Method is_bottom

src/FactPointTo.h:81–81

	// lattice functions
	virtual bool is_top(void) const { return point_to_vars.empty();}
	virtual bool is_bottom(void) const { return false;} // there is no bottom, we just grow the points-to set
	virtual void set_top(void) { point_to_vars.clear();}
	virtual void set_bottom(void) {};