58 lines
2.1 KiB
C++
58 lines
2.1 KiB
C++
#include <ylt/struct_pack.hpp>
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#include <iostream>
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using namespace std;
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using namespace struct_pack;
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using UniversalVectorType = detail::UniversalVectorType;
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using UniversalType = detail::UniversalType;
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using UniversalOptionalType = detail::UniversalOptionalType;
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using UniversalIntegralType = detail::UniversalIntegralType;
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using UniversalNullptrType = detail::UniversalNullptrType;
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using UniversalCompatibleType = detail::UniversalCompatibleType;
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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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template <typename T, typename construct_param_t, typename = void, typename... Args>
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struct is_constructable_impl : std::false_type {};
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template <typename T, typename construct_param_t, typename... Args>
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struct is_constructable_impl < T, construct_param_t,
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std::void_t<
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decltype(T{ {Args{}}..., {construct_param_t{}} }) > , Args... >
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: std::true_type {};
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template <typename T, typename construct_param_t, typename... Args>
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bool is_constructable = is_constructable_impl<T, construct_param_t, void, Args...>::value;
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template <typename T, typename... Args>
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std::size_t members_count_impl() {
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if (is_constructable<T, UniversalVectorType, Args...>) {
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cout << "is_constructable UniversalVectorType \n";
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//return members_count_impl<T, Args..., UniversalVectorType>();
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}
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else if (is_constructable<T, UniversalType, Args...>) {
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cout << "is_constructable UniversalType \n";
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//return members_count_impl<T, UniversalType, Args...>();
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}
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else {
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return sizeof...(Args);
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}
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return sizeof...(Args);
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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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using type2 = remove_cvref_t<type>;
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auto Count = members_count<type>;
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int isc = members_count_impl<type2>();
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int c2 = detail::members_count<type>();
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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 == " << Count << c2;
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} |