38 lines
1.6 KiB
C++
38 lines
1.6 KiB
C++
#pragma once
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#include <cstdint>
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namespace sp {
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/// @brief Default case, see field_index specialization for implementation details
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template <size_t N, typename T, template <size_t, typename> typename U, typename = void>
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static constexpr size_t field_index = 0;
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/// @brief A templated size_t that counts the number of existing classes U with a "field_name" member
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/// @tparam N Current counter for recursion (user should always call it with 0)
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/// @tparam T Can be any type, must be different for each field we want to be counted later (used because we can't have a empty
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/// template<> specialization nested in a class)
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/// @tparam U The templated class that will be searched for match
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template <size_t N, typename T, template <size_t, typename> typename U>
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static constexpr size_t field_index<N, T, U, std::void_t<decltype(U<N, T>::field_name)>> = 1 + field_index<N + 1, T, U>;
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/// @brief Concat multiple tuples in one big tuple
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/// @tparam ...input_t Multiple std::tuple types to concat
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template <typename... input_t>
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using tuple_cat_t = decltype(std::tuple_cat(std::declval<input_t>()...));
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template <typename T, typename Tuple>
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constexpr bool tuple_contains_type = false;
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template <typename T, typename... Ts>
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constexpr bool tuple_contains_type<T, std::tuple<Ts...>> = std::disjunction_v<std::is_same<T, Ts>...>;
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template <typename T, typename Tuple>
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constexpr int get_tuple_index = 0;
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template <typename T, typename... Rest>
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constexpr int get_tuple_index<T, std::tuple<T, Rest...>> = 0;
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template <typename T, typename First, typename... Rest>
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constexpr int get_tuple_index<T, std::tuple<First, Rest...>> = 1 + get_tuple_index<T, std::tuple<Rest...>>;
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} // namespace sp
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