#include <Standard_Boolean.hxx>
#include <GeomAbs_Shape.hxx>
#include <Standard_Integer.hxx>
-class Standard_RangeError;
-class Standard_NoSuchObject;
-class Geom2d_UndefinedDerivative;
-class Geom2d_UndefinedValue;
class gp_Trsf2d;
class gp_Pnt2d;
class gp_Vec2d;