template<typename eT, typename wT, typename iT, typename tT>
class Logger: public libs::task::Singleton<Logger<eT, wT, iT, tT> > {
private: friend libs::task::Singleton<Logger<eT, wT, iT, tT> >;
private: using libs::task::Singleton<Logger<eT, wT, iT, tT> >::Instance;

// =============================================================================
// Section for Ctor / Dtor
// =============================================================================
private: Logger() {}

// =============================================================================
// Section for Implement / Overridden
// =============================================================================

// =============================================================================
// Section for Other methods
// =============================================================================
public: template<typename logItemType> inline void error(logItemType item);
public: template<typename logItemType> inline void warning(logItemType item);
public: template<typename logItemType> inline void info(logItemType item);
public: template<typename logItemType> inline void trace(logItemType item);

public: inline const eT& error() const;
public: inline const wT& warning() const;
public: inline const iT& info() const;
public: inline const tT& trace() const;

// =============================================================================
// Section for Member declaration
// =============================================================================
private: eT _error;
private: wT _warning;
private: iT _info;
private: tT _trace;
};

typedef Logger<MemoryContainer<2, const char*>,
        MemoryContainer<4, const char*>,
        MemoryContainer<10, const char*>,
        MemoryContainer<10, const char*> >
ConstStrLogger;