fixed_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_COORDINATE_FIXED_PATTERN_HPP
#define OPENKALMAN_COORDINATE_FIXED_PATTERN_HPP

#include "collections/collections.hpp"
#include "pattern.hpp"
#include "coordinates/traits/dimension_of.hpp"

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

    template<typename T>
    struct fixed_pattern_impl<T, std::enable_if_t<dimension_of<T>::value != stdex::dynamic_extent>> : std::true_type {};
  }
#endif


  template<typename T>
#ifdef __cpp_concepts
  concept fixed_pattern =
    pattern<T> and
    (dimension_of<T>::value != stdex::dynamic_extent);
#else
  constexpr bool fixed_pattern =
    pattern<T> and
    detail::fixed_pattern_impl<T>::value;
#endif

}

#endif