timer.h

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#ifndef ION_PORT_TIMER_H_
#define ION_PORT_TIMER_H_

#include <chrono>  // NOLINT
#include <type_traits>

#include "base/integral_types.h"

namespace ion {
namespace port {

class Timer {
 public:
#if defined(ION_PLATFORM_WINDOWS)
  struct steady_clock {
    typedef int64 rep;
    typedef std::nano period;
    typedef std::chrono::duration<rep, period> duration;
    typedef std::chrono::time_point<steady_clock> time_point;
    static const bool is_steady = true;

    static time_point now();
  };

#else
  typedef std::conditional<std::chrono::high_resolution_clock::is_steady,
                           std::chrono::high_resolution_clock,
                           std::chrono::steady_clock>::type steady_clock;
#endif

  typedef steady_clock Clock;

  Timer() { Reset(); }

  void Reset();

  Clock::duration Get() const;

  double GetInS() const;

  double GetInMs() const;

  static void SleepNSeconds(unsigned int seconds);

  static void SleepNMilliseconds(unsigned int milliseconds);

 private:
  steady_clock::time_point start_;
};

}  // namespace port
}  // namespace ion

#endif  // ION_PORT_TIMER_H_