Working with the various stream classes in POCO. - POCO C++ ...

class UpperIOS: public virtual std::ios
{
public:
UpperIOS(std::ostream& ostr): _buf(ostr)
{
poco_ios_init(&_buf);
}
protected:
UpperStreamBuf _buf;
};
class UpperOutputStream: public UpperIOS, public std::ostream
{
public:
UpperOutputStream(std::ostream& ostr):
UpperIOS(ostr),
std::ostream(&_buf)
{
}
};