draconisplusplus/include/rfl/to_named_tuple.hpp

#ifndef RFL_TO_NAMED_TUPLE_HPP_
#define RFL_TO_NAMED_TUPLE_HPP_

#include <iostream>
#include <tuple>
#include <type_traits>

#include "always_false.hpp"
#include "internal/copy_to_field_tuple.hpp"
#include "internal/has_flatten_fields.hpp"
#include "internal/is_field.hpp"
#include "internal/is_named_tuple.hpp"
#include "internal/move_field_tuple_to_named_tuple.hpp"
#include "internal/move_to_field_tuple.hpp"
#include "make_named_tuple.hpp"

namespace rfl {

  /// Generates the named tuple that is equivalent to the struct _t.
  /// If _t already is a named tuple, then _t will be returned.
  /// All fields of the struct must be an rfl::Field.
  auto to_named_tuple(auto&& _t) {
    using T = std::remove_cvref_t<decltype(_t)>;
    if constexpr (internal::is_named_tuple_v<std::remove_cvref_t<T>>) {
      return _t;
    } else if constexpr (internal::is_field_v<std::remove_cvref_t<T>>) {
      return make_named_tuple(std::forward<T>(_t));
    } else if constexpr (std::is_lvalue_reference<T> {}) {
      auto field_tuple = internal::copy_to_field_tuple(_t);
      return internal::move_field_tuple_to_named_tuple(std::move(field_tuple));
    } else {
      auto field_tuple = internal::move_to_field_tuple(_t);
      return internal::move_field_tuple_to_named_tuple(std::move(field_tuple));
    }
  }

  /// Generates the named tuple that is equivalent to the struct _t.
  /// If _t already is a named tuple, then _t will be returned.
  /// All fields of the struct must be an rfl::Field.
  template <class ProcessorsType>
  auto to_named_tuple(const auto& _t) {
    using T = std::remove_cvref_t<decltype(_t)>;
    if constexpr (internal::is_named_tuple_v<std::remove_cvref_t<T>>) {
      return _t;
    } else if constexpr (internal::is_field_v<std::remove_cvref_t<T>>) {
      return make_named_tuple(_t);
    } else {
      auto field_tuple = internal::copy_to_field_tuple(_t);
      return internal::move_field_tuple_to_named_tuple(std::move(field_tuple));
    }
  }

} // namespace rfl

#endif