To block a class from being derived any further, declare its constructor private. Next, add a public static member function Instance() that creates an instance of this class and returns its address. Calling Instance() is the only way to create instances of this class because the constructor is otherwise inaccessible. Here’s an example:
class A{private: A(); // private constructorpublic: static A* Instance(){ return new A;}};main(){ A *pa = A::Instance(); // use pa delete pa;}
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