Std iterator as private member variable

[Michiel]

I have the following header file:

#include <list>
using namespace std;
 
template <class T>
class QuickList {
	public:
		// Some public things
 
	private:
		list<T> _theList;
		mutable list<T>::iterator _currentPointer;
};

#include <list>
using namespace std;

template <class T>
class QuickList {
	public:
		// Some public things
	
	private:
		list<T> _theList;
		mutable list<T>::iterator _currentPointer;
};

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When I try to compile, I get the following errors (line numbers changed to correspond with the code above:

In file included from quicklist.cpp:1:
quicklist.h:11: error: type `std::list<T, std::allocator<_CharT> >' is not derived from type `QuickList<T>'
quicklist.h:11: error: ISO C++ forbids declaration of `iterator' with no type
quicklist.h:11: error: expected `;' before "_currentPointer"

I need the mutable keyword if I want to keep my consts intact. However, if I remove it, I still get this single error:

In file included from quicklist.cpp:1:
quicklist.h:11: error: expected `;' before "_currentPointer"

I don't understand these errors. What am I doing wrong?

Could someone help me with this?

Thanks!