Class timer

src/svgfill/src/arrange_polygons.cpp:2898–2936

}

class timer {
  public:
    class entry {
      public:
        entry() {}

        entry(std::map<std::string, std::chrono::high_resolution_clock::time_point>::const_iterator start_it)
            : start_it(start_it) {}

        void stop() {
            if (start_it) {
                auto end = std::chrono::high_resolution_clock::now();
                auto duration = std::chrono::duration<double, std::milli>(end - start_it.value()->second).count();
                std::cerr << "Timing for " << start_it.value()->first << ": " << duration << " ms" << std::endl;
            }     
        }

      private:
        std::optional<std::map<std::string, std::chrono::high_resolution_clock::time_point>::const_iterator> start_it;
    };

    timer(bool enabled = true) : enabled_(enabled) {}

    entry start(const std::string& name) {
        if (enabled_) {
            return entry(timings_.insert({name, std::chrono::high_resolution_clock::now()}).first);
        } else {
            return entry();
        }
    }

  private:
    std::map<
        std::string,
        std::chrono::high_resolution_clock::time_point>
        timings_;

    bool enabled_;
};

void arrange_cgal_polygons(svgfill::arrange_polygon_settings settings, const std::vector<Polygon_2>& input_polygons_, std::vector<Polygon_2>& output_polygons, double polygon_offset_distance = -1.) {
    static const double OVERLAP_RESOLUTION_DISTANCE = 1.e-1;