-- File:	Plate_D1.cdl
-- Created:	Thu Oct 19 17:38:21 1995
-- Author:	Andre LIEUTIER
--		<ds@sgi63>
---Copyright:	 Matra Datavision 1995
--           	 
class D1 from Plate
---Purpose : define an order 1 derivatives of a 3d valued
--          function of a 2d variable
--         

uses XYZ from gp

is
    Create(du,dv : XYZ from gp) returns D1;
    Create(ref  :  D1  from  Plate) returns D1;
    -- Accessors :
    DU(me)  returns  XYZ  from  gp;
    ---C++: inline 
    ---C++: return const &
    DV(me)  returns  XYZ  from  gp;
    ---C++: inline 
    ---C++: return const &

fields
    
    Du, Dv : XYZ from gp;

friends
    class GtoCConstraint from Plate,
    class FreeGtoCConstraint from Plate
end;