Method operator++

cpp/src/arrow/util/range.h:116–120

post-increment

    // post-increment
    RangeIter operator++(int) {
      auto copy = RangeIter(*this);
      ++index_;
      return copy;
    }

    bool operator==(const typename LazyRange<Generator>::RangeIter& other) const {
      return this->index_ == other.index_ && this->range_ == other.range_;