面试题48 不能被继承的类

 1 class A
 2 {
 3 public:
 4     static A* getInstance()
 5     {
 6         return new A();
 7     }
 8 
 9     static void DeleteInstance(A *a)
10     {
11         delete a;
12     }
13 private:
14     A(){}
15     ~A(){}
16 };
 1 template<class T> class B
 2 {
 3     friend T;
 4 private:
 5     B(){}
 6     ~B(){}
 7 };
 8 
 9 class C:virtual public B<C>
10 {
11 public:
12     C(){}
13     ~C(){}
14 };
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原文地址：https://www.cnblogs.com/wanderingzj/p/5363640.html