C++ 11 measure elapsed time

cxx11_elapsed_time.cc

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

void foo() {
  std::this_thread::sleep_for(std::chrono::milliseconds(100));
}

int main(int argc, char **argv) {
  auto start_time = std::chrono::high_resolution_clock::now();
  foo();
  auto end_time = std::chrono::high_resolution_clock::now();
  auto diff = end_time - start_time;
  std::cout << "elapsed time: "
      << std::chrono::duration_cast<std::chrono::milliseconds>(diff).count()
      << " ms" << std::endl;
  return 0;
}