double-patching 经过两次虚函数实如今VS上测试（More effective C++233）

class A; class B; class Vbase { public: virtual void Test(Vbase & obj)=0; virtual void Test(A &obj)=0; virtual void Test(B &obj)=0; }; class A:public Vbase { public: virtual void Test(Vbase & aVbase

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