Traits.hpp

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#ifndef UTIL_META_TRAITS_HPP_
#define UTIL_META_TRAITS_HPP_
 
#include <tuple>
 
namespace util::meta
{
    template <typename... Args>
    struct Traits {
        using Tuple = std::tuple<Args...>;
        static constexpr auto Size = sizeof...(Args);
        template <std::size_t N>
        using Nth = typename std::tuple_element<N, Tuple>::type;
    };
 
    template <typename Arg, typename... Args>
    struct Traits<Arg, Args...> {
        using Tuple = std::tuple<Arg, Args...>;
        static constexpr size_t Size = 1 + sizeof...(Args);
        template <std::size_t N>
        using Nth = typename std::tuple_element<N, Tuple>::type;
        using First = Nth<0>;
        using Last = Nth<Size - 1>;
    };
 
} // namespace util::meta
 
#endif /* !UTIL_META_TRAITS_HPP_ */