include/Geant4/G4CrossSectionFactoryRegistry.hh

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0025 //
0026 // G4CrossSectionFactoryRegistry class
0027 //
0028 // This class implements a regsitry for cross-section factories
0029 // It can be used to access factories to instantiate cross-section
0030 // datasets on demand. This is intended to be shared among threads
0031 // see G4CrossSectionFactory class: while G4CrossSectionDataSetRegistry
0032 // is per-thread (G4ThreadLocal), this class is shared, so only one instance
0033 // of each factory exists for each application. This is needed because factories
0034 // rely on global variables to register themselves in this registry.
0035 // Note: use of this class is thread-safe.
0036 //
0037 // History:
0038 // 1-Apr-2013: A. Dotti, first implementation
0039 #ifndef G4CROSSSECTIONFACTORYREGISTRY_HH
0040 #define G4CROSSSECTIONFACTORYREGISTRY_HH
0041
0042 #include <ostream>
0043 #include <G4String.hh>
0044 #include <map>
0045
0046 class G4VBaseXSFactory;
0047
0048 class G4CrossSectionFactoryRegistry
0049 {
0050     friend std::ostream& operator<<(std::ostream&, const G4CrossSectionFactoryRegistry&);
0051 private:
0052     std::map<G4String, G4VBaseXSFactory*> factories;
0053     static G4CrossSectionFactoryRegistry* instance; //Note this is shared among threads
0054     G4CrossSectionFactoryRegistry();
0055     G4CrossSectionFactoryRegistry(const G4CrossSectionFactoryRegistry& );
0056     G4CrossSectionFactoryRegistry& operator=(const G4CrossSectionFactoryRegistry&);
0057     //Disable copy-ctr and assignement operator
0058 public:
0059     static G4CrossSectionFactoryRegistry* Instance();
0060     G4VBaseXSFactory* GetFactory( const G4String& name , G4bool abortIfNotFound = true) const;
0061     //Search a cross-section factory by name, by default rise an exception if factory is not found
0062     void Register( const G4String& name , G4VBaseXSFactory* factory );
0063 };
0064
0065 std::ostream&  operator<<(std::ostream& msg, const G4CrossSectionFactoryRegistry& rhs);
0066
0067 #endif // G4CROSSSECTIONFACTORYREGISTRY_HH