#include <chrono>
#include <iostream>
#include <thread>

typedef std::chrono::system_clock::time_point  tp_t;
typedef std::chrono::nanoseconds               ns_t;

int main () {
  tp_t start = std::chrono::high_resolution_clock::now();
  std::this_thread::sleep_for(std::chrono::nanoseconds(100000));
  tp_t stop = std::chrono::high_resolution_clock::now();
  std::cout << "Elapsed time: "
            << std::chrono::duration_cast<ns_t>(stop - start).count()
            << " in nanos." << std::endl;
  return 0;
}