C2143具有嵌套的模板类

template<class T_Type1>
class CSmall
{
public:  
  class Const_Itr
  {
    T_Type1  Outer_A;
  };
private:
  T_Type1  Inner_A;
};

template<class T_Type>
class CBig
{
public:
  CSmall<T_Type>::Const_Itr*            obj1;//ERROR C2143: syntax error : missing \';\' before \'*\'
  typename CSmall<T_Type>::Const_Itr*   obj2;// NO error after using \'typename\' keyword
}; // CIPPortExpectationHandler

void main()
{
  CSmall<int>::Const_Itr*   obj3;// NO error even if \'typename\' keyword in NOT used.
}