59 lines
1.8 KiB
Ada
59 lines
1.8 KiB
Ada
-- Copyright 2012-2015 Free Software Foundation, Inc.
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--
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-- This program is free software; you can redistribute it and/or modify
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-- it under the terms of the GNU General Public License as published by
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-- the Free Software Foundation; either version 3 of the License, or
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-- (at your option) any later version.
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--
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-- This program is distributed in the hope that it will be useful,
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-- but WITHOUT ANY WARRANTY; without even the implied warranty of
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-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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-- GNU General Public License for more details.
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--
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-- You should have received a copy of the GNU General Public License
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-- along with this program. If not, see <http://www.gnu.org/licenses/>.
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package Classes is
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type Point is record
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X : Integer;
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Y : Integer;
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end record;
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type Shape is abstract tagged null record;
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type Shape_Access is access all Shape'Class;
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type Drawable is interface;
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type Drawable_Access is access all Drawable'Class;
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procedure Draw (D : Drawable) is abstract;
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type Circle is new Shape and Drawable with record
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Center : Point;
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Radius : Natural;
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end record;
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procedure Draw (R : Circle);
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My_Circle : Circle := ((1, 2), 3);
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My_Shape : Shape'Class := Shape'Class (My_Circle);
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My_Drawable : Drawable'Class := Drawable'Class (My_Circle);
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S_Access : Shape_Access := new Circle'(My_Circle);
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D_Access : Drawable_Access := new Circle'(My_Circle);
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type R (MS : Shape_Access; MD : Drawable_Access) is record
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E : Integer;
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end record;
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MR : R := (MS => S_Access, MD => D_Access, E => 42);
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type Shape_Array is array (1 .. 4) of Shape_Access;
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type Drawable_Array is array (1 .. 4) of Drawable_Access;
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S_Array : Shape_Array := (others => S_Access);
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D_Array : Drawable_Array := (others => D_Access);
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end Classes;
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