Geant4  10.03.p03
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G4PhysicsConstructorFactory.hh
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26 #ifndef G4PhysicsConstructorFactory_h
27 #define G4PhysicsConstructorFactory_h 1
28 
29 
30 #include "globals.hh"
32 #include "G4VPhysicsConstructor.hh"
33 
35 {
36 
37 public:
38 
39  virtual G4VPhysicsConstructor* Instantiate() = 0;
40 
41 };
42 
43 
44 template <typename T> class G4PhysicsConstructorFactory : public G4VBasePhysConstrFactory
45 {
46 public:
47 
49  {
51  }
52 
54  {
55  return new T();
56  }
57 };
58 
59 
60 #define G4_DECLARE_PHYSCONSTR_FACTORY(physics_constructor) \
61  const G4PhysicsConstructorFactory<physics_constructor>& physics_constructor##Factory = G4PhysicsConstructorFactory<physics_constructor>(#physics_constructor)
62 
63 // support for phys constructors defined within a namespace
64 // a bit tricky due to cpp macro expansion and the use of "::"
65 // use G4_DECLARE_PHYSCONSTR_FACTORY_NS( myns::MyProc, myns, MyProc );
66 #define G4_DECLARE_PHYSCONSTR_FACTORY_NS( physics_constructor, nsname, pcbase ) \
67  namespace nsname { \
68  const G4PhysicsConstructorFactory<physics_constructor>& pcbase##Factory = G4PhysicsConstructorFactory<physics_constructor>(#physics_constructor); \
69  } \
70  typedef int xyzzy__LINE__
71  // eat trailing semicolon using silly typedef
72 
73 // REFERENCE (rather than DECLARE) when the physics constructor if it is part
74 // of a static library. No need to include the header (DECLARE needs this
75 // to build the code), we just need to make a reference in order to pull
76 // the compilation unit static variable from the library and cause it
77 // to be initialized (and thus self-register)
78 
79 #define G4_REFERENCE_PHYSCONSTR_FACTORY(physics_constructor) \
80  class physics_constructor; \
81  extern const G4PhysicsConstructorFactory<physics_constructor>& physics_constructor##Factory; \
82  const G4PhysicsConstructorFactory<physics_constructor>& physics_constructor##FactoryRef = physics_constructor##Factory
83 
84 #define G4_REFERENCE_PHYSCONSTR_FACTORY_NS( physics_constructor, nsname, pcbase ) \
85  namespace nsname { \
86  class pcbase; \
87  extern const G4PhysicsConstructorFactory<physics_constructor>& pcbase##Factory; \
88  const G4PhysicsConstructorFactory<physics_constructor>& pcbase##FactoryRef = pcbase##Factory; \
89  } \
90  typedef int xyzzy__LINE__
91  // eat trailing semicolon using silly typedef
92 
93 #endif
const XML_Char * name
Definition: expat.h:151
virtual G4VPhysicsConstructor * Instantiate()=0
virtual G4VPhysicsConstructor * Instantiate()
void AddFactory(G4String, G4VBasePhysConstrFactory *)
static G4PhysicsConstructorRegistry * Instance()
G4PhysicsConstructorFactory(const G4String &name)