// In header: <boost/icl/left_open_interval.hpp>
template<typename DomainT, 
         ICL_COMPARE Compare = ICL_COMPARE_INSTANCE(ICL_COMPARE_DEFAULT, DomainT)> 
class left_open_interval {
public:
  // types
  typedef left_open_interval< DomainT, Compare > type;       
  typedef DomainT                                domain_type;
  // construct/copy/destruct
  left_open_interval();
  explicit left_open_interval(const DomainT &);
  left_open_interval(const DomainT &, const DomainT &);
  // public member functions
  typedef ICL_COMPARE_DOMAIN(Compare, DomainT);
  DomainT lower() const;
  DomainT upper() const;
};