euclidean_pattern.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) 2019-2025 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_EUCLIDEAN_VECTOR_SPACE_DESCRIPTOR_HPP
#define OPENKALMAN_EUCLIDEAN_VECTOR_SPACE_DESCRIPTOR_HPP

#include <type_traits>
#include "values/concepts/fixed.hpp"
#include "values/traits/fixed_number_of.hpp"
#include "linear-algebra/coordinates/concepts/pattern.hpp"
#include "linear-algebra/coordinates/functions/get_is_euclidean.hpp"

namespace OpenKalman::coordinates
{
#ifndef __cpp_concepts
  namespace detail
  {
    template<typename T, typename = void>
    struct euclidean_pattern_impl : std::false_type {};

    template<typename T>
    struct euclidean_pattern_impl<T, std::enable_if_t<values::fixed<decltype(coordinates::get_is_euclidean(std::declval<T>()))>>>
      : std::bool_constant<values::fixed_number_of_v<decltype(coordinates::get_is_euclidean(std::declval<T>()))>> {};
  }
#endif


#ifdef __cpp_concepts
  template<typename T>
  concept euclidean_pattern = pattern<T> and
    (values::fixed_number_of<decltype(coordinates::get_is_euclidean(std::declval<T>()))>::value);
#else
  template<typename T>
  constexpr bool euclidean_pattern = detail::euclidean_pattern_impl<T>::value;
#endif

} // namespace OpenKalman::coordinates

#endif //OPENKALMAN_EUCLIDEAN_VECTOR_SPACE_DESCRIPTOR_HPP