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template< typename Service> bool has_service( io_service & ios);
        This function is used to determine whether the io_service contains a service object
        corresponding to the given service type.
      
              The io_service
              object that owns the service.
            
        A boolean indicating whether the io_service contains the service.
      
        Header: boost/asio/io_service.hpp
      
        Convenience header: boost/asio.hpp