199 struct iterator  struct
207     typedef iterator<Buff, typename Traits::nonconst_self> nonconst_self;
210     typedef std::random_access_iterator_tag iterator_category;
213     typedef typename Traits::value_type value_type;
216     typedef typename Traits::pointer pointer;
219     typedef typename Traits::reference reference;
222     typedef typename Traits::size_type size_type;
225     typedef typename Traits::difference_type difference_type;
230     const Buff* m_buff;
233     pointer m_it;
240     iterator() : m_buff(0), m_it(0) {}  in iterator()  argument
245     iterator(const nonconst_self& it) : debug_iterator_base(it), m_buff(it.m_buff), m_it(it.m_it) {}  in iterator()  argument
251     iterator(const Buff* cb, const pointer p) : debug_iterator_base(cb), m_buff(cb), m_it(p) {}  in iterator()  function
255     iterator(const nonconst_self& it) : m_buff(it.m_buff), m_it(it.m_it) {}  in iterator()  function
257     iterator(const Buff* cb, const pointer p) : m_buff(cb), m_it(p) {}  in iterator()  argument
262     iterator& operator = (const iterator& it) {  in operator =()
276     reference operator * () const {  in operator *()
283     pointer operator -> () const { return &(operator*()); }  in operator ->()
287     difference_type operator - (const iterator<Buff, Traits0>& it) const {  in operator -()
294     iterator& operator ++ () {  in operator ++()
304     iterator operator ++ (int) {  in operator ++()
311     iterator& operator -- () {  in operator --()
321     iterator operator -- (int) {  in operator --()
328     iterator& operator += (difference_type n) {  in operator +=()
342     iterator operator + (difference_type n) const { return iterator<Buff, Traits>(*this) += n; }  in operator +()
345     iterator& operator -= (difference_type n) {  in operator -=()
357     iterator operator - (difference_type n) const { return iterator<Buff, Traits>(*this) -= n; }  in operator -()
360     reference operator [] (difference_type n) const { return *(*this + n); }  in operator []()
366     bool operator == (const iterator<Buff, Traits0>& it) const {  in operator ==()
374     bool operator != (const iterator<Buff, Traits0>& it) const {  in operator !=()
382     bool operator < (const iterator<Buff, Traits0>& it) const {  in operator <()
390     bool operator > (const iterator<Buff, Traits0>& it) const { return it < *this; }  in operator >()
394     bool operator <= (const iterator<Buff, Traits0>& it) const { return !(it < *this); }  in operator <=()
398     bool operator >= (const iterator<Buff, Traits0>& it) const { return !(*this < it); }  in operator >=()
404     typename Traits0::pointer linearize_pointer(const iterator<Buff, Traits0>& it) const {  in linearize_pointer()