| 1 | // Copyright (c) 2022 Denis Mikhailov |
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| 2 | // |
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| 3 | // Distributed under the Boost Software License, Version 1.0. (See accompanying |
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| 4 | // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) |
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| 5 | |
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| 6 | #ifndef BOOST_PFR_DETAIL_POSSIBLE_REFLECTABLE_HPP |
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| 7 | #define BOOST_PFR_DETAIL_POSSIBLE_REFLECTABLE_HPP |
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| 8 | #pragma once |
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| 9 | |
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| 10 | #include <boost/pfr/detail/config.hpp> |
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| 11 | #include <boost/pfr/traits_fwd.hpp> |
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| 12 | |
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| 13 | #include <type_traits> // for std::is_aggregate |
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| 14 | |
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| 15 | namespace boost { namespace pfr { namespace detail { |
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| 16 | |
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| 17 | ///////////////////// Returns false when the type exactly wasn't be reflectable |
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| 18 | template <class T, class WhatFor> |
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| 19 | constexpr decltype(is_reflectable<T, WhatFor>::value) possible_reflectable(long) noexcept { |
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| 20 | return is_reflectable<T, WhatFor>::value; |
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| 21 | } |
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| 22 | |
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| 23 | #if BOOST_PFR_ENABLE_IMPLICIT_REFLECTION |
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| 24 | |
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| 25 | template <class T, class WhatFor> |
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| 26 | constexpr bool possible_reflectable(int) noexcept { |
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| 27 | # if defined(__cpp_lib_is_aggregate) |
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| 28 | using type = std::remove_cv_t<T>; |
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| 29 | return std::is_aggregate<type>(); |
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| 30 | # else |
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| 31 | return true; |
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| 32 | # endif |
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| 33 | } |
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| 34 | |
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| 35 | #else |
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| 36 | |
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| 37 | template <class T, class WhatFor> |
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| 38 | constexpr bool possible_reflectable(int) noexcept { |
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| 39 | // negative answer here won't change behaviour in PFR-dependent libraries(like Fusion) |
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| 40 | return false; |
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| 41 | } |
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| 42 | |
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| 43 | #endif |
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| 44 | |
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| 45 | }}} // namespace boost::pfr::detail |
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| 46 | |
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| 47 | #endif // BOOST_PFR_DETAIL_POSSIBLE_REFLECTABLE_HPP |
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| 48 | |
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| 49 | |
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| 50 | |
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