| Geant4 Cross Reference |
1 //
2 // ********************************************************************
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4 // * *
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24 // ********************************************************************
25 //
26 // ---------------------------------------------------------------
27 // GEANT4 template class header
28 // Class Description:
29 // This class delegates which singletons a task references
30 // ---------------------------------------------------------------
31 // Author: Jonathan Madsen
32 // ---------------------------------------------------------------
33
34 #include "G4AutoLock.hh"
35 #include "G4Threading.hh"
36
37 #include <functional>
38 #include <map>
39 #include <memory>
40 #include <set>
41 #include <thread>
42 #include <tuple>
43 #include <type_traits>
44 #include <vector>
45
46 namespace G4Traits
47 {
48 template <typename T>
49 struct TaskSingletonKey
50 {
51 using type = G4int;
52 using compare_type = std::less<type>;
53 };
54 } // namespace G4Traits
55
56 //----------------------------------------------------------------------------//
57
58 /// \class G4TaskSingletonEvaluator
59 /// \brief This structure must be specialized and use overloads to the
60 /// constructor
61 ///
62 template <typename T>
63 struct G4TaskSingletonEvaluator;
64
65 //----------------------------------------------------------------------------//
66
67 template <typename T>
68 class G4TaskSingletonDelegator;
69
70 //----------------------------------------------------------------------------//
71
72 template <typename T>
73 class G4TaskSingletonData
74 {
75 using key_type = typename G4Traits::TaskSingletonKey<T>::type;
76 using compare_type = typename G4Traits::TaskSingletonKey<T>::compare_type;
77
78 friend struct G4TaskSingletonEvaluator<T>;
79 friend class G4TaskSingletonDelegator<T>;
80 using this_type = G4TaskSingletonData<T>;
81
82 private:
83 static std::unique_ptr<this_type>& GetInstance()
84 {
85 static auto _instance = std::unique_ptr<this_type>(new this_type);
86 return _instance;
87 }
88
89 private:
90 std::map<key_type, T*, compare_type> m_data;
91 };
92
93 //----------------------------------------------------------------------------//
94
95 template <typename T>
96 struct G4TaskSingletonEvaluator
97 {
98 using key_type = typename G4Traits::TaskSingletonKey<T>::type;
99 using data_type = G4TaskSingletonData<T>;
100
101 template <typename... Args>
102 G4TaskSingletonEvaluator(key_type&, Args&&...)
103 {
104 throw std::runtime_error("Not specialized!");
105 }
106 };
107
108 //----------------------------------------------------------------------------//
109
110 template <typename T>
111 class G4TaskSingletonDelegator
112 {
113 public:
114 using pointer = T*;
115 using evaluator_type = G4TaskSingletonEvaluator<T>;
116 using data_type = G4TaskSingletonData<T>;
117 using key_type = typename G4Traits::TaskSingletonKey<T>;
118
119 template <typename... Args>
120 static void Configure(Args&&... args)
121 {
122 auto& _data = data_type::GetInstance();
123 evaluator_type _eval(std::forward<Args>(args)...);
124 auto _ptr = _data->m_data.at(_eval.index);
125 _eval.modifier(_ptr);
126 T::SetInstance(_data->m_data.at(_key));
127 }
128 };
129
130 //----------------------------------------------------------------------------//
131