| Geant4 Cross Reference |
1 //
2 // ********************************************************************
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4 // * *
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24 // ********************************************************************
25 //
26 #ifndef G4PhysicsConstructorFactory_h
27 #define G4PhysicsConstructorFactory_h 1
28
29
30 #include "globals.hh"
31 #include "G4PhysicsConstructorRegistry.hh"
32 #include "G4VPhysicsConstructor.hh"
33
34 class G4VBasePhysConstrFactory
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
48 G4PhysicsConstructorFactory(const G4String& name)
49 {
50 G4PhysicsConstructorRegistry::Instance()->AddFactory(name, this);
51 }
52
53 virtual G4VPhysicsConstructor* Instantiate()
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
98