ThinnedAssociation.h

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#ifndef DataFormats_Common_ThinnedAssociation_h
#define DataFormats_Common_ThinnedAssociation_h

#include "DataFormats/Provenance/interface/ProductID.h"

#include <optional>
#include <vector>

namespace edm {

  class ThinnedAssociation {
  public:
    ThinnedAssociation();

    ProductID const& parentCollectionID() const { return parentCollectionID_; }
    ProductID const& thinnedCollectionID() const { return thinnedCollectionID_; }
    std::vector<unsigned int> const& indexesIntoParent() const { return indexesIntoParent_; }

    // If this association contains the parent index, return the
    // corresponding index into the thinned collection. Otherwise
    // return null std::optional.
    std::optional<unsigned int> getThinnedIndex(unsigned int parentIndex) const;

    void setParentCollectionID(ProductID const& v) { parentCollectionID_ = v; }
    void setThinnedCollectionID(ProductID const& v) { thinnedCollectionID_ = v; }
    void push_back(unsigned int index) { indexesIntoParent_.push_back(index); }

  private:
    ProductID parentCollectionID_;
    ProductID thinnedCollectionID_;

    // The size of indexesIntoParent_ is the same as
    // the size of the thinned collection and each
    // element of indexesIntoParent corresponds to the
    // element of the thinned collection at the same position.
    // The values give the index of the corresponding element
    // in the parent collection.
    std::vector<unsigned int> indexesIntoParent_;
  };
}  // namespace edm
#endif