Geant4_10
G4CreatorFactoryT.hh
Go to the documentation of this file.
1 //
2 // ********************************************************************
3 // * License and Disclaimer *
4 // * *
5 // * The Geant4 software is copyright of the Copyright Holders of *
6 // * the Geant4 Collaboration. It is provided under the terms and *
7 // * conditions of the Geant4 Software License, included in the file *
8 // * LICENSE and available at http://cern.ch/geant4/license . These *
9 // * include a list of copyright holders. *
10 // * *
11 // * Neither the authors of this software system, nor their employing *
12 // * institutes,nor the agencies providing financial support for this *
13 // * work make any representation or warranty, express or implied, *
14 // * regarding this software system or assume any liability for its *
15 // * use. Please see the license in the file LICENSE and URL above *
16 // * for the full disclaimer and the limitation of liability. *
17 // * *
18 // * This code implementation is the result of the scientific and *
19 // * technical work of the GEANT4 collaboration. *
20 // * By using, copying, modifying or distributing the software (or *
21 // * any work based on the software) you agree to acknowledge its *
22 // * use in resulting scientific publications, and indicate your *
23 // * acceptance of all terms of the Geant4 Software license. *
24 // ********************************************************************
25 //
26 // $Id: G4CreatorFactoryT.hh 66376 2012-12-18 09:42:59Z 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