42 lines
824 B
ObjectPascal
42 lines
824 B
ObjectPascal
// Èëëþñòðàöèÿ èñïîëüçîâàíèÿ èíòåðôåéñîâ
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type
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IShape = interface
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procedure Draw;
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property X: integer read;
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property Y: integer read;
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end;
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ICloneable = interface
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function Clone: Object;
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end;
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Point = class(IShape,ICloneable)
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private
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xx,yy: integer;
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public
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constructor Create(x,y: integer);
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begin
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xx := x; yy := y;
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end;
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procedure Draw; begin end;
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property X: integer read xx;
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property Y: integer read yy;
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function Clone: Object;
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begin
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Result := new Point(xx,yy);
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end;
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end;
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var
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p: Point := new Point(2,3);
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ish: IShape := p;
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icl: ICloneable := p;
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begin
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writeln(ish.X,' ',ish.Y);
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var p1: Point := Point(icl.Clone);
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p := nil;
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writeln(p1.X,' ',p1.Y);
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writeln(ish is Point);
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writeln(ish is ICloneable); // Cross cast!
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end. |