如何通过派生的指针在基类中调用模板成员函数

Question

The following example is just a simplified skeleton of my code. My question is that why I cannot call the template member function from the derived pointer. According to my understanding, the member function of the base class usually can be also called from the derived object or pointer.

class Base {
 public:
  template<typename T> T* data() { 
    static_cast<T *>(data(dtype)); 
  }
  virtual void data(DataType dtype) = 0;
};

class Derived1 : public Base {
  public:
   void data(DataType dtype) override { ... }
};

class Derived2 : public Base {
  public:
   void data(DataType dtype) override { ... }
};

int main() {
  Base * base = new Derived1();
  ...
  Derived1 * derived1 = dynamic_cast<Derived1 *>(base);
  derived1->tempalte data<int>(); // Compiling error
  ...
}

Answer 1

Derived1::data hides all members named data in Base . If you want to make them visible, add this line anywhere in the body of Derived1 :

using Base::data;