Answer by Timmmm for Measuring the runtime of a C++ code?

This is the code I use:

  const auto start = std::chrono::steady_clock::now();  // Your code here.  const auto end = std::chrono::steady_clock::now();  std::chrono::duration<double> elapsed = end - start;  std::cout << "Time in seconds: "<< elapsed.count() << '\n';

You don't want to use std::chrono::system_clock because it is not monotonic! If the user changes the time in the middle of your code your result will be wrong - it might even be negative. std::chrono::high_resolution_clock might be implemented using std::chrono::system_clock so I wouldn't recommend that either.

This code also avoids ugly casts.