/**
 * @file binary_numeric_split_info.hpp
 * @author Ryan Curtin
 *
 * After a binary numeric split has been made, this holds information on the
 * split (just the split point).
 *
 * mlpack is free software; you may redistribute it and/or modify it under the
 * terms of the 3-clause BSD license.  You should have received a copy of the
 * 3-clause BSD license along with mlpack.  If not, see
 * http://www.opensource.org/licenses/BSD-3-Clause for more information.
 */
#ifndef MLPACK_METHODS_HOEFFDING_TREES_BINARY_NUMERIC_SPLIT_INFO_HPP
#define MLPACK_METHODS_HOEFFDING_TREES_BINARY_NUMERIC_SPLIT_INFO_HPP

#include <mlpack/prereqs.hpp>

namespace mlpack {
namespace tree {

template<typename ObservationType = double>
class BinaryNumericSplitInfo
{
 public:
  BinaryNumericSplitInfo() { /* Nothing to do. */ }
  BinaryNumericSplitInfo(const ObservationType& splitPoint) :
      splitPoint(splitPoint) { /* Nothing to do. */ }

  template<typename eT>
  size_t CalculateDirection(const eT& value) const
  {
    return (value < splitPoint) ? 0 : 1;
  }

  //! Serialize the split (save/load the split points).
  template<typename Archive>
  void serialize(Archive& ar, const unsigned int /* version */)
  {
    ar & BOOST_SERIALIZATION_NVP(splitPoint);
  }

 private:
  ObservationType splitPoint;
};

} // namespace tree
} // namespace mlpack

#endif