80 lines
2.5 KiB
C++
80 lines
2.5 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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/*
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获取对象成员数量
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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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constexpr 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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constexpr std::size_t members_count_impl() {
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if constexpr (is_constructable<T, UniversalVectorType, Args...>) {
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return members_count_impl<T, Args..., UniversalVectorType>();
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}
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else if constexpr (is_constructable<T, UniversalType, Args...>) {
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cout << "is_constructable UniversalType \n";
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return members_count_impl<T, Args..., UniversalType>();
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}
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return sizeof...(Args);
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}
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/*
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获取成员类型
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*/
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template <typename Type>
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concept type_string = requires(Type container) {
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requires detail::is_char_t<typename std::remove_cvref_t<Type>::value_type>;
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container.length();
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container.data();
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};
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template <typename Type>
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concept type_struct = requires(Type container) {
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requires std::is_class_v<Type>;
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};
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template <typename Type>
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concept type_u32 = requires(Type container) {
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requires sizeof(Type) == 4;
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};
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/*
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获取成员信息
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*/
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template <typename T>
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constexpr void visit_one_member_info(T& item) {
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constexpr auto id = detail::get_type_id<T, 0>();
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cout << "visit_one_member_info::" << (int)id << "=" << item << "\n";
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}
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template <typename... Args>
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void visit_member_info(Args&...args) {
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cout << "visit_member_info::" << sizeof...(args) << "\n";
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(visit_one_member_info(args), ...);
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}
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template <typename T>
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void visit_struct_info(T& item) {
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int count = members_count_impl<T>();
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auto visitor = [](auto&&... items) {
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visit_member_info<>(items...);
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};
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if (count == 4) {
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auto&& [a1, a2, a3, a4] = item;
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visitor(a1, a2, a3, a4);
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}
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} |