66 lines
2.5 KiB
C++
66 lines
2.5 KiB
C++
// Copyright (c) 2016-2025 Antony Polukhin
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//
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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#ifndef BOOST_PFR_DETAIL_FOR_EACH_FIELD_HPP
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#define BOOST_PFR_DETAIL_FOR_EACH_FIELD_HPP
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#pragma once
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#include <boost/pfr/detail/config.hpp>
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#include <boost/pfr/detail/core.hpp>
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#include <boost/pfr/detail/fields_count.hpp>
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#include <boost/pfr/detail/for_each_field_impl.hpp>
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#include <boost/pfr/detail/make_integer_sequence.hpp>
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#if !defined(BOOST_PFR_INTERFACE_UNIT)
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#include <type_traits> // metaprogramming stuff
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#include <utility> // forward_like
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#endif
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namespace boost { namespace pfr { namespace detail {
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template <class T, class F>
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constexpr void for_each_field(T&& value, F&& func) {
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#if BOOST_PFR_USE_CPP26
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using no_ref = std::remove_reference_t<T>;
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if constexpr (std::is_aggregate_v<no_ref> || std::is_bounded_array_v<no_ref>) {
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auto &&[... members] = value;
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::boost::pfr::detail::for_each_field_impl(value,
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std::forward<F>(func),
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std::make_index_sequence<sizeof...(members)>{},
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std::is_rvalue_reference<T &&>{});
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} else {
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::boost::pfr::detail::for_each_field_impl(value,
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std::forward<F>(func),
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std::make_index_sequence<1>{},
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std::is_rvalue_reference<T &&>{});
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}
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#else
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constexpr std::size_t fields_count_val = boost::pfr::detail::fields_count<std::remove_reference_t<T>>();
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::boost::pfr::detail::for_each_field_dispatcher(
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value,
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[f = std::forward<F>(func)](auto&& t) mutable {
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// MSVC related workaround. Its lambdas do not capture constexprs.
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constexpr std::size_t fields_count_val_in_lambda
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= boost::pfr::detail::fields_count<std::remove_reference_t<T>>();
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::boost::pfr::detail::for_each_field_impl(
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t,
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std::forward<F>(f),
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detail::make_index_sequence<fields_count_val_in_lambda>{},
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std::is_rvalue_reference<T&&>{}
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);
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},
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detail::make_index_sequence<fields_count_val>{}
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);
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#endif
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}
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}}} // namespace boost::pfr::detail
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#endif // BOOST_PFR_DETAIL_FOR_EACH_FIELD_HPP
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