Method stop

src/svgfill/src/arrange_polygons.cpp:2907–2913

            : 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;