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template< typename Service> 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