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template <typename Type, typename = void>
struct map_usage {
[[nodiscard]] static bool State() noexcept { return true; }
}
template <typename, typename = void>
struct is_used_map : std::false_type {}
template <typename Type>
struct is_used_map<Type, std::void_t<decltype(map_usage<Type>::State())>> : std::true_type {};
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template <typename Type>
static constexpr bool is_used_map_t = is_used_map<Type>::value;
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struct is_used_map<Type, std::void_t<decltype(map_usage<Type>::State())>> : std::true_type {};AF
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