template <class TRAITS>
class cBase
{
public:
    long dataMember;
};
template <class TRAITS>
class cDerived : public cBase<TRAITS>
{
public:

    void foo()
    {
        cBase<TRAITS>::dataMember = 5; // this works ok
        this->dataMember = 5; // this works ok
        dataMember = 5; // this causes an error with dataMember not found
    }
};