Timer.h

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#ifndef GALOIS_TIMER_H
#define GALOIS_TIMER_H

#include "Galois/config.h"

#ifdef HAVE_CXX11_CHRONO
#include <chrono>
#endif

namespace Galois {

#ifdef HAVE_CXX11_CHRONO
class Timer {
  typedef std::chrono::steady_clock clockTy;
  //typedef std::chrono::high_resolution_clock clockTy;
  std::chrono::time_point<clockTy> startT, stopT;
public:
  void start() { startT = clockTy::now(); }
  void stop() { stopT = clockTy::now(); }
  unsigned long get() const {
    return std::chrono::duration_cast<std::chrono::milliseconds>(stopT-startT).count();
  }
  unsigned long get_usec() const {
    return std::chrono::duration_cast<std::chrono::microseconds>(stopT-startT).count();
  }
};
#else
class Timer {
  //This is so that implementations can vary without
  //forcing includes of target specific headers
  unsigned long _start_hi;
  unsigned long _start_low;
  unsigned long _stop_hi;
  unsigned long _stop_low;
public:
  Timer();
  void start();
  void stop();
  unsigned long get() const;
  unsigned long get_usec() const;
};
#endif

class TimeAccumulator {
  Timer ltimer;
  unsigned long acc;
public:
  TimeAccumulator();
  void start();
  void stop(); 
  unsigned long get() const;
  TimeAccumulator& operator+=(const TimeAccumulator& rhs);
  TimeAccumulator& operator+=(const Timer& rhs);
};

}
#endif

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