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Add a service object to the io_service.
        
template< typename Service> friend void add_service( io_service & ios, Service * svc);
          This function is used to add a service to the io_service.
        
                The io_service
                object that owns the service.
              
                The service object. On success, ownership of the service object is
                transferred to the io_service. When the io_service
                object is destroyed, it will destroy the service object by performing:
delete static_cast<io_service::service*>(svc)
                Thrown if a service of the given type is already present in the
                io_service.
              
                Thrown if the service's owning io_service is not the io_service
                object specified by the ios parameter.
              
          Header: asio/io_service.hpp
        
          Convenience header: asio.hpp