Dario Sassi
77 lines
2.7 KiB
C++
77 lines
2.7 KiB
C++
//----------------------------------------------------------------------------
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// EgalS
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//----------------------------------------------------------------------------
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// File : GeoObjFactory.h Data : 13.10.13 Versione : 1.2a3
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// Contenuto : Factory della classe CGeoObj.
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//
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//
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//
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// Modifiche : 13.10.13 DS Creazione modulo.
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//
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//
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//----------------------------------------------------------------------------
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#pragma once
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#include <string>
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#include <unordered_map>
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#include "/EgtDev/Include/EGkGeoObj.h"
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//----------------------------------------------------------------------------
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#define GEOOBJ_REGISTER( sKey, T) static const bool bReg_##T = GeoObjRegister<class T>::DoRegister( sKey)
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#define GEOOBJ_GETKEY( T) GeoObjRegister<class T>::GetKey()
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#define GEOOBJ_CREATE( sKey) GeoObjFactory::Create( sKey)
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//----------------------------------------------------------------------------
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template <class T>
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class GeoObjRegister
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{
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public :
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static bool DoRegister( std::string sKey)
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{ if ( ! GeoObjFactory::Register( sKey, Create))
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return false ;
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GetKeyPrivate() = sKey ;
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return true ; }
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static IGeoObj* Create( void)
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{ return new(nothrow) T ; }
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static const std::string& GetKey( void)
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{ return GetKeyPrivate() ; }
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private :
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GeoObjRegister( void) {}
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~GeoObjRegister( void) {}
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static std::string& GetKeyPrivate( void)
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{ static std::string s_sKey ;
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return s_sKey ; }
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} ;
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//----------------------------------------------------------------------------
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class GeoObjFactory
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{
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public :
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// definizione del tipo funzione di creazione
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typedef IGeoObj* ( *GeoCreator) ( void) ;
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// per registrare le funzioni di creazione
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static bool Register( std::string sKey, GeoCreator Creator)
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{ return GetCreatorMap().insert( std::pair< std::string, GeoCreator>( sKey, Creator)).second ; }
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// per creare l'oggetto richiesto
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static IGeoObj* Create( std::string sKey)
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{ CreatorMap::iterator Iter = GetCreatorMap().find( sKey) ;
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if ( Iter != GetCreatorMap().end()) {
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if ( Iter->second != nullptr)
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return Iter->second() ;
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}
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return nullptr ; }
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private :
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GeoObjFactory( void) {}
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~GeoObjFactory( void) {}
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// definizione del tipo mappa con coppie nome, funzione di creazione
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typedef std::unordered_map<std::string, GeoCreator> CreatorMap ;
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//
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static CreatorMap& GetCreatorMap( void)
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{ static CreatorMap s_CreatorMap ;
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return s_CreatorMap ; }
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} ;
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