您必须将基本类型更改为多态：

You must change the base type to be polymorphic:

class Base {
public:
    Base() {};
    virtual ~Base(){};
};

要从某个超类型转换为某个派生类型，您应该使用 dynamic_cast ：

To cast from some supertype to some derived type, you should use dynamic_cast:

Base *b = new Derived<int>(1);
Derived<int> *d = dynamic_cast<Derived<int> *>(b);

使用 dynamic_cast 可能。如果没有必要进行检查（因为转换不会失败），你还可以使用 static_cast ：

Using dynamic_cast here checks that the typecast is possible. If there is no need to do that check (because the cast cannot fail), you can also use static_cast:

Base *b = new Derived<int>(1);
Derived<int> *d = static_cast<Derived<int> *>(b);