make_zero.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) 2022-2024 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_MAKE_ZERO_HPP
#define OPENKALMAN_MAKE_ZERO_HPP

namespace OpenKalman
{
#ifdef __cpp_concepts
  template<indexible T, values::number Scalar = scalar_type_of_t<T>, pattern_collection Descriptors>
  constexpr zero auto
#else
  template<typename T, typename Scalar = scalar_type_of_t<T>, typename...Ds, std::enable_if_t<indexible<T> and
    values::number<Scalar> and pattern_collection<Descriptors>, int> = 0>
  constexpr auto
#endif
  make_zero(Descriptors&& descriptors)
  {
    return make_constant<T, Scalar, 0>(std::forward<Descriptors>(descriptors));
  }


#ifdef __cpp_concepts
  template<indexible T, values::number Scalar = scalar_type_of_t<T>, coordinates::pattern...Ds>
  constexpr zero auto
#else
  template<typename T, typename Scalar = scalar_type_of_t<T>, typename...Ds, std::enable_if_t<indexible<T> and
    values::number<Scalar> and (... and coordinates::pattern<Ds>), int> = 0>
  constexpr auto
#endif
  make_zero(Ds&&...ds)
  {
    return make_zero<T, Scalar>(std::tuple {std::forward<Ds>(ds)...});
  }


#ifdef __cpp_concepts
  template<values::number Scalar, indexible T>
  constexpr zero auto
#else
  template<typename Scalar, typename T, std::enable_if_t<values::number<Scalar> and indexible<T>, int> = 0>
  constexpr auto
#endif
  make_zero(const T& t)
  {
    return make_constant<Scalar, 0>(t);
  }


#ifdef __cpp_concepts
  template<indexible T>
  constexpr zero auto
#else
  template<typename T, std::enable_if_t<indexible<T>, int> = 0>
  constexpr auto
#endif
  make_zero(const T& t)
  {
    return make_constant<scalar_type_of_t<T>, 0>(t);
  }


} // namespace OpenKalman

#endif //OPENKALMAN_MAKE_ZERO_HPP