); \
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BOOST_DESCRIBE_MAYBE_UNUSED BOOST_DESCRIBE_ENUM_BEGIN(E) \
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BOOST_DESCRIBE_PP_FOR_EACH(BOOST_DESCRIBE_ENUM_ENTRY, E, ##__VA_ARGS__) \
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BOOST_DESCRIBE_ENUM_END(E)
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#define BOOST_DESCRIBE_NESTED_ENUM(E, ...) \
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static_assert(std::is_enum<E>::value, "BOOST_DESCRIBE_NESTED_ENUM should only be used with enums"); \
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BOOST_DESCRIBE_MAYBE_UNUSED friend BOOST_DESCRIBE_ENUM_BEGIN(E) \
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BOOST_DESCRIBE_PP_FOR_EACH(BOOST_DESCRIBE_ENUM_ENTRY, E, ##__VA_ARGS__) \
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BOOST_DESCRIBE_ENUM_END(E)
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#endif
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} // namespace describe
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} // namespace boost
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#endif // defined(BOOST_DESCRIBE_CXX14)
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#if defined(_MSC_VER) && !defined(__clang__)
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#define BOOST_DEFINE_ENUM(E, ...) enum E { __VA_ARGS__ }; BOOST_DESCRIBE_ENUM(E, __VA_ARGS__)
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#define BOOST_DEFINE_ENUM_CLASS(E, ...) enum class E { __VA_ARGS__ }; BOOST_DESCRIBE_ENUM(E, __VA_ARGS__)
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#define BOOST_DEFINE_FIXED_ENUM(E, Base, ...) enum E: Base { __VA_ARGS__ }; BOOST_DESCRIBE_ENUM(E, __VA_ARGS__)
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#define BOOST_DEFINE_FIXED_ENUM_CLASS(E, Base, ...) enum class E: Base { __VA_ARGS__ }; BOOST_DESCRIBE_ENUM(E, __VA_ARGS__)
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#else
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#define BOOST_DEFINE_ENUM(E, ...) enum E { __VA_ARGS__ }; BOOST_DESCRIBE_ENUM(E, ##__VA_ARGS__)
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#define BOOST_DEFINE_ENUM_CLASS(E, ...) enum class E { __VA_ARGS__ }; BOOST_DESCRIBE_ENUM(E, ##__VA_ARGS__)
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#define BOOST_DEFINE_FIXED_ENUM(E, Base, ...) enum E: Base { __VA_ARGS__ }; BOOST_DESCRIBE_ENUM(E, ##__VA_ARGS__)
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#define BOOST_DEFINE_FIXED_ENUM_CLASS(E, Base, ...) enum class E: Base { __VA_ARGS__ }; BOOST_DESCRIBE_ENUM(E, ##__VA_ARGS__)
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#endif
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#endif // #ifndef BOOST_DESCRIBE_ENUM_HPP_INCLUDED
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