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CdbNTupleIsLessComparator.hh

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#ifndef CDB_NTUPLE_IS_LESS_COMPARATOR_HH
#define CDB_NTUPLE_IS_LESS_COMPARATOR_HH

// File and Version Information:
//      $Id: CdbNTupleIsLessComparator.hh,v 1.1 2004/03/16 19:22:43 gapon Exp $

#include "CdbBase/CdbCommon.hh"

#include <vector>

/// An abstract base class for the "isLess" comparator of two rows in an n-tuple.
/**
  * This class provides a base interface for actual implementations of the comparision
  * operation carrying a user defined semantics.
  *
  * NOTE: Although the number of columns parameter is not directly used in this
  *       interface it's still requires as it may be used in actual implementation
  *       of the comparision operation. This will also enforce using the right
  *       comparator class matching the n-tuple with the same signature.
  *
  * @see class CdbNTuple
  */
template < class T, unsigned int NCOL >
class CdbNTupleIsLessComparator {

public:

  /// The destructor
  /**
    * Just to enforce the virtual destructor.
    */
    virtual ~CdbNTupleIsLessComparator( );

  /// Compare two rows
  /**
    * This method has to be implemented by a subclass.
    *
    * The method will return "true" if "theLeftRow" is strictly less than "theRightRow".
    */
    virtual bool isLess( const std::vector<T>& theLeftRow,
                         const std::vector<T>& theRightRow ) const = 0;
};

#ifdef     BABAR_COMP_INST
#include "CdbTable/CdbNTupleIsLessComparator.cc"
#endif  // BABAR_COMP_INST

#endif // CDB_NTUPLE_IS_LESS_COMPARATOR_HH

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