Boost C++ Libraries

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Header <boost/icl/rational.hpp>

namespace boost {
  namespace icl {
    template<typename Integral> struct is_numeric<boost::rational< Integral >>;
    template<typename Integral> 
      struct is_continuous<boost::rational< Integral >>;
    template<typename Integral> struct is_discrete<boost::rational< Integral >>;
    template<typename Integral> struct has_inverse<boost::rational< Integral >>;
  }
}