Code (C++)

#ifndef BENCHMARKTIMER_H
#define BENCHMARKTIMER_H

#  include <chrono>
#  include <string>
#  include <stdio.h>

using duration_t = std::chrono::duration<double>;

enum class Zeiteinheit_t { Sekunden, Millisekunden, Mikrosekunden };

// #define USE_NOW

class Stoppuhr // #include <chrono>
{
  std::chrono::steady_clock::time_point start;
  std::chrono::steady_clock::time_point end;

public:

  Stoppuhr() //: Zeiteinheit_t zes = Zeiteinheit_t::Sekunden) : // zes_(zes),
#ifdef USE_NOW
    : start(std::chrono::steady_clock::now())
#endif
    {};
  void Start()
  {
#ifdef USE_NOW
    start = std::chrono::steady_clock::now();
#endif
  };

  void Stop()
  {
#ifdef USE_NOW
    end = std::chrono::steady_clock::now();
#endif
  };

};