42 lines
1.2 KiB
C++
42 lines
1.2 KiB
C++
#pragma once
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// tuple utils
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#include <tuple>
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namespace meta
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{
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template<typename Tuple, template<typename ...> typename Wrap>
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struct tuple_wrap;
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template<typename Tuple, template<typename ...> typename Wrap>
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using tuple_wrap_t = typename tuple_wrap<Tuple, Wrap>::type;
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template<typename...Ts>
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using tuple_cat_t = decltype(std::tuple_cat(std::declval<Ts>()...));
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template<typename T1, typename T2>
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struct tuple_join;
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template<typename T1, typename T2>
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using tuple_join_t = typename tuple_join<T1, T2>::type;
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template <typename T, typename Tuple, std::size_t Index = 0>
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consteval std::size_t index_in_tuple() {
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if constexpr (Index == std::tuple_size_v<Tuple>) {
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return Index; // 如果没有找到，返回元组的大小作为标志
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}
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else if constexpr (std::is_same_v<T, std::tuple_element_t<Index, Tuple>>) {
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return Index; // 找到匹配的类型，返回当前索引
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}
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else {
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return index_in_tuple<T, Tuple, Index + 1>(); // 递归检查下一个索引
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}
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}
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template<typename FindMe, typename Tuple>
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constexpr uint8_t index_in_tuple_v = index_in_tuple<FindMe, Tuple>();
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template<typename T, typename ... Args>
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constexpr auto tuple_construct(const std::tuple<Args...>&) noexcept;
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} |