Gabriele Cosmo
109 lines
3.8 KiB
C++
109 lines
3.8 KiB
C++
//
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// ********************************************************************
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// * License and Disclaimer *
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// * *
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// * The Geant4 software is copyright of the Copyright Holders of *
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// * the Geant4 Collaboration. It is provided under the terms and *
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// * conditions of the Geant4 Software License, included in the file *
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// * LICENSE and available at http://cern.ch/geant4/license . These *
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// * include a list of copyright holders. *
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// * *
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// * Neither the authors of this software system, nor their employing *
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// * institutes,nor the agencies providing financial support for this *
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// * work make any representation or warranty, express or implied, *
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// * regarding this software system or assume any liability for its *
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// * use. Please see the license in the file LICENSE and URL above *
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// * for the full disclaimer and the limitation of liability. *
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// * *
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// * This code implementation is the result of the scientific and *
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// * technical work of the GEANT4 collaboration. *
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// * By using, copying, modifying or distributing the software (or *
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// * any work based on the software) you agree to acknowledge its *
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// * use in resulting scientific publications, and indicate your *
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// * acceptance of all terms of the Geant4 Software license. *
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// ********************************************************************
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//
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//
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// Generic identifier-creator based factory. Based on
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// factory presented in "Modern C++ Design, Andrei Alexandrescu"
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//
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// Jane Tinslay, September 2006
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//
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#ifndef G4CREATORFACTORYT_HH
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#define G4CREATORFACTORYT_HH
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#include "globals.hh"
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#include <map>
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template <typename T, typename Identifier, typename Creator>
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class G4CreatorFactoryT {
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public:
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// Constructor
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G4CreatorFactoryT();
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// Destructor
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virtual ~G4CreatorFactoryT();
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// Register identifier<->creator pairs
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G4bool Register(const Identifier& id, Creator creator);
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// Create product with given identifier
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T* Create(const Identifier& id) const;
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private:
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typedef std::map<Identifier, Creator> Map;
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// Data member
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Map fMap;
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};
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template <typename T, typename Identifier, typename Creator>
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G4CreatorFactoryT<T, Identifier, Creator>::G4CreatorFactoryT() {}
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template <typename T, typename Identifier, typename Creator>
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G4CreatorFactoryT<T, Identifier, Creator>::~G4CreatorFactoryT() {}
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template <typename T, typename Identifier, typename Creator>
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G4bool
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G4CreatorFactoryT<T, Identifier, Creator>::Register(const Identifier& id,
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Creator creator)
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{
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if (fMap.find(id) != fMap.end()) {
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G4ExceptionDescription ed;
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ed << "Creator with identifier "<<id<<" already exists."<<G4endl;
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G4Exception
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("G4CreatorFactoryT::Register(const Identifier& id, Creator creator)",
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"greps0102", JustWarning, ed,
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"Creator exists");
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return false;
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}
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// Insert identifier<->creator pair into map
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std::pair<Identifier, Creator> myPair(id, creator);
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return fMap.insert(myPair).second;
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}
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template <typename T, typename Identifier, typename Creator>
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T*
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G4CreatorFactoryT<T, Identifier, Creator>::Create(const Identifier& id) const
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{
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typename Map::const_iterator iter = fMap.find(id);
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if (iter == fMap.end()) {
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G4ExceptionDescription ed;
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ed << "Identifier "<<id<<" does not exist."<<G4endl;
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G4Exception("G4CreatorFactoryT::Create(const Identifier& id)",
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"greps0103", JustWarning, ed,
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"Non-existent identifier");
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return 0;
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}
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return iter->second();
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}
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#endif
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