Constructable.h

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#ifndef Protium_Constructable_h_
#define Protium_Constructable_h_

#include <map>
#include <string>

namespace Protium{
    namespace Design{

        struct ConstructablePrototype{
            ConstructablePrototype(){}
            virtual ~ConstructablePrototype(){}
        };

        template<class Group>
        struct VirtualFactory{
            typedef std::map< std::string, ConstructablePrototype*(*)() > map_type;
        

            static ConstructablePrototype* createInstance(const std::string& s, ConstructablePrototype*(*creator)()=0 ){
                map_type::iterator it = getMap()->find(s);
                if( it==getMap()->end() ){
                    return NULL;
                }
                return it->second();
            }
        protected:
            static map_type* getMap(){
                static map_type* map = new map_type();
                return map;
            }
        };

        template<class T, class Group>
        struct DerivedRegister : VirtualFactory<Group>{
            static ConstructablePrototype* create() {return (new T()); }
            DerivedRegister(const std::string& s ){
                getMap->insert(std::make_pair(s, &create) );
            }

        };
    }
}

#define REGISTER_DEC_TYPE(NAME) \
    static Protium::Design::DerivedRegister<NAME> reg;

#define REGISTER_DEF_TYPE(NAME) \
    Protium::Design::DerivedRegister<NAME> NAME::reg(#NAME);

#endif //File Guardian