84 };

    84 };

    85 

    85 

    86 /**

    86 /**

    87  * list of shapes

    87  * list of shapes

    88  */

    88  */

    89 typedef vector<Shape*> ShapeList;

    89 typedef vector<const Shape*> ShapeList;

    90 

    90 

    91 /**

    91 /**

    92  * sphere shape

    92  * sphere shape

    93  */

    93  */

    94 class Sphere: public Shape

    94 class Sphere: public Shape

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