static void set_axes (Grob *, Axis, Axis);
static bool has_axis (Grob *, Axis);
static void get_children (Grob *, vector<Grob*> *);
static void set_axes (Grob *, Axis, Axis);
static bool has_axis (Grob *, Axis);
static void get_children (Grob *, vector<Grob*> *);