I've seen this sort of pointer (assuming the author means it's nullable) be called "clone_ptr<T>" but it called T's clone() method. Because T might be a base c

I've seen this sort of pointer (assuming the author means it's nullable) be called "clone_ptr<T>" but it called T's clone() method. Because T might be a base class, invoking the pointee's copy constructor in C++ is not a great idea.