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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 #define G4_DECLARE_PHYSCONSTR_FACTORY(physics_constructor) \
60  const G4PhysicsConstructorFactory<physics_constructor>& physics_constructor##Factory = G4PhysicsConstructorFactory<physics_constructor>(#physics_constructor)
61 
62 // support for phys constructors defined within a namespace
63 // a bit tricky due to cpp macro expansion and the use of "::"
64 // use G4_DECLARE_PHYSCONSTR_FACTORY_NS( myns::MyProc, myns, MyProc );
65 #define G4_DECLARE_PHYSCONSTR_FACTORY_NS( physics_constructor, nsname, pcbase ) \
66  namespace nsname { \
67  const G4PhysicsConstructorFactory<physics_constructor>& pcbase##Factory = G4PhysicsConstructorFactory<physics_constructor>(#physics_constructor); \
68  } \
69  typedef int xyzzy__LINE__
70  // eat trailing semicolon using silly typedef
71 
72 // REFERENCE (rather than DECLARE) when the physics constructor if it is part
73 // of a static library. No need to include the header (DECLARE needs this
74 // to build the code), we just need to make a reference in order to pull
75 // the compilation unit static variable from the library and cause it
76 // to be initialized (and thus self-register)
77 
78 // Use REGREF to allow cases where REFERENCE macro is used twice
79 #ifndef REGREF
80  #define REGREF 0
81 #endif
82 
83 #define G4_REFERENCE_PHYSCONSTR_FACTORY(physics_constructor) \
84  class physics_constructor; \
85  extern const G4PhysicsConstructorFactory<physics_constructor>& physics_constructor##Factory; \
86  const G4PhysicsConstructorFactory<physics_constructor>& physics_constructor##FactoryRef##REGREF = physics_constructor##Factory
87 
88 #define G4_REFERENCE_PHYSCONSTR_FACTORY_NS( physics_constructor, nsname, pcbase ) \
89  namespace nsname { \
90  class pcbase; \
91  extern const G4PhysicsConstructorFactory<physics_constructor>& pcbase##Factory; \
92  const G4PhysicsConstructorFactory<physics_constructor>& pcbase##FactoryRef##REGREF = pcbase##Factory; \
93  } \
94  typedef int xyzzy__LINE__
95  // eat trailing semicolon using silly typedef
96 
97 #endif
const XML_Char * name
Definition: expat.h:151
G4PhysicsConstructorFactory(const G4String &name)
void AddFactory(G4String, G4VBasePhysConstrFactory *)
static G4PhysicsConstructorRegistry * Instance()
virtual G4VPhysicsConstructor * Instantiate()
virtual G4VPhysicsConstructor * Instantiate()=0