fixed_pattern_collection.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) 2024-2025 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_COORDINATE::FIXED_PATTERN_COLLECTION_HPP
#define OPENKALMAN_COORDINATE

#ifdef __cpp_lib_ranges
#include <ranges>
#else
#include "basics/compatibility/ranges.hpp"
#endif
#include "collections/concepts/collection.hpp"
#include "pattern_collection.hpp"
#include "fixed_pattern.hpp"
#include "fixed_pattern_tuple.hpp"


namespace OpenKalman::coordinates
{
#ifndef __cpp_lib_ranges
  namespace detail
  {
    template<typename T, typename = void>
    struct is_fixed_descriptor_range : std::false_type {};
 
    template<typename T>
    struct is_fixed_descriptor_range<T, std::enable_if_t<fixed_pattern<ranges::range_value_t<T>>>>
      : std::true_type {};
  } // namespace detail
#endif 
    
    
  template<typename T>
#if defined(__cpp_lib_ranges) and defined(__cpp_lib_remove_cvref)
  concept fixed_pattern_collection = pattern_collection<T> and
    (fixed_pattern_tuple<T> or fixed_pattern<std::ranges::range_value_t<std::decay_t<T>>>);
#else
  constexpr bool fixed_pattern_collection = collections::collection<T> and
    (fixed_pattern_tuple<T> or detail::is_fixed_descriptor_range<T>::value);
#endif


} // namespace OpenKalman::coordinates

#endif //OPENKALMAN_COORDINATE