mapnik/plugins/input/templates/helloworld/hello_featureset.hpp

#ifndef HELLO_FEATURESET_HPP
#define HELLO_FEATURESET_HPP

// mapnik
#include <mapnik/datasource.hpp>

// boost
#include <boost/scoped_ptr.hpp> // needed for wrapping the transcoder

// extend the mapnik::Featureset defined in include/mapnik/datasource.hpp
class hello_featureset : public mapnik::Featureset
{
   public:
      // this constructor can have any arguments you need
      hello_featureset(mapnik::box2d<double> const& box, std::string const& encoding);
      
      // desctructor
      virtual ~hello_featureset();
      
      // mandatory: you must expose a next() method, called when rendering
      mapnik::feature_ptr next();
   
   private:
      // members are up to you, but these are recommended
      mapnik::box2d<double> const& box_;
      mutable int feature_id_;
      boost::scoped_ptr<mapnik::transcoder> tr_;
};

#endif // HELLO_FEATURESET_HPP