size.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) 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_VALUE_SIZE_HPP
#define OPENKALMAN_VALUE_SIZE_HPP

#include <type_traits>
#include "index.hpp"

namespace OpenKalman::values
{
#ifdef __cpp_concepts
  template<typename T>
  concept size = index<T> or std::is_same_v<std::decay_t<T>, std::unreachable_sentinel_t>;
#else
  template<typename T>
  constexpr bool size = index<T> or std::is_same_v<std::decay_t<T>, unreachable_sentinel_t>;
#endif

} // namespace OpenKalman::values

#endif //OPENKALMAN_VALUE_SIZE_HPP