整理

2026-03-23 20:54:41 +08:00
commit e13b3650e9
4596 changed files with 1015768 additions and 0 deletions
--- a/include/boost/pfr/detail/for_each_field_impl.hpp
+++ b/include/boost/pfr/detail/for_each_field_impl.hpp
@@ -0,0 +1,89 @@
+// Copyright (c) 2016-2025 Antony Polukhin
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+
+#ifndef BOOST_PFR_DETAIL_FOR_EACH_FIELD_IMPL_HPP
+#define BOOST_PFR_DETAIL_FOR_EACH_FIELD_IMPL_HPP
+#pragma once
+
+#include <boost/pfr/detail/config.hpp>
+
+#include <boost/pfr/detail/sequence_tuple.hpp>
+#include <boost/pfr/detail/rvalue_t.hpp>
+
+#if !defined(BOOST_PFR_INTERFACE_UNIT)
+#include <utility>      // metaprogramming stuff
+#endif
+
+namespace boost { namespace pfr { namespace detail {
+
+template <std::size_t Index>
+using size_t_ = std::integral_constant<std::size_t, Index >;
+
+template <class T, class F, class I, class = decltype(std::declval<F>()(std::declval<T>(), I{}))>
+constexpr void for_each_field_impl_apply(T&& v, F&& f, I i, long) {
+    std::forward<F>(f)(std::forward<T>(v), i);
+}
+
+template <class T, class F, class I>
+constexpr void for_each_field_impl_apply(T&& v, F&& f, I /*i*/, int) {
+    std::forward<F>(f)(std::forward<T>(v));
+}
+
+#if BOOST_PFR_USE_CPP26
+template<class T, class F, std::size_t... I>
+constexpr void for_each_field_impl(T& t, F&& f, std::index_sequence<I...>, auto move_values) {
+    if constexpr (std::is_aggregate_v<T> || std::is_bounded_array_v<T>) {
+        auto &&[... members] = t;
+        if constexpr (move_values)
+            (detail::for_each_field_impl_apply(std::move(members...[I]),
+                                               std::forward<F>(f),
+                                               size_t_<I>{},
+                                               1L),
+             ...);
+        else
+            (detail::for_each_field_impl_apply(
+                 members... [I], std::forward<F>(f), size_t_<I> {}, 1L),
+             ...);
+    } else {
+        if constexpr (move_values)
+            (detail::for_each_field_impl_apply(std::move(t), std::forward<F>(f), size_t_<I>{}, 1L),
+             ...);
+        else
+            (detail::for_each_field_impl_apply(t, std::forward<F>(f), size_t_<I>{}, 1L), ...);
+    }
+}
+#elif !defined(__cpp_fold_expressions) || __cpp_fold_expressions < 201603
+template <class T, class F, std::size_t... I>
+constexpr void for_each_field_impl(T& t, F&& f, std::index_sequence<I...>, std::false_type /*move_values*/) {
+     const int v[] = {0, (
+         detail::for_each_field_impl_apply(sequence_tuple::get<I>(t), std::forward<F>(f), size_t_<I>{}, 1L),
+         0
+     )...};
+     (void)v;
+}
+
+
+template <class T, class F, std::size_t... I>
+constexpr void for_each_field_impl(T& t, F&& f, std::index_sequence<I...>, std::true_type /*move_values*/) {
+     const int v[] = {0, (
+         detail::for_each_field_impl_apply(sequence_tuple::get<I>(std::move(t)), std::forward<F>(f), size_t_<I>{}, 1L),
+         0
+     )...};
+     (void)v;
+}
+#else
+template <class T, class F, std::size_t... I>
+constexpr void for_each_field_impl(T& t, F&& f, std::index_sequence<I...>, std::false_type /*move_values*/) {
+     (detail::for_each_field_impl_apply(sequence_tuple::get<I>(t), std::forward<F>(f), size_t_<I>{}, 1L), ...);
+}
+
+template <class T, class F, std::size_t... I>
+constexpr void for_each_field_impl(T& t, F&& f, std::index_sequence<I...>, std::true_type /*move_values*/) {
+     (detail::for_each_field_impl_apply(sequence_tuple::get<I>(std::move(t)), std::forward<F>(f), size_t_<I>{}, 1L), ...);
+}
+#endif
+}}} // namespace boost::pfr::detail
+
+#endif // BOOST_PFR_DETAIL_FOR_EACH_FIELD_IMPL_HPP