如何添加最终重写器

如何添加“最终重写器”来解决此问题?

#include <iostream>

struct Shape
{
  virtual void print()
  {
    std::cout << "SHAPE" << std::endl;
  }
  virtual ~Shape() {}
};

struct Box : public virtual Shape
{
  void print() 
  {
    std::cout << "BOX" << std::endl;
  }
};

struct Sphere : public virtual Shape
{
  void print() final override
  {
    std::cout << "SPHERE" << std::endl;
  }
};

struct GeoDisc : public Box, public Sphere
{
};

int main(int argc, char** argv)
{
  Shape* s = new GeoDisc;

  s->print();

  delete s;

  return 0;
}

这是错误消息:
31:8:错误:“GeoDisc”中的“virtual void Shape::print()”没有唯一的最终重写器