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#ifndef _FF_FACTORY_H_
#define _FF_FACTORY_H_
#include <iostream>
#include <string>
#include <map>
#include <boost/shared_ptr.hpp>
class FeatureFunction;
class FFRegistry;
class FFFactoryBase;
extern boost::shared_ptr<FFRegistry> global_ff_registry;
class FFRegistry {
friend int main(int argc, char** argv);
friend class FFFactoryBase;
public:
boost::shared_ptr<FeatureFunction> Create(const std::string& ffname, const std::string& param) const;
void DisplayList() const;
void Register(const std::string& ffname, FFFactoryBase* factory);
private:
FFRegistry() {}
std::map<std::string, boost::shared_ptr<FFFactoryBase> > reg_;
};
struct FFFactoryBase {
virtual ~FFFactoryBase();
virtual boost::shared_ptr<FeatureFunction> Create(const std::string& param) const = 0;
};
template<class FF>
class FFFactory : public FFFactoryBase {
boost::shared_ptr<FeatureFunction> Create(const std::string& param) const {
return boost::shared_ptr<FeatureFunction>(new FF(param));
}
};
#endif
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