namespace boost {
  namespace icl {
    template<typename SubType, typename DomainT, 
             ICL_COMPARE Compare = ICL_COMPARE_INSTANCE(std::less, DomainT), 
             ICL_INTERVAL(ICL_COMPARE) Interval = ICL_INTERVAL_INSTANCE(ICL_INTERVAL_DEFAULT, DomainT, Compare), 
             ICL_ALLOC Alloc = std::allocator> 
      class interval_base_set;

    template<typename SubType, typename DomainT, ICL_COMPARE Compare, 
             ICL_INTERVAL(ICL_COMPARE) Interval, ICL_ALLOC Alloc> 
      struct is_set<icl::interval_base_set< SubType, DomainT, Compare, Interval, Alloc >>;
    template<typename SubType, typename DomainT, ICL_COMPARE Compare, 
             ICL_INTERVAL(ICL_COMPARE) Interval, ICL_ALLOC Alloc> 
      struct is_interval_container<icl::interval_base_set< SubType, DomainT, Compare, Interval, Alloc >>;
  }
}