DetectorInfoIterator.h

#ifndef MANTID_GEOMETRY_DETECTORINFOITERATOR_H_
#define MANTID_GEOMETRY_DETECTORINFOITERATOR_H_

#include <boost/iterator/iterator_facade.hpp>
#include <memory>

#include "MantidGeometry/Instrument/DetectorInfoItem.h"

using Mantid::Geometry::DetectorInfoItem;

namespace Mantid {
namespace Geometry {

class MANTID_GEOMETRY_DLL DetectorInfoIterator
    : public boost::iterator_facade<DetectorInfoIterator,
                                    const DetectorInfoItem &,
                                    boost::bidirectional_traversal_tag> {

public:
  DetectorInfoIterator(const DetectorInfo& owner, const size_t index) : m_item(owner, index) {}

private:
  friend class boost::iterator_core_access;

  void increment() { m_item.incrementIndex(); }

  bool equal(const DetectorInfoIterator &other) const {
    return m_item.getIndex() == other.m_item.getIndex();
  }

  const DetectorInfoItem &dereference() const { return m_item; }

  void decrement() { m_item.decrementIndex(); }

  void advance(int64_t delta) { m_item.advance(delta); }

  uint64_t distance_to(const DetectorInfoIterator &other) const {
    return static_cast<uint64_t>(other.m_item.getIndex()) -
           static_cast<uint64_t>(m_item.getIndex());
  }

  DetectorInfoItem m_item;
};

} // namespace Geometry
} // namespace Mantid

#endif /* MANTID_GEOMETRY_DETECTORINFOITERATOR_H_ */