#pragma once

#include <ctime>
#include <iostream>
#include <iomanip>

namespace Moses2
{

/** Wrapper around time_t to time how long things have been running
 *  according to walltime. We avoid CPU time since it is less reliable
 *  in a multi-threaded environment and can spuriously include clock cycles
 *  used by other threads in the same process.
 */
class Timer
{
  friend std::ostream& operator<<(std::ostream& os, Timer& t);

private:
  bool running;
  bool stopped;
  double start_time;
  double stop_time;

public:
  /***
   * 'running' is initially false.  A timer needs to be explicitly started
   * using 'start'
   */
  Timer();

  void start(const char* msg = 0);
  void stop(const char* msg = 0);
  void check(const char* msg = 0);
  double get_elapsed_time() const;
};

}