85 lines
2.8 KiB
C++
85 lines
2.8 KiB
C++
#include <ylt/struct_pack.hpp>
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#include "template.h"
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struct person {
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int64_t id;
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std::string name;
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int age;
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double salary;
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};
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//STRUCT_PACK_REFL(person, ID, name, age);
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inline person& STRUCT_PACK_REFL_FLAG(person& t) {
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return t;
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}
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template<typename T> constexpr std::size_t STRUCT_PACK_FIELD_COUNT_IMPL();
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template<> constexpr std::size_t STRUCT_PACK_FIELD_COUNT_IMPL<person>() {
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return 3;
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}
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inline decltype(auto) STRUCT_PACK_FIELD_COUNT(const person&) {
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return std::integral_constant<std::size_t, 3>{};
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}
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template<std::size_t I> auto& STRUCT_PACK_GET(person& c) {
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if constexpr (0 == I) {
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return c.age;
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} if constexpr (1 == I) {
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return c.name;
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} if constexpr (2 == I) {
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return c.ID;
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}
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else {
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static_assert(I < STRUCT_PACK_FIELD_COUNT_IMPL<person>());
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}
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}
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template<std::size_t I> const auto& STRUCT_PACK_GET(const person& c) {
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if constexpr (0 == I) {
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return c.age;
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} if constexpr (1 == I) {
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return c.name;
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} if constexpr (2 == I) {
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return c.ID;
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}
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else {
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static_assert(I < STRUCT_PACK_FIELD_COUNT_IMPL<person>());
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}
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}
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inline auto& STRUCT_PACK_GET_0(person& c) {
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return STRUCT_PACK_GET<STRUCT_PACK_FIELD_COUNT_IMPL<person>() - 1 - 0>(c);
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}
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inline auto& STRUCT_PACK_GET_1(person& c) {
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return STRUCT_PACK_GET<STRUCT_PACK_FIELD_COUNT_IMPL<person>() - 1 - 1>(c);
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}
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inline auto& STRUCT_PACK_GET_2(person& c) {
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return STRUCT_PACK_GET<STRUCT_PACK_FIELD_COUNT_IMPL<person>() - 1 - 2>(c);
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}
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inline const auto& STRUCT_PACK_GET_0(const person& c) {
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return STRUCT_PACK_GET<STRUCT_PACK_FIELD_COUNT_IMPL<person>() - 1 - 0>(c);
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}
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inline const auto& STRUCT_PACK_GET_1(const person& c) {
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return STRUCT_PACK_GET<STRUCT_PACK_FIELD_COUNT_IMPL<person>() - 1 - 1>(c);
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}
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inline const auto& STRUCT_PACK_GET_2(const person& c) {
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return STRUCT_PACK_GET<STRUCT_PACK_FIELD_COUNT_IMPL<person>() - 1 - 2>(c);
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};
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int main() {
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person person1{ .id = 1, .name = "hello struct pack", .age = 20, .salary = 1024.42 };
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using type = remove_cvref_t<decltype(person1)>;
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auto c1 = members_count<type>;
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int c2 = members_count_impl<type>();
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int c3 = detail::members_count<type>();
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auto id = detail::get_type_id<type>();
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auto t1 = type_struct<type>;
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auto t2 = type_string<decltype(person1.name)>;
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auto t3 = type_u32<decltype(person1.age)>;
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visit_struct_info<decltype(person1)>(person1);
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visit_member_info<>(person1.name, person1.age);
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auto sz_info = detail::calculate_payload_size(person1);
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// 1行代码序列化
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vector<char> buffer = serialize(person1);
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// 只反序列化person的第2个字段
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auto name = get_field<person, 1>(buffer.data(), buffer.size());
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cout << "hello " << name.value() << "Count == " << c1;
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} |