FileID.h

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#ifndef DataFormats_Provenance_FileID_h
#define DataFormats_Provenance_FileID_h
 
/*----------------------------------------------------------------------
 
Holds a unique file identifier in string form.
 
----------------------------------------------------------------------*/
 
#include <string>
 
namespace edm {
 
  class FileID {
  public:
    FileID() : fid_() {}
    explicit FileID(std::string const& id) : fid_(id) {}
    bool isValid() const { return !fid().empty(); }
    std::string const& fid() const { return fid_; }
 
  private:
    std::string fid_;
  };
 
  inline bool operator==(FileID const& lh, FileID const& rh) { return lh.fid() == rh.fid(); }
 
  inline bool operator!=(FileID const& lh, FileID const& rh) { return !(lh == rh); }
 
  std::ostream& operator<<(std::ostream& os, FileID const& id);
}  // namespace edm
#endif