|  | 
Obtain the service object corresponding to the given type.
template< typename Service> friend Service & use_service( io_service & ios);
          This function is used to locate a service object that corresponds to the
          given service type. If there is no existing implementation of the service,
          then the io_service
          will create a new instance of the service.
        
                The io_service
                object that owns the service.
              
The service interface implementing the specified service type. Ownership of the service interface is not transferred to the caller.
          Header: asio/io_service.hpp
        
          Convenience header: asio.hpp