simple stop watch (timer)

stopWatch.hpp

class stopWatch {
 private:
  decltype(std::chrono::high_resolution_clock::now()) start = std::chrono::high_resolution_clock::now();

 public:
  ~stopWatch() {
    const auto finish = std::chrono::high_resolution_clock::now();
    const auto durationMilliSeconds = std::chrono::duration_cast<std::chrono::milliseconds>(finish - start).count();
    std::cout << durationMilliSeconds << " ms" << std::endl;
  }
};

usage

int main() {
  {
    stopWatch t;
    // do some ...
  }
}