Method operator++

include/barrier.h:185–194

  DEVICE uint32_t count() const { return count_; }

  DEVICE void operator++() {
    if constexpr (Stages > 0) {
      ++index_;
      ++count_;
      if (index_ == Stages) {
        index_ = 0;
        phase_ ^= 1;
      }
    }
  }

  DEVICE PipelineState &operator=(const PipelineState &other) {
    index_ = other.index();