/*
 * Copyright (C) 2010-2022 The ESPResSo project
 *
 * This file is part of ESPResSo.
 *
 * ESPResSo is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * ESPResSo is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
#ifndef CORE_CONSTRAINTS_DETAIL_MASS_HPP
#define CORE_CONSTRAINTS_DETAIL_MASS_HPP

namespace FieldCoupling {
namespace Coupling {
class Mass {
public:
  static constexpr const bool is_linear = true;

  template <typename T, typename Particle>
  T operator()(const Particle &p, const T &x) const {
    if (not p.is_virtual()) {
      return p.mass() * x;
    }
    return T{};
  }
};
} // namespace Coupling
} // namespace FieldCoupling

#endif
