Method frontIndex

app/src/DSP.h:149–149

* @brief Returns the storage index of the front (oldest) element. Pair with * `nextIndex()` (or `storageMask()`) to walk the ring without modulo. */

   *        `nextIndex()` (or `storageMask()`) to walk the ring without modulo.
   */
  [[nodiscard]] std::size_t frontIndex() const { return m_start; }

  /**
   * @brief Returns `(idx + 1) & storageMask` -- the next storage position when