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 *  Point Cloud Library (PCL) - www.pointclouds.org
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#ifndef PCL_ML_MULTI_CHANNEL_2D_COMPARISON_FEATURE_H_
#define PCL_ML_MULTI_CHANNEL_2D_COMPARISON_FEATURE_H_

#include <pcl/common/common.h>

#include <istream>
#include <ostream>

namespace pcl {

/** \brief Feature for comparing two sample points in 2D multi-channel data. */
template <class PointT> class PCL_EXPORTS MultiChannel2DComparisonFeature {
  public:
    /** \brief Constructor. */
    MultiChannel2DComparisonFeature() : p1(), p2(), channel(0) {}
    /** \brief Destructor. */
    virtual ~MultiChannel2DComparisonFeature() {}

    /** \brief Serializes the feature to a stream.
     * \param[out] stream The destination for the serialization.
     */
    inline void serialize(std::ostream &stream) const {
        p1.serialize(stream);
        p2.serialize(stream);
        stream.write(reinterpret_cast<const char *>(&channel), sizeof(channel));
    }

    /** \brief Deserializes the feature from a stream.
     * \param[in] stream The source for the deserialization.
     */
    inline void deserialize(std::istream &stream) {
        p1.deserialize(stream);
        p2.deserialize(stream);
        stream.read(reinterpret_cast<char *>(&channel), sizeof(channel));
    }

  public:
    /** \brief First sample point. */
    PointT p1;
    /** \brief Second sample point. */
    PointT p2;

    /** \brief Specifies which channel is used for comparison. */
    unsigned char channel;
};

} // namespace pcl

#endif
