#include <string>
class Object {
public:
virtual std::string ToString() const = 0;
virtual ~Object() {}
};
class Child : public Object {
public:
explicit Child(const std::string& class_id)
: id_(class_id) {}
Child() {}
std::string ToString() const override {
return id_;
}
private:
std::string id_;
};
class Factory {
public:
Object* Create(const std::string& class_id) {
return new Child(class_id);
}
void Register(const std::string& class_id, Object*(*instance_creator)()) {
}
};