get_index_dimension_of.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) 2022-2023 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_GET_INDEX_DIMENSION_OF_HPP
#define OPENKALMAN_GET_INDEX_DIMENSION_OF_HPP


namespace OpenKalman
{
#ifdef __cpp_concepts
  template<typename T, values::index N = std::integral_constant<std::size_t, 0>> requires
    requires(T t, N n) { {get_vector_space_descriptor(t, n)} -> coordinates::pattern; }
  constexpr values::index auto
#else
  template<typename T, typename N = std::integral_constant<std::size_t, 0>, std::enable_if_t<
    coordinates::pattern<decltype(get_vector_space_descriptor(std::declval<T>(), std::declval<N>()))>, int> = 0>
  constexpr auto
#endif
  get_index_dimension_of(const T& t, N n = N{})
  {
    return get_dimension(get_vector_space_descriptor(t, n));
  }


#ifdef __cpp_concepts
  template<std::size_t N, typename T> requires requires(T t) { {get_vector_space_descriptor<N>(t)} -> coordinates::pattern; }
  constexpr values::index auto
#else
  template<std::size_t N, typename T, std::enable_if_t<
    coordinates::pattern<decltype(get_vector_space_descriptor<N>(std::declval<T>()))>, int> = 0>
  constexpr auto
#endif
  get_index_dimension_of(const T& t)
  {
    return get_dimension(get_vector_space_descriptor<N>(t));
  }


} // namespace OpenKalman

#endif //OPENKALMAN_GET_INDEX_DIMENSION_OF_HPP