id_iterator.hpp

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#ifndef ID_ITERATOR_HPP_
#define ID_ITERATOR_HPP_
#include "boost/iterator/iterator_facade.hpp"
#include "boost/range.hpp"

namespace vdj_pipe{

template<class Id> class Id_iterator
         : public boost::iterator_facade<
              Id_iterator<Id>, Id, boost::forward_traversal_tag, Id
           > {

   friend class boost::iterator_core_access;
public:
   typedef Id_iterator self_type;
   Id_iterator() : id_() {}
   Id_iterator(const Id id) : id_(id) {}

private:
   Id id_;
   Id dereference() const {return id_;}
   void increment() {++id_.val_;}
   bool equal(self_type const& i) const {return i.id_ == id_;}
   typename self_type::difference_type distance_to(self_type const& i) const {
      return id_() - i.id_();
   }
};

template<class Id> inline boost::iterator_range<Id_iterator<Id> >
id_range(const Id id1, const Id id2) {
   typedef Id_iterator<Id> iter_t;
   return boost::iterator_range<Id_iterator<Id> >(iter_t(id1), iter_t(id2));
}

}//namespace vdj_pipe
#endif /* ID_ITERATOR_HPP_ */