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-- Copyright 2012-2017 Free Software Foundation, Inc.
--
-- This program is free software; you can redistribute it and/or modify
-- it under the terms of the GNU General Public License as published by
-- the Free Software Foundation; either version 3 of the License, or
-- (at your option) any later version.
--
-- This program is distributed in the hope that it will be useful,
-- but WITHOUT ANY WARRANTY; without even the implied warranty of
-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-- GNU General Public License for more details.
--
-- You should have received a copy of the GNU General Public License
-- along with this program. If not, see <http://www.gnu.org/licenses/>.
package Classes is
type Point is record
X : Integer;
Y : Integer;
end record;
type Shape is abstract tagged null record;
type Shape_Access is access all Shape'Class;
type Drawable is interface;
type Drawable_Access is access all Drawable'Class;
procedure Draw (D : Drawable) is abstract;
type Circle is new Shape and Drawable with record
Center : Point;
Radius : Natural;
end record;
procedure Draw (R : Circle);
My_Circle : Circle := ((1, 2), 3);
My_Shape : Shape'Class := Shape'Class (My_Circle);
My_Drawable : Drawable'Class := Drawable'Class (My_Circle);
S_Access : Shape_Access := new Circle'(My_Circle);
D_Access : Drawable_Access := new Circle'(My_Circle);
type R (MS : Shape_Access; MD : Drawable_Access) is record
E : Integer;
end record;
MR : R := (MS => S_Access, MD => D_Access, E => 42);
type Shape_Array is array (1 .. 4) of Shape_Access;
type Drawable_Array is array (1 .. 4) of Drawable_Access;
S_Array : Shape_Array := (others => S_Access);
D_Array : Drawable_Array := (others => D_Access);
end Classes;
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