Count time between new lines

freqtail.cpp

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

int main() {
  using namespace std::chrono;
  std::string line;
  auto t = steady_clock::now();
  while (std::cin >> line) {
    const auto now = steady_clock::now();
    const auto diff = now - t;
    t = now;
    const auto millisec = duration_cast<milliseconds>(diff).count();
    std::cout << millisec << std::endl;
  }
}