28     It base() const {return it_;}  in base()  function
55     It base() const {return it_;}  in base()  function
104     It base() const {return it_;}  in base()  function
153     It base() const {return it_;}  in base()  function
201     It base() const {return it_;}  in base()  function
288 inline Iter base(output_iterator<Iter> i) { return i.base(); }  in base()  function
291 inline Iter base(input_iterator<Iter> i) { return i.base(); }  in base()  function
294 inline Iter base(forward_iterator<Iter> i) { return i.base(); }  in base()  function
297 inline Iter base(bidirectional_iterator<Iter> i) { return i.base(); }  in base()  function
300 inline Iter base(random_access_iterator<Iter> i) { return i.base(); }  in base()  function
303 inline Iter base(Iter i) { return i; }  in base()  function