Called at the end of an NNTP command. If the command was one that produced a list, on_nntp_line() may have been called before this.
When this is called, the listener can safely clean up anything associated with processing the command.
Reimplemented in pan::NNTP_Pool, pan::TaskArticle, pan::TaskGroups, pan::TaskPost, and pan::TaskXOver.
Definition at line 77 of file nntp.h.