Function next

include/sonic/dom/genericnode.h:1021–1023

    return downCast()->nextImpl();
  }
  sonic_force_inline const NodeType* next() const noexcept {
    return downCast()->cnextImpl();
  }

  sonic_force_inline void addLength(size_t c) noexcept {
    sonic_assert(IsContainer() || IsString());