230 lines
7.4 KiB
C++
230 lines
7.4 KiB
C++
/*
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* Copyright (c) 2023, Alibaba Group Holding Limited;
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#pragma once
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#include <cassert>
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#include <cstdint>
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#include <memory>
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#include <tuple>
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#include "error_code.hpp"
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#include "marco.h"
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#include "size_info.hpp"
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#include "util.h"
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namespace struct_pack {
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template <typename... Args>
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STRUCT_PACK_INLINE constexpr std::uint32_t get_type_code();
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namespace detail {
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struct MD5_pair {
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uint32_t md5;
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uint32_t index;
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constexpr friend bool operator<(const MD5_pair &l, const MD5_pair &r) {
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return l.md5 < r.md5;
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}
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constexpr friend bool operator>(const MD5_pair &l, const MD5_pair &r) {
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return l.md5 > r.md5;
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}
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constexpr friend bool operator==(const MD5_pair &l, const MD5_pair &r) {
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return l.md5 == r.md5;
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}
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};
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template <typename T>
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constexpr uint32_t get_types_code();
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template <typename DerivedClasses>
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struct MD5_set {
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static constexpr int size = std::tuple_size_v<DerivedClasses>;
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static_assert(size <= 256);
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private:
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template <std::size_t... Index>
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static constexpr std::array<MD5_pair, size> calculate_md5(
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std::index_sequence<Index...>) {
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std::array<MD5_pair, size> md5{};
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((md5[Index] =
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MD5_pair{
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get_types_code<std::tuple_element_t<Index, DerivedClasses>>(),
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Index}),
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...);
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compile_time_sort(md5);
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return md5;
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}
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static constexpr std::size_t has_hash_collision_impl() {
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for (std::size_t i = 1; i < size; ++i) {
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if (value[i - 1] == value[i]) {
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return value[i].index;
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}
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}
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return 0;
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}
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public:
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static constexpr std::array<MD5_pair, size> value =
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calculate_md5(std::make_index_sequence<size>());
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static constexpr std::size_t has_hash_collision = has_hash_collision_impl();
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};
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template <typename BaseClass, typename DerivedClasses>
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struct public_base_class_checker {
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static_assert(std::tuple_size_v<DerivedClasses> <= 256);
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private:
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template <std::size_t... Index>
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static constexpr bool calculate_md5(std::index_sequence<Index...>) {
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return (std::is_base_of_v<BaseClass,
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std::tuple_element_t<Index, DerivedClasses>> &&
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...);
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}
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public:
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static constexpr bool value = public_base_class_checker::calculate_md5(
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std::make_index_sequence<std::tuple_size_v<DerivedClasses>>());
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};
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template <typename DerivedClasses>
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struct deserialize_derived_class_helper {
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template <size_t index, typename BaseClass, typename unpack>
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static STRUCT_PACK_INLINE constexpr struct_pack::err_code run(
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std::unique_ptr<BaseClass> &base, unpack &unpacker) {
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if constexpr (index >= std::tuple_size_v<DerivedClasses>) {
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unreachable();
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}
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else {
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using derived_class = std::tuple_element_t<index, DerivedClasses>;
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base = std::make_unique<derived_class>();
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return unpacker.deserialize(*(derived_class *)base.get());
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}
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}
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};
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template <typename T, uint64_t parent_tag = 0>
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constexpr size_info inline calculate_one_size(const T &item);
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template <typename DerivedClasses>
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struct calculate_one_size_derived_class_helper {
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template <size_t index, typename BaseClass>
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static STRUCT_PACK_INLINE constexpr size_info run(BaseClass *base) {
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if constexpr (index >= std::tuple_size_v<DerivedClasses>) {
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unreachable();
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}
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else {
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using derived_class = std::tuple_element_t<index, DerivedClasses>;
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#ifdef STRUCT_PACK_RTTI_ENABLED
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assert(dynamic_cast<derived_class *>(base));
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#endif
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return calculate_one_size(*(derived_class *)base);
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}
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}
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};
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template <typename DerivedClasses, typename size_type, typename version>
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struct serialize_one_derived_class_helper {
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template <size_t index, typename packer, typename BaseClass>
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static STRUCT_PACK_INLINE constexpr void run(packer *self, BaseClass *base) {
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if constexpr (index >= std::tuple_size_v<DerivedClasses>) {
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unreachable();
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}
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else {
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using derived_class = std::tuple_element_t<index, DerivedClasses>;
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#ifdef STRUCT_PACK_RTTI_ENABLED
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assert(dynamic_cast<derived_class *>(base));
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#endif
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self->template serialize_one<size_type::value, version::value>(
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*(derived_class *)base);
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}
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}
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};
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template <typename DerivedClasses, typename size_type, typename version,
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typename NotSkip>
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struct deserialize_one_derived_class_helper {
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template <size_t index, typename unpacker, typename Pointer>
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static STRUCT_PACK_INLINE constexpr struct_pack::err_code run(unpacker *self,
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Pointer &base) {
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if constexpr (index >= std::tuple_size_v<DerivedClasses>) {
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unreachable();
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}
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else {
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using derived_class = std::tuple_element_t<index, DerivedClasses>;
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base = std::make_unique<derived_class>();
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return self->template deserialize_one<size_type::value, version::value,
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NotSkip::value>(
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*(derived_class *)base.get());
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}
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}
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};
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template <typename Base>
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using derived_class_set_t = decltype(struct_pack_derived_decl((Base *)nullptr));
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template <typename Base>
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constexpr std::size_t search_type_by_md5(uint32_t id, bool &ok) {
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constexpr auto &MD5s = MD5_set<derived_class_set_t<Base>>::value;
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auto result = std::lower_bound(MD5s.begin(), MD5s.end(), MD5_pair{id, 0});
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ok = (result != MD5s.end() && result->md5 == id);
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if (!ok)
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return MD5s.size();
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else
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return result->index;
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}
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template <typename T>
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std::uint32_t get_struct_pack_id_impl() {
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if constexpr (std::is_abstract_v<T>) {
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struct_pack::detail::unreachable();
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}
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else {
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return struct_pack::get_type_code<T>();
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}
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}
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template <typename Base, typename... Derives>
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constexpr auto derived_decl_impl() {
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if constexpr (std::is_abstract_v<Base>) {
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return struct_pack::detail::declval<std::tuple<Derives...>>();
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}
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else {
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return struct_pack::detail::declval<std::tuple<Base, Derives...>>();
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}
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}
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template <typename Base, typename... Derives>
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constexpr bool check_ID_collision() {
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if constexpr (std::is_abstract_v<Base>) {
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constexpr auto has_collision = struct_pack::detail::MD5_set<
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std::tuple<Derives...>>::has_hash_collision;
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if constexpr (has_collision != 0) {
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static_assert(
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!sizeof(std::tuple_element_t<has_collision, std::tuple<Derives...>>),
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"ID collision happened, consider add member `static "
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"constexpr uint64_t struct_pack_id` for collision type. ");
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}
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}
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else {
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constexpr auto has_collision = struct_pack::detail::MD5_set<
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std::tuple<Base, Derives...>>::has_hash_collision;
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if constexpr (has_collision != 0) {
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static_assert(!sizeof(std::tuple_element_t<has_collision,
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std::tuple<Base, Derives...>>),
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"ID collision happened, consider add member `static "
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"constexpr uint64_t struct_pack_id` for collision type. ");
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}
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}
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return true;
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}
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} // namespace detail
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} // namespace struct_pack
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