File content as of revision 0:eae9045546f3:

#ifndef xenonym_logging_header /* { */
#define xenonym_logging_header

#include <Serial.h>

/**
 * by default you will get logging, if you do no want if for a certain file define this 
 * and when it compiles all the logging should get compiled away as the nullLogger has
 * a big set of empty inline no-virtual functions.
 */
#ifdef LOGGING_DISABLED
#define LOGGER xenonym::logging::NullLogger::logger
#else
#define LOGGER xenonym::logging::RealLogger::logger
#endif

/**
 * LOGGERALWAYS and LOGALWAYS are always logged, due to the design there is always a logger object in you app
 * its just not used if you disable logging.
 * this allows you to log critial messages when logging is disabled for the module.
 */
#define LOGGERALWAYS xenonym::logging::RealLogger::logger
#define LOGALWAYS xenonym::logging::RealLogger::logger << xenonym::logging::eol

/**
 * to get the indents right easily the simplist solution is to send an end-of-line (eol) 
 * at the BEGINNING of each log line;
 *  if you want the log at the end of the previous line use LOGGER << instead of the more common LOG << 
 */
#define LOG LOGGER << xenonym::logging::eol

#define LOGFUNC( x ) xenonym::logging::Func func( x, __FILE__, __LINE__ )
#define LOGSCOPE( n, x ) xenonym::logging::Scope n( x, __FILE__, __LINE__ )

namespace xenonym
{
    namespace logging
    {
        class LogManipulator
        {
        public:
            virtual void log ( unsigned i ) = 0;
            virtual void log ( int i ) = 0;
            virtual void log ( long long i ) = 0;
            virtual void log ( unsigned long long i ) = 0;
            virtual void log ( char c ) = 0;
            virtual void log ( char const * str ) = 0;
            virtual void set_radix ( int i ) = 0;
            virtual void set_indent ( int i ) = 0;
            virtual int  get_indent () = 0;
        };
        
        typedef void (*manipFunc)( LogManipulator & );
        
        class NullLogger
        {
        public:
            NullLogger & operator<< ( unsigned i ) { return *this; }
            NullLogger & operator<< ( int i ) { return *this; }
            NullLogger & operator<< ( long long i ) { return *this; }
            NullLogger & operator<< ( unsigned long long int i ) { return *this; }
            NullLogger & operator<< ( char i ) { return *this; }
            NullLogger & operator<< ( char const * str ) { return *this; }
            NullLogger & operator<< ( manipFunc manipulator ) { return *this; }
            static NullLogger logger;
        };
        
        class RealLogManipulator;
        class RealLogger
        {
        private:
             friend class RealLogManipulator;
             mbed::Serial m_comms;
             int m_radix;
             int m_indent;
        public:
            RealLogger();
            RealLogger & operator<< ( unsigned i );
            RealLogger & operator<< ( int i );
            RealLogger & operator<< ( long long i );
            RealLogger & operator<< ( unsigned long long int i );
            RealLogger & operator<< ( char i );
            RealLogger & operator<< ( char const * str );
            RealLogger & operator<< ( manipFunc manipulator );
            static RealLogger logger;
        };
        
        /**
         * will sent an end of line and then indent the log stream as required
         * N.B. LOG << "\n" will NOT output the indent to the log stream.
         */
        void eol( LogManipulator & );
        void hex( LogManipulator & );
        void dec( LogManipulator & );
        void indent( LogManipulator & );
        void outdent( LogManipulator & );
        
        class Locn
        {
        protected:
            char const * m_file;
            int          m_line;
        public:
            Locn(char const * const file, int line );
            virtual ~Locn();
        };
        class Scope : public Locn
        {
        public:
            Scope(char const * const file, int line );
            virtual ~Scope();
        };
        
        class Func : public Locn
        {
        private:
            char const * m_name;
        public:
            Func(char const * const name, char const * const file, int line );
            virtual ~Func();
        };
        
    } // namespace logging;
} // namespace xenonym;

#endif /* } xenonym_logging_header */