Stopwatch.hpp

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#pragma once
 
#include <chrono>
 
class Stopwatch {
  typedef std::chrono::high_resolution_clock clock_t;
 
 public:
  void start() {
    start_ = clock_t::now();
    running_ = true;
  }
 
  void reset() {
    elapsed_ = 0.;
    running_ = false;
  }
 
  double stop() {
    elapsed_ = calcElapsed_();
    running_ = false;
    return elapsed_;
  }
 
  double elapsed() const {
    if (!running_)
      return elapsed_;
    else
      return calcElapsed_();
  }
 
  void resume() {
    start_ = clock_t::now() -
             std::chrono::microseconds(static_cast<long>(elapsed_ * 1e6));
    running_ = true;
  }
 
 protected:
  double elapsed_{0};
  bool running_{false};
 
 private:
  std::chrono::time_point<clock_t> start_;
 
  double calcElapsed_() const {
    const auto end = clock_t::now();
    return std::chrono::duration_cast<std::chrono::microseconds>(end - start_)
               .count() /
           1e6;
  }
};