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G4CreatorFactoryT.hh
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26 // $Id: G4CreatorFactoryT.hh 78955 2014-02-05 09:45:46Z gcosmo $
27 //
28 // Generic identifier-creator based factory. Based on
29 // factory presented in "Modern C++ Design, Andrei Alexandrescu"
30 //
31 // Jane Tinslay, September 2006
32 //
33 #ifndef G4CREATORFACTORYT_HH
34 #define G4CREATORFACTORYT_HH
35 
36 #include "globals.hh"
37 #include <map>
38 
39 template <typename T, typename Identifier, typename Creator>
41 
42 public:
43 
44  // Constructor
46 
47  // Destructor
48  virtual ~G4CreatorFactoryT();
49 
50  // Register identifier<->creator pairs
51  G4bool Register(const Identifier& id, Creator creator);
52 
53  // Create product with given identifier
54  T* Create(const Identifier& id) const;
55 
56 private:
57 
58  typedef std::map<Identifier, Creator> Map;
59 
60  // Data member
61  Map fMap;
62 
63 };
64 
65 template <typename T, typename Identifier, typename Creator>
67 
68 template <typename T, typename Identifier, typename Creator>
70 
71 template <typename T, typename Identifier, typename Creator>
72 G4bool
74  Creator creator)
75 {
76  if (fMap.find(id) != fMap.end()) {
78  ed << "Creator with identifier "<<id<<" already exists."<<G4endl;
80  ("G4CreatorFactoryT::Register(const Identifier& id, Creator creator)",
81  "greps0102", JustWarning, ed,
82  "Creator exists");
83  return false;
84  }
85 
86  // Insert identifier<->creator pair into map
87  std::pair<Identifier, Creator> myPair(id, creator);
88  return fMap.insert(myPair).second;
89 }
90 
91 template <typename T, typename Identifier, typename Creator>
92 T*
94 {
95  typename Map::const_iterator iter = fMap.find(id);
96 
97  if (iter == fMap.end()) {
99  ed << "Identifier "<<id<<" does not exist."<<G4endl;
100  G4Exception("G4CreatorFactoryT::Create(const Identifier& id)",
101  "greps0103", JustWarning, ed,
102  "Non-existent identifier");
103  return 0;
104  }
105 
106  return iter->second();
107 }
108 
109 #endif
std::ostringstream G4ExceptionDescription
Definition: globals.hh:76
virtual ~G4CreatorFactoryT()
bool G4bool
Definition: G4Types.hh:79
void G4Exception(const char *originOfException, const char *exceptionCode, G4ExceptionSeverity severity, const char *comments)
Definition: G4Exception.cc:41
G4bool Register(const Identifier &id, Creator creator)
#define G4endl
Definition: G4ios.hh:61
T * Create(const Identifier &id) const