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/usr/lib/R/site-library/dplyr/include/dplyr/FullDataFrame.h is in r-cran-dplyr 0.7.4-3.

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#ifndef dplyr_tools_FullDataFrame_H
#define dplyr_tools_FullDataFrame_H

namespace dplyr {

class FullDataFrame {
public:
  typedef NaturalSlicingIndex slicing_index;

  FullDataFrame(const DataFrame& data_) : index(data_.nrows()) {}

  const SlicingIndex& get_index() const {
    return index;
  }

  inline int nrows() const {
    return index.size();
  }

private:
  NaturalSlicingIndex index;
};

}
#endif