Program Listing for File htlist.hpp

↰ Return to documentation for file (include/htlist.hpp)

#pragma once

#include <cstddef>
namespace ctql {
    namespace detail {
        template <typename... T>
        struct HTList;

        template <>
        struct HTList<> {
            static constexpr std::size_t len = 0;
        };

        template <typename T0, typename... TRest>
        struct HTList<T0, TRest...> : HTList<TRest...> {
            using head_type = T0;
            using tail_type = HTList<TRest...>;

            static constexpr std::size_t len = 1 + sizeof...(TRest);
        };

        template <typename A, typename U>
        struct append {
            using type = U;
        };

        template <typename T0, typename... TRest, typename... Us>
        struct append<HTList<T0, TRest...>, HTList<Us...>> {
            using type = HTList<T0, TRest..., Us...>;
        };

        template <typename... T>
        HTList(T...) -> HTList<T...>;
    } // namespace detail
}