SharedBField.hpp

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// This file is part of the Acts project.
//
// Copyright (C) 2017-2018 CERN for the benefit of the Acts project
//
// 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 http://mozilla.org/MPL/2.0/.

#pragma once

#include "Acts/Utilities/Definitions.hpp"

#include <memory>

namespace Acts {

template <typename BField>
class SharedBField {
 public:
  // typedef wrapped BField's cache type
  using Cache = typename BField::Cache;

  SharedBField() = delete;

  SharedBField(std::shared_ptr<const BField> bField) : m_bField(bField) {}

  Vector3D getField(const Vector3D& position) const {
    return m_bField->getField(position);
  }

  Vector3D getField(const Vector3D& position, Cache& cache) const {
    return m_bField->getField(position, cache);
  }

  Vector3D getFieldGradient(const Vector3D& position,
                            ActsMatrixD<3, 3>& derivative) const {
    return m_bField->getFieldGradient(position, derivative);
  }

  Vector3D getFieldGradient(const Vector3D& position,
                            ActsMatrixD<3, 3>& derivative, Cache& cache) const {
    return m_bField->getFieldGradient(position, derivative, cache);
  }

 private:
  std::shared_ptr<const BField> m_bField;
};

}  // namespace Acts