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