Function ElapsedMs

src/tools/SpeedBenchmark.cpp:47–49

using Clock = std::chrono::steady_clock;

static double ElapsedMs(Clock::time_point a, Clock::time_point b) {
  return std::chrono::duration<double, std::milli>(b - a).count();
}

static std::string ReadFile(const std::string& path) {
  std::ifstream f(path, std::ios::binary);