error: invalid new-expression of abstract class type 'Rectangle'
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class GeometricObject {……virtual bool hit(const Ray& ray, double& t, ShadeRec& s) const = 0;……};class Rectangle: public GeometricObject {};Rectangle继承了GeometricObject，所以必须实现GeometricObject的纯虚函数hit()。
若在没有实现hit()的情况下就“new Rectangle”，就会报这个错误：“error: invalid new-expression of abstract class type 'Rectangle'”
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