// Copyright (c) 2016-2020 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_FUNCTIONAL_HPP
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#define BOOST_PFR_DETAIL_FUNCTIONAL_HPP
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#pragma once
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#include <boost/pfr/detail/config.hpp>
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#include <functional>
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#include <boost/pfr/detail/sequence_tuple.hpp>
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namespace boost { namespace pfr { namespace detail {
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template <std::size_t I, std::size_t N>
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struct equal_impl {
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template <class T, class U>
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constexpr static bool cmp(const T& v1, const U& v2) noexcept {
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return ::boost::pfr::detail::sequence_tuple::get<I>(v1) == ::boost::pfr::detail::sequence_tuple::get<I>(v2)
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&& equal_impl<I + 1, N>::cmp(v1, v2);
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}
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};
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template <std::size_t N>
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struct equal_impl<N, N> {
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template <class T, class U>
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constexpr static bool cmp(const T&, const U&) noexcept {
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return T::size_v == U::size_v;
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}
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};
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template <std::size_t I, std::size_t N>
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struct not_equal_impl {
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template <class T, class U>
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constexpr static bool cmp(const T& v1, const U& v2) noexcept {
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return ::boost::pfr::detail::sequence_tuple::get<I>(v1) != ::boost::pfr::detail::sequence_tuple::get<I>(v2)
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|| not_equal_impl<I + 1, N>::cmp(v1, v2);
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}
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};
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template <std::size_t N>
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struct not_equal_impl<N, N> {
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template <class T, class U>
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constexpr static bool cmp(const T&, const U&) noexcept {
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return T::size_v != U::size_v;
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}
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};
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template <std::size_t I, std::size_t N>
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struct less_impl {
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template <class T, class U>
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constexpr static bool cmp(const T& v1, const U& v2) noexcept {
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return sequence_tuple::get<I>(v1) < sequence_tuple::get<I>(v2)
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|| (sequence_tuple::get<I>(v1) == sequence_tuple::get<I>(v2) && less_impl<I + 1, N>::cmp(v1, v2));
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}
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};
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template <std::size_t N>
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struct less_impl<N, N> {
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template <class T, class U>
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constexpr static bool cmp(const T&, const U&) noexcept {
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return T::size_v < U::size_v;
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}
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};
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template <std::size_t I, std::size_t N>
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struct less_equal_impl {
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template <class T, class U>
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constexpr static bool cmp(const T& v1, const U& v2) noexcept {
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return sequence_tuple::get<I>(v1) < sequence_tuple::get<I>(v2)
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|| (sequence_tuple::get<I>(v1) == sequence_tuple::get<I>(v2) && less_equal_impl<I + 1, N>::cmp(v1, v2));
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}
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};
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template <std::size_t N>
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struct less_equal_impl<N, N> {
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template <class T, class U>
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constexpr static bool cmp(const T&, const U&) noexcept {
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return T::size_v <= U::size_v;
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}
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};
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template <std::size_t I, std::size_t N>
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struct greater_impl {
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template <class T, class U>
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constexpr static bool cmp(const T& v1, const U& v2) noexcept {
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return sequence_tuple::get<I>(v1) > sequence_tuple::get<I>(v2)
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|| (sequence_tuple::get<I>(v1) == sequence_tuple::get<I>(v2) && greater_impl<I + 1, N>::cmp(v1, v2));
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}
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};
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template <std::size_t N>
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struct greater_impl<N, N> {
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template <class T, class U>
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constexpr static bool cmp(const T&, const U&) noexcept {
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return T::size_v > U::size_v;
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}
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};
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template <std::size_t I, std::size_t N>
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struct greater_equal_impl {
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template <class T, class U>
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constexpr static bool cmp(const T& v1, const U& v2) noexcept {
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return sequence_tuple::get<I>(v1) > sequence_tuple::get<I>(v2)
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|| (sequence_tuple::get<I>(v1) == sequence_tuple::get<I>(v2) && greater_equal_impl<I + 1, N>::cmp(v1, v2));
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}
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};
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template <std::size_t N>
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struct greater_equal_impl<N, N> {
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template <class T, class U>
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constexpr static bool cmp(const T&, const U&) noexcept {
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return T::size_v >= U::size_v;
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}
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};
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template <typename SizeT>
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constexpr void hash_combine(SizeT& seed, SizeT value) noexcept {
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seed ^= value + 0x9e3779b9 + (seed<<6) + (seed>>2);
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}
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template <typename T>
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auto compute_hash(const T& value, long /*priority*/)
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-> decltype(std::hash<T>()(value))
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{
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return std::hash<T>()(value);
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}
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template <typename T>
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std::size_t compute_hash(const T& /*value*/, int /*priority*/) {
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static_assert(sizeof(T) && false, "====================> Boost.PFR: std::hash not specialized for type T");
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return 0;
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}
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template <std::size_t I, std::size_t N>
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struct hash_impl {
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template <class T>
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constexpr static std::size_t compute(const T& val) noexcept {
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std::size_t h = detail::compute_hash( ::boost::pfr::detail::sequence_tuple::get<I>(val), 1L );
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detail::hash_combine(h, hash_impl<I + 1, N>::compute(val) );
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return h;
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}
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};
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template <std::size_t N>
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struct hash_impl<N, N> {
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template <class T>
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constexpr static std::size_t compute(const T&) noexcept {
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return 0;
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}
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};
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///////////////////// Define min_element and to avoid inclusion of <algorithm>
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constexpr std::size_t min_size(std::size_t x, std::size_t y) noexcept {
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return x < y ? x : y;
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}
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template <template <std::size_t, std::size_t> class Visitor, class T, class U>
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bool binary_visit(const T& x, const U& y) {
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constexpr std::size_t fields_count_lhs = detail::fields_count<std::remove_reference_t<T>>();
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constexpr std::size_t fields_count_rhs = detail::fields_count<std::remove_reference_t<U>>();
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constexpr std::size_t fields_count_min = detail::min_size(fields_count_lhs, fields_count_rhs);
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typedef Visitor<0, fields_count_min> visitor_t;
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#if BOOST_PFR_USE_CPP17 || BOOST_PFR_USE_LOOPHOLE
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return visitor_t::cmp(detail::tie_as_tuple(x), detail::tie_as_tuple(y));
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#else
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bool result = true;
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::boost::pfr::detail::for_each_field_dispatcher(
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x,
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[&result, &y](const auto& lhs) {
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::boost::pfr::detail::for_each_field_dispatcher(
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y,
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[&result, &lhs](const auto& rhs) {
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result = visitor_t::cmp(lhs, rhs);
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},
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detail::make_index_sequence<fields_count_rhs>{}
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);
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},
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detail::make_index_sequence<fields_count_lhs>{}
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);
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return result;
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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_FUNCTIONAL_HPP
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