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Determine if an io_service contains a specified
          service type.
        
template< typename Service> friend 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