Do the log!

gistfile1.txt

Do this: http://www.techrepublic.com/article/use-stl-streams-for-easy-c-thread-safe-logging/5072104
Read this: http://www.drdobbs.com/cpp/logging-in-c/201804215?pgno=2

====== logging.hpp: ======

class LoggerBackend {

    void log(enum level l, const char* who, <whatever> message)
    {
        print time, who, level, message;
    }
};

extern LoggerBackend basic_static_logger;

class Logger {
    LoggerBackend * backend;
    std::string who;
    std::string hash;
    
    operator << (...)
    { backend->log(...) }
};

#define GET_LOGGER(name) LoggerBackend(&basic_static_logger, name, this)

====== logging.cpp: ======

static LoggerBackend basic_static_logger;

====== impl.cpp ======

struct Component {
    Component()
    {
        Logger logger;
        ComponentLogger() : logger(GET_LOGGER("Component"))) {}

        void func()
        {
            logger<<"Everything is good."<<std::flush;
            logger.info<<"Everything still good."<<std::flush;
            logger.warning<<"Trouble ahead"<<std::flush;
            logger.error<<"Stuff just exploded."<<std::flush;
        }
    };
    
};