vector_space_descriptor_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_VECTOR_SPACE_DESCRIPTOR_OF_HPP
#define OPENKALMAN_VECTOR_SPACE_DESCRIPTOR_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 vector_space_descriptor_of {};


#ifdef __cpp_concepts
  template<indexible T, std::size_t N> requires requires(T t) { {get_vector_space_descriptor<N>(t)} -> coordinates::pattern; }
  struct vector_space_descriptor_of<T, N>
#else
  template<typename T, std::size_t N>
  struct vector_space_descriptor_of<T, N, std::enable_if_t<coordinates::pattern<decltype(get_vector_space_descriptor<N>(std::declval<T>()))>>>
#endif
  {
    using type = std::decay_t<decltype(get_vector_space_descriptor<N>(std::declval<T>()))>;
  };


  template<typename T, std::size_t N>
  using vector_space_descriptor_of_t = typename vector_space_descriptor_of<T, N>::type;


} // namespace OpenKalman

#endif //OPENKALMAN_VECTOR_SPACE_DESCRIPTOR_OF_HPP