Logger.hpp

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#ifndef WBC_TOOLS_LOGGER_HPP
#define WBC_TOOLS_LOGGER_HPP
 
#include <iostream>
#include <sstream>
 
/* consider adding boost thread id since we'll want to know whose writting and
 * won't want to repeat it for every single call */
 
/* consider adding policy class to allow users to redirect logging to specific
 * files via the command line
 */
 
enum loglevel_e
    {logERROR, logWARNING, logINFO, logDEBUG, logDEBUG1, logDEBUG2, logDEBUG3, logDEBUG4};
 
class logger
{
public:
    logger(loglevel_e _loglevel = logERROR) {
        _buffer << _loglevel << " :" 
            << std::string(
                _loglevel > logDEBUG 
                ? (_loglevel - logDEBUG) * 4 
                : 1
                , ' ');
    }
 
    template <typename T>
    logger & operator<<(T const & value)
    {
        _buffer << value;
        return *this;
    }
 
    ~logger()
    {
        _buffer << std::endl;
        // This is atomic according to the POSIX standard
        // http://www.gnu.org/s/libc/manual/html_node/Streams-and-Threads.html
        std::cerr << _buffer.str();
    }
 
private:
    std::ostringstream _buffer;
};
 
extern loglevel_e loglevel;
 
#define log(level) \
if (level > loglevel) ; \
else logger(level)
 
#endif // WBC_TOOLS_LOGGER_HPP