to_dense_object.hpp

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/* This file is part of OpenKalman, a header-only C++ library for
 * Kalman filters and other recursive filters.
 *
 * Copyright (c) 2022-2024 Christopher Lee Ogden <ogden@gatech.edu>
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at https://mozilla.org/MPL/2.0/.
 */

#ifndef OPENKALMAN_TO_DENSE_OBJECT_HPP
#define OPENKALMAN_TO_DENSE_OBJECT_HPP

namespace OpenKalman
{
#ifdef __cpp_concepts
  template<indexible T, data_layout layout = data_layout::none, values::number Scalar = scalar_type_of_t<T>, indexible Arg> requires
    (layout != data_layout::stride)
  constexpr writable decltype(auto)
#else
  template<typename T, data_layout layout = data_layout::none, typename Scalar = scalar_type_of_t<T>, typename Arg, std::enable_if_t<
    indexible<T> and (layout != data_layout::stride) and values::number<Scalar> and indexible<Arg>, int> = 0>
  constexpr decltype(auto)
#endif
  to_dense_object(Arg&& arg)
  {
    if constexpr (writable<Arg>)
    {
      return std::forward<Arg>(arg);
    }
    else if constexpr (writable<decltype(to_native_matrix<T>(std::declval<Arg&&>()))>)
    {
      return to_native_matrix<T>(std::forward<Arg>(arg));
    }
    else
    {
      auto m {make_dense_object<T, layout, Scalar>(all_vector_space_descriptors(arg))};
      copy(m, std::forward<Arg>(arg));
      return m;
    }
  }


#ifdef __cpp_concepts
  template<data_layout layout, values::number Scalar, indexible Arg> requires (layout != data_layout::stride)
  constexpr writable decltype(auto)
#else
  template<data_layout layout, typename Scalar, typename Arg, std::enable_if_t<values::number<Scalar> and indexible<Arg> and
    (layout != data_layout::stride), int> = 0>
  constexpr decltype(auto)
#endif
  to_dense_object(Arg&& arg)
  {
    if constexpr (writable<Arg> and std::is_same_v<Scalar, scalar_type_of_t<Arg>>)
      return std::forward<Arg>(arg);
    else
      return to_dense_object<std::decay_t<Arg>, layout, Scalar>(std::forward<Arg>(arg));
  }


#ifdef __cpp_concepts
  template<data_layout layout = data_layout::none, indexible Arg> requires (layout != data_layout::stride)
  constexpr writable decltype(auto)
#else
  template<data_layout layout = data_layout::none, typename Arg, std::enable_if_t<indexible<Arg> and (layout != data_layout::stride), int> = 0>
  constexpr decltype(auto)
#endif
  to_dense_object(Arg&& arg)
  {
    if constexpr (writable<Arg>)
      return std::forward<Arg>(arg);
    else
      return to_dense_object<std::decay_t<Arg>, layout, scalar_type_of_t<Arg>>(std::forward<Arg>(arg));
  }


}

#endif