---

factory.h

Go to the documentation of this file.

#ifndef fl_factory_h
#define fl_factory_h


#include <string>
#include <map>


namespace fl
{
  template<class B>
  class Factory
  {
  public:
        typedef B * productFunction (std::istream & stream);
        typedef std::map<std::string, productFunction *> productMap;

        static B * read (std::istream & stream)
        {
          std::string name;
          getline (stream, name);
          typename productMap::iterator entry = products.find (name);
          if (entry == products.end ())
          {
                std::string error = "Unknown class name in stream: ";
                error += name;
                throw error.c_str ();
          }
          return (*entry->second) (stream);
        }

        static productMap products;
  };

  template<class B, class C>
  class Product
  {
  public:
        static B * read (std::istream & stream)
        {
          return new C (stream);
        }
        static void add ()
        {
          Factory<B>::products.insert (make_pair (typeid (C).name (), &read));
        }
  };
}


#endif

---