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) 2019-2023 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_INDEX_DIMENSION_OF_HPP
#define OPENKALMAN_INDEX_DIMENSION_OF_HPP


namespace OpenKalman
{
#ifdef __cpp_concepts
  template<typename T, std::size_t N = 0>
#else
  template<typename T, std::size_t N = 0, typename = void>
#endif
  struct index_dimension_of {};


  template<typename T, std::size_t N>
#ifdef __cpp_concepts
  requires requires { typename vector_space_descriptor_of_t<T, N>; }
  struct index_dimension_of<T, N>
#else
  struct index_dimension_of<T, N, std::void_t<typename vector_space_descriptor_of<T, N>::type>>
#endif
    : std::integral_constant<std::size_t, coordinates::dimension_of_v<vector_space_descriptor_of_t<T, N>>> {};


  template<typename T, std::size_t N = 0>
  static constexpr auto index_dimension_of_v = index_dimension_of<T, N>::value;


} // namespace OpenKalman

#endif //OPENKALMAN_INDEX_DIMENSION_OF_HPP