count_indices.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_COUNT_INDICES_HPP
#define OPENKALMAN_COUNT_INDICES_HPP


namespace OpenKalman
{
#ifdef __cpp_concepts
  template<interface::count_indices_defined_for T>
  constexpr values::index auto
#else
  template<typename T, std::enable_if_t<interface::count_indices_defined_for<T>, int> = 0>
  constexpr auto
#endif
  count_indices(const T& t)
  {
    return interface::indexible_object_traits<T>::count_indices(t);
  }


} // namespace OpenKalman

#endif //OPENKALMAN_COUNT_INDICES_HPP