// https://stackoverflow.com/questions/31905157/how-to-print-the-execution-time-of-my-code
#ifndef TIMER_HPP
#define TIMER_HPP

#include <chrono>
#include <iostream>
#include <thread>
#include <iomanip>
#include <string>

namespace my{
  class Timer
  {
    using clk = std::chrono::steady_clock;
    //using clk = std::chrono::high_resolution_clock;
    clk::time_point b; // begin
    clk::time_point e; // end
    double secs(void) const{
      if(e <= b) return 0.0;
      auto d = std::chrono::duration_cast<std::chrono::microseconds>(e - b);
      return d.count() / 1000000.0;
    }
  public:
    void clear(void) { b = e = clk::now(); }
    void start(void) { b = clk::now(); }
    void stop(void)  { e = clk::now(); }
    void tic(void) {start();}
    void toc(void) {stop();}
    void tocs(std::ostream &o=std::cout) {stop(); o << secs()<<" s\n";}    
    friend std::ostream& operator<<(std::ostream &o , const Timer &timer) { return o << timer.secs(); }
  };
}
#endif