int get_rank () const { return rank_; }
void set_rank (int);
DECLARE_SCHEME_CALLBACK (print, (SCM));
DECLARE_SCHEME_CALLBACK (before_line_breaking, (SCM));
int get_rank () const { return rank_; }
void set_rank (int);
DECLARE_SCHEME_CALLBACK (print, (SCM));
DECLARE_SCHEME_CALLBACK (before_line_breaking, (SCM));