Question

#include <list>

template < class TYPE > 
class CIndex : protected std::list < TYPE >
{
public:
    typedef std::list < TYPE >::iterator  CIndexIt;
    typedef std::list < TYPE >::difference_type  CIndexDiff;

The error happens in the last line of the above code.

I’ve seen this and the msdn page but both don’t solve my error.

Anyone knows what could be causing the problem?

EDIT:
The reason the first link’s solution didn’t work was because although adding typename worked for the above code, it didn’t work for the below code:

#include<hash_map>
class CWItems
{
typedef stdext::hash_map < unsigned long, CWksItem* >   CItem;
CItem mItems;

So I thought I was doing the wrong thing by adding typename everywhere. Using typename after the typedef in this code caused this error:

error C2899: typename cannot be used outside a template declaration

Without typename, the error shown is error C4430: missing type specifier - int assumed. Note: C++ does not support default-int, at the CItem mItems; line.

Answer 1

You need to add the typename keyword because std::list<TYPE>::iterator and std::list<TYPE>::difference_type are dependent names:

typedef typename std::list < TYPE >::iterator  CIndexIt;
typedef typename std::list < TYPE >::difference_type  CIndexDiff;

See http://pages.cs.wisc.edu/~driscoll/typename.html for more information.