best_vector_space_descriptor.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_BEST_VECTOR_SPACE_DESCRIPTOR_HPP
#define OPENKALMAN_BEST_VECTOR_SPACE_DESCRIPTOR_HPP

#include "linear-algebra/coordinates/concepts/compares_with.hpp"

namespace OpenKalman::internal
{
#ifdef __cpp_concepts
  template<coordinates::pattern D, coordinates::pattern...Ds> requires (... and compares_with<D, Ds, equal_to<>, Applicability::permitted>)
#else
  template<typename D, typename...Ds, std::enable_if_t<(... and compares_with<D, Ds, equal_to<>, Applicability::permitted>), int> = 0>
#endif
  constexpr decltype(auto) best_vector_space_descriptor(D&& d, Ds&&...ds)
  {
    if constexpr (sizeof...(Ds) == 0) return std::forward<D>(d);
    else if constexpr (fixed_pattern<D>) return std::forward<D>(d);
    else return best_vector_space_descriptor(std::forward<Ds>(ds)...);
  }


} // namespace OpenKalman::internal

#endif //OPENKALMAN_BEST_VECTOR_SPACE_DESCRIPTOR_HPP