alex

#ifndef __LOG_HPP__
#define __LOG_HPP__

#include <iostream>

namespace ale {

class Logger {
 public:
  enum mode { Info = 0, Warning = 1, Error = 2 };
  /** @brief Allow to change the level of verbosity
   *  @param m Info will print all the messages, Warning only the important ones
   *  and Error the critical ones
   */
  static void setMode(mode m);

 private:
  static mode current_mode;
  friend mode operator<<(mode, std::ostream& (*manip)(std::ostream&));
  template <typename T> friend mode operator<<(mode, const T&);
};

Logger::mode operator<<(Logger::mode log,
                        std::ostream& (*manip)(std::ostream&));

template <typename T> Logger::mode operator<<(Logger::mode log, const T& val) {
  if (log >= Logger::current_mode) std::cerr << val;
  return log;
}

} // namespace ale

#endif  // __LOG_HPP__