Measure elapsed time

cpp_elapsed_time.cpp

#include <iostream>
#include <chrono>

int main() {

  auto t0(std::chrono::steady_clock::now());

  // some code to measure time for

  auto t1(std::chrono::steady_clock::now());
  auto duration = std::chrono::duration_cast<std::chrono::milliseconds>(t1 - t0);

  std::cout << duration.count() << std::endl;

  return 0;
}