ATL / WTL / STL

class CDtLog 
{

private: 
	std::ostringstream	m_os;
	bool		bNewEntry;
	int		m_nPrio;
	char*		m_szGroup[40];

public:
	CDtLog()
	{
		bNewEntry = true;
		m_nPrio = 2;
		m_szGroup[0] = NULL;
	}

	template<class T>
		CDtLog &operator<<(const T &item)
		{
			if (bNewEntry)
			{
				m_os << "<entry prio=\"" << m_nPrio << "\" ";
				if (m_szGroup[0]) m_os << "group=\"" << m_szGroup << "\" ";
				m_os << ">";
				bNewEntry = false; 
			}
			m_os << item ;
			return *this;
		};

		void print()
		{
			printf(m_os.str().c_str());
		}
};


int _tmain(int argc, _TCHAR* argv[])
{
	CDtLog test;
	int i = 10;
	test << "hejsan" << std::setfill(' ') << std::setw(10) << 12 << i;
	test.print();


	return 0;
}