ParentageRegistry.h

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#ifndef DataFormats_Provenance_ParentageRegistry_h
#define DataFormats_Provenance_ParentageRegistry_h

#include "tbb/concurrent_unordered_map.h"

#include "DataFormats/Provenance/interface/Parentage.h"
#include "DataFormats/Provenance/interface/ParentageID.h"


// Note that this registry is *not* directly persistable. The contents
// are persisted, but not the container.
namespace edm
{
  class ParentageRegistry {
  public:
    typedef edm::ParentageID   key_type;
    typedef edm::Parentage     value_type;
    
    static ParentageRegistry* instance();
    
    bool getMapped(key_type const& k, value_type& result) const;
    
    value_type const* getMapped(key_type const& k) const;
    
    bool insertMapped(value_type const& v);
    bool insertMapped(value_type&& v);
    
    void clear();

    struct key_hash {
      std::size_t operator()(key_type const& iKey) const{
        return iKey.smallHash();
      }
    };
  private:
    tbb::concurrent_unordered_map<key_type,value_type,key_hash> m_map;
  };

}

#endif