ProductID.h

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#ifndef DataFormats_Provenance_ProductID_h
#define DataFormats_Provenance_ProductID_h
 
/*----------------------------------------------------------------------
  
ProductID: A unique identifier for each WrapperBase within a process.
Used only in Ref, Ptr, and similar classes.
 
The high order 16 bits is the process index, identifying the process
in which the product was created.  Exception: An index of 0 means that
the product was created prior to the new format (i.e. prior to CMSSW_3_0_0.
 
The low order 16 bits is the product index, identifying the product that
in which the product was created.  An index of zero means no product.
 
 
The 
 
----------------------------------------------------------------------*/
 
#include <iosfwd>
 
namespace edm {
 
  typedef unsigned short ProcessIndex;
  typedef unsigned short ProductIndex;
  class ProductID {
  public:
    ProductID() : processIndex_(0), productIndex_(0) {}
    explicit ProductID(ProductIndex prodIndex) : processIndex_(0), productIndex_(prodIndex) {}
    ProductID(ProcessIndex procIndex, ProductIndex prodIndex) : processIndex_(procIndex), productIndex_(prodIndex) {}
    bool isValid() const { return productIndex_ != 0; }
    ProcessIndex processIndex() const { return processIndex_; }
    ProcessIndex productIndex() const { return productIndex_; }
    ProductIndex id() const { return productIndex_; }  // backward compatibility
    void reset() { processIndex_ = productIndex_ = 0; }
 
    void swap(ProductID& other);
 
  private:
    ProcessIndex processIndex_;
    ProductIndex productIndex_;
  };
 
  inline void swap(ProductID& a, ProductID& b) { a.swap(b); }
 
  inline bool operator==(ProductID const& lh, ProductID const& rh) {
    return lh.processIndex() == rh.processIndex() && lh.productIndex() == rh.productIndex();
  }
  inline bool operator!=(ProductID const& lh, ProductID const& rh) { return !(lh == rh); }
 
  bool operator<(ProductID const& lh, ProductID const& rh);
 
  std::ostream& operator<<(std::ostream& os, ProductID const& id);
}  // namespace edm
#endif