draconisplusplus/include/rfl/internal/copy_flattened_tuple_to_named_tuple.hpp

#ifndef RFL_INTERNAL_COPY_FLATTENED_TUPLE_TO_NAMED_TUPLE_HPP_
#define RFL_INTERNAL_COPY_FLATTENED_TUPLE_TO_NAMED_TUPLE_HPP_

#include <functional>
#include <tuple>
#include <type_traits>

#include "../Field.hpp"
#include "../make_named_tuple.hpp"
#include "lit_name.hpp"

namespace rfl {
  namespace internal {

    template <class FieldNames, class... Fields>
    auto copy_flattened_tuple_to_named_tuple(const auto& _flattened_tuple,
                                             Fields&&... _fields) {
      constexpr auto size =
          std::tuple_size_v<std::remove_cvref_t<decltype(_flattened_tuple)>>;
      constexpr auto i = sizeof...(_fields);
      if constexpr (i == size) {
        return make_named_tuple(std::move(_fields)...);
      } else {
        const auto name_literal = FieldNames::template name_of<i>();
        auto new_field          = rfl::make_field<
                     lit_name_v<std::remove_cvref_t<decltype(name_literal)>>>(
            std::get<i>(_flattened_tuple));
        return copy_flattened_tuple_to_named_tuple<FieldNames>(
            _flattened_tuple, std::move(_fields)..., std::move(new_field));
      }
    }

  } // namespace internal
} // namespace rfl

#endif