coordinate_descriptor_traits.hpp

/* This file is part of OpenKalman, a header-only C++ library for
 * Kalman filters and other recursive filters.
 *
 * Copyright (c) 2022-2025 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_COORDINATE_DESCRIPTOR_TRAITS_HPP
#define OPENKALMAN_COORDINATE_DESCRIPTOR_TRAITS_HPP

#include <typeindex>
#include "collections/collections.hpp"

namespace OpenKalman::interface
{
#ifdef __cpp_concepts
  template<typename T>
#else
  template<typename T, typename = void>
#endif
  struct coordinate_descriptor_traits
  {
    static constexpr bool
    is_specialized = false;

#ifdef DOXYGEN_SHOULD_SKIP_THIS

    static constexpr auto
    dimension = [](const T&) -> values::index auto { return std::integral_constant<std::size_t, 0_uz>{}; };


    static constexpr auto
    stat_dimension = [](const T&) noexcept -> values::index auto { return std::integral_constant<std::size_t, 0_uz>{}; };


    static constexpr auto
    is_euclidean = [](const T&) -> std::convertible_to<bool> auto { return std::false_type {}; };


    static constexpr auto
    hash_code = [](const T&) -> std::convertible_to<std::size_t> { return typeid(T).hash_code(); };


    static constexpr auto
    to_stat_space = [](const T& t, collections::collection_view auto&& data_view) -> collections::collection decltype(auto)
    {
      return collections::views::all(std::forward<decltype(data_view)>(data_view));
    };


    static constexpr auto
    from_stat_space = [](const T& t, collections::collection_view auto&& data_view) -> collections::collection decltype(auto)
    {
      return collections::views::all(std::forward<decltype(data_view)>(data_view));
    };


    static constexpr auto
    wrap = [](const T& t, collections::collection_view auto&& data_view) -> collections::collection decltype(auto)
    {
      return collections::views::all(std::forward<decltype(data_view)>(data_view));
    };

#endif

  };

}



#endif