uniform_pattern_type.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_COORDINATES_UNIFORM_PATTERN_TYPE_HPP
#define OPENKALMAN_COORDINATES_UNIFORM_PATTERN_TYPE_HPP

#include "collections/collections.hpp"
#include "coordinates/descriptors/Dimensions.hpp"
#include "coordinates/traits/dimension_of.hpp"
#include "coordinates/concepts/euclidean_pattern.hpp"
#include "coordinates/traits/common_descriptor_type.hpp"

namespace OpenKalman::coordinates
{
#ifdef __cpp_concepts
  template<typename T>
#else
  template<typename T, typename = void>
#endif
  struct uniform_pattern_type {};


#ifndef __cpp_concepts
  namespace detail
  {
    template<typename T, typename = void>
    struct common_descriptor_dimension_is_1 : std::false_type {};

    template<typename T>
    struct common_descriptor_dimension_is_1<T, std::void_t<typename common_descriptor_type<T>::type>>
      : std::bool_constant<values::fixed_value_compares_with<dimension_of<common_descriptor_type_t<T>>, 1>> {};
  }
#endif


#ifdef __cpp_concepts
  template<pattern T> requires
    euclidean_pattern<T> or
    values::fixed_value_compares_with<dimension_of<typename common_descriptor_type<T>::type>, 1>
  struct uniform_pattern_type<T>
#else
  template<typename T>
  struct uniform_pattern_type<T, std::enable_if_t<
    pattern<T> and (euclidean_pattern<T> or detail::common_descriptor_dimension_is_1<T>::value)>>
#endif
    : std::conditional_t<
      euclidean_pattern<T>,
      stdex::type_identity<Dimensions<1>>,
      common_descriptor_type<T>> {};


  template<typename T>
  using uniform_pattern_type_t = typename uniform_pattern_type<T>::type;


}

#endif