RColumnModel.hxx

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/// \file ROOT/RColumnModel.hxx
/// \ingroup NTuple ROOT7
/// \author Jakob Blomer <jblomer@cern.ch>
/// \date 2018-10-09
/// \warning This is part of the ROOT 7 prototype! It will change without notice. It might trigger earthquakes. Feedback
/// is welcome!
 
/*************************************************************************
 * Copyright (C) 1995-2019, Rene Brun and Fons Rademakers.               *
 * All rights reserved.                                                  *
 *                                                                       *
 * For the licensing terms see $ROOTSYS/LICENSE.                         *
 * For the list of contributors see $ROOTSYS/README/CREDITS.             *
 *************************************************************************/
 
#ifndef ROOT7_RColumnModel
#define ROOT7_RColumnModel
 
#include <ROOT/RStringView.hxx>
 
#include <string>
 
namespace ROOT {
namespace Experimental {
 
// clang-format off
/**
\class ROOT::Experimental::EColumnType
\ingroup NTuple
\brief The available trivial, native content types of a column
 
More complex types, such as classes, get translated into columns of such simple types by the RField.
New types need to be accounted for in RColumnElementBase::Generate() and RColumnElementBase::GetBitsOnStorage(), too.
*/
// clang-format on
enum class EColumnType {
   kUnknown = 0,
   // type for root columns of (nested) collections; 32bit integers that count relative to the current cluster
   kIndex,
   // 64 bit column that uses the lower 32bits as kIndex and the higher 32bits as a dispatch tag; used, e.g.,
   // in order to serialize std::variant
   kSwitch,
   kByte,
   kChar,
   kBit,
   kReal64,
   kReal32,
   kReal16,
   kInt64,
   kInt32,
   kInt16,
   kInt8,
   kMax,
};
 
// clang-format off
/**
\class ROOT::Experimental::RColumnModel
\ingroup NTuple
\brief Holds the static meta-data of a column in a tree
*/
// clang-format on
class RColumnModel {
private:
   EColumnType fType;
   bool fIsSorted;
 
public:
   RColumnModel() : fType(EColumnType::kUnknown), fIsSorted(false) {}
   RColumnModel(EColumnType type, bool isSorted) : fType(type), fIsSorted(isSorted) {}
 
   EColumnType GetType() const { return fType; }
   bool GetIsSorted() const { return fIsSorted; }
 
   bool operator ==(const RColumnModel &other) const {
      return (fType == other.fType) && (fIsSorted == other.fIsSorted);
   }
};
 
} // namespace Experimental
} // namespace ROOT
 
#endif