note: declarations in dependent base ‘std::basic_ios<char>’ are not found by unqualified lookup

template<
typename _CharT,
typename _Traits = std::char_traits<_CharT>
>
class BasicStkIos
: virtual public std::basic_ios<_CharT, _Traits>
{
public:
typedef basic_stkbuf <_CharT,_Traits>        StkBufType;

BasicStkIos()
: mBuf()
{init(&mBuf) ;};

BasicStkIos(const char* fName, std::ios::openmode m, const char* pFilter)
: mBuf(fName, m, pFilter)
{ init(&mBuf) ; }

StkBufType*
rdbuf()
{ return &mBuf; }

protected:
StkBufType  mBuf;
};

template<
typename _CharT,
typename _Traits = std::char_traits<_CharT>
>
class BasicStkIos
: virtual public std::basic_ios<_CharT, _Traits>
{
public:
typedef basic_stkbuf <_CharT,_Traits>        StkBufType;

BasicStkIos()
: mBuf()
{this->init(&mBuf) ;};

BasicStkIos(const char* fName, std::ios::openmode m, const char* pFilter)
: mBuf(fName, m, pFilter)
{ init(&mBuf) ; }

StkBufType*
rdbuf()
{ return &mBuf; }

protected:
StkBufType  mBuf;
};