// VirtualEventDataset.h

#ifndef dset__VirtualEventDataset_H
#define dset__VirtualEventDataset_H

// David Adams
// Novenber 2003
// Updated October 2004.
//
// Virtual dataset (empty location) holding content with events.
// different events.
//

#include <iosfwd>
#include "dataset_base/GenericDataset.h"

namespace dset {

class VirtualEventDataset : public GenericDataset {

public:  // Constructors, destructor.

  // Default constructor. Dataset is invalid.
  VirtualEventDataset();

  // Constructor from content (with events).
  // The content must hold a single block.
  explicit VirtualEventDataset(const Content& con);

  // Constructor from another dataset. The location is dropped.
  // If the input full type is VirtualEventDataset, then the parent is
  // copied from that dataset (this ie expecteed for promotion).
  // Otherwise the input is left unassigned.
  explicit VirtualEventDataset(const Dataset& dst);

  // Constructor for promotion.
  // We cannot use the usual ctor(constGenericDataset&) because it
  // conflicts with the previous.
  VirtualEventDataset(const GenericDataset& pdst, int dummy);

public:  // inherited interface

  // Merge.
  // Argument must be of the same type and have the same content
  // and a non-overlapping set of events.
  int merge(const Dataset& dst, std::string ="");

};

}  // end namespace dset

#endif