typename std::result_of::type retryWithBackoff()

in torchaudio/csrc/decoder/src/dictionary/System.h [64:94]

• 30 lines of code
• 10 McCabe index (conditional complexity)

typename std::result_of<Fn(Args...)>::type retryWithBackoff(
    std::chrono::duration<double> initial,
    double factor,
    int64_t maxIters,
    Fn&& f,
    Args&&... args) {
  if (!(initial.count() >= 0.0)) {
    throw std::invalid_argument("retryWithBackoff: bad initial");
  } else if (!(factor >= 0.0)) {
    throw std::invalid_argument("retryWithBackoff: bad factor");
  } else if (maxIters <= 0) {
    throw std::invalid_argument("retryWithBackoff: bad maxIters");
  }
  auto sleepSecs = initial.count();
  for (int64_t i = 0; i < maxIters; ++i) {
    try {
      return f(std::forward<Args>(args)...);
    } catch (...) {
      if (i >= maxIters - 1) {
        throw;
      }
    }
    if (sleepSecs > 0.0) {
      /* sleep override */
      std::this_thread::sleep_for(
          std::chrono::duration<double>(std::min(1e7, sleepSecs)));
    }
    sleepSecs *= factor;
  }
  throw std::logic_error("retryWithBackoff: hit unreachable");
}