| -- Copyright 2012-2016 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; |