59 lines
1.8 KiB
Ada
59 lines
1.8 KiB
Ada
-- Copyright 2012 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;
|