Stopwatch.hpp

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#ifndef DART_COMMON_STOPWATCH_HPP_
#define DART_COMMON_STOPWATCH_HPP_
 
#include <chrono>
#include <iostream>
 
namespace dart::common {
 
template <
    typename UnitType,
    typename ClockType = std::chrono::high_resolution_clock>
class Stopwatch final
{
public:
  explicit Stopwatch(bool start = true);
 
  ~Stopwatch();
 
  [[nodiscard]] bool isStarted() const;
 
  void start();
 
  void stop();
 
  void reset();
 
  [[nodiscard]] double elapsedS() const;
 
  [[nodiscard]] double elapsedMS() const;
 
  [[nodiscard]] double elapsedUS() const;
 
  [[nodiscard]] double elapsedNS() const;
 
  void print(std::ostream& os = std::cout) const;
 
  template <typename T, typename U>
  friend std::ostream& operator<<(std::ostream& os, const Stopwatch<T, U>& sw);
 
private:
  // Deletes copy/move constructors and assign/move operators
  Stopwatch(const Stopwatch&) = delete;
  Stopwatch(Stopwatch&&) = delete;
  Stopwatch& operator=(const Stopwatch&) = delete;
  Stopwatch& operator=(Stopwatch&&) = delete;
 
  [[nodiscard]] UnitType duration() const;
 
  typename ClockType::time_point mStart;
 
  UnitType mElapsed;
 
  bool mPaused;
};
 
void tic();
 
double toc(bool print = false);
 
double tocS(bool print = false);
 
double tocMS(bool print = false);
 
double tocUS(bool print = false);
 
double tocNS(bool print = false);
 
using StopwatchS = Stopwatch<std::chrono::seconds>;
using StopwatchMS = Stopwatch<std::chrono::milliseconds>;
using StopwatchUS = Stopwatch<std::chrono::microseconds>;
using StopwatchNS = Stopwatch<std::chrono::nanoseconds>;
 
} // namespace dart::common
 
#include "dart/common/detail/Stopwatch-impl.hpp"
 
#endif // DART_COMMON_STOPWATCH_HPP_