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            把握命運,追逐夢想

            對自己所做的事要有興趣,同時還要能夠堅持不懈

            統計

            留言簿(1)

            閱讀排行榜

            評論排行榜

            istream_iterator的自增

             

              // TEMPLATE CLASS istream_iterator
            template<class _Ty,
             class _Elem = char,
             class _Traits = char_traits<_Elem>,
             class _Diff = ptrdiff_t>
             class istream_iterator
              : public iterator<input_iterator_tag, _Ty, _Diff,
               const _Ty *, const _Ty&>
             { // wrap _Ty extracts from input stream as input iterator
             typedef istream_iterator<_Ty, _Elem, _Traits, _Diff> _Myt;
            public:
             typedef _Elem char_type;
             typedef _Traits traits_type;
             typedef basic_istream<_Elem, _Traits> istream_type;

            #if _SECURE_SCL
             typedef _Range_checked_iterator_tag _Checked_iterator_category;
            #endif

             istream_iterator()
              : _Myistr(0)
              { // construct singular iterator
              }

             istream_iterator(istream_type& _Istr)
              : _Myistr(&_Istr)
              { // construct with input stream
              _Getval();
              }

             const _Ty& operator*() const
              { // return designated value

             #if _HAS_ITERATOR_DEBUGGING
              if (_Myistr == 0)
               {
               _DEBUG_ERROR("istream_iterator is not dereferencable");
               _SCL_SECURE_OUT_OF_RANGE;
               }
             #else
              _SCL_SECURE_VALIDATE_RANGE(_Myistr != 0);
             #endif /* _HAS_ITERATOR_DEBUGGING */

              return (_Myval);
              }

             const _Ty *operator->() const
              { // return pointer to class object
              return (&**this);
              }

             _Myt& operator++()
              { // preincrement

             #if _HAS_ITERATOR_DEBUGGING
              if (_Myistr == 0)
               {
               _DEBUG_ERROR("istream_iterator is not incrementable");
               _SCL_SECURE_OUT_OF_RANGE;
               }
             #else
              _SCL_SECURE_VALIDATE_RANGE(_Myistr != 0);
             #endif /* _HAS_ITERATOR_DEBUGGING */

              _Getval();
              return (*this);
              }

             _Myt operator++(int)
              { // postincrement
              _Myt _Tmp = *this;
              ++*this;
              return (_Tmp);
              }

             bool _Equal(const _Myt& _Right) const
              { // test for iterator equality
              return (_Myistr == _Right._Myistr);
              }

            protected:
             void _Getval()
              { // get a _Ty value if possible
              if (_Myistr != 0 && !(*_Myistr >> _Myval))
               _Myistr = 0;
              }

             static void _Xran()
              { // report an out_of_range error
              _THROW(out_of_range, "invalid istream_iterator");
              }

             istream_type *_Myistr; // pointer to input stream
             _Ty _Myval; // lookahead value (valid if _Myistr is not null)
             };

              // istream_iterator TEMPLATE OPERATORS
            template<class _Ty,
             class _Elem,
             class _Traits,
             class _Diff> inline
             bool operator==(
              const istream_iterator<_Ty, _Elem, _Traits, _Diff>& _Left,
              const istream_iterator<_Ty, _Elem, _Traits, _Diff>& _Right)
             { // test for istream_iterator equality
             return (_Left._Equal(_Right));
             }

            template<class _Ty,
             class _Elem,
             class _Traits,
             class _Diff> inline
             bool operator!=(
              const istream_iterator<_Ty, _Elem, _Traits, _Diff>& _Left,
              const istream_iterator<_Ty, _Elem, _Traits, _Diff>& _Right)
             { // test for istream_iterator inequality
             return (!(_Left == _Right));
             }

            紅色部分就是重點了,其實這種迭代器不能自增,只是不斷把流中的元素放到自己所存的值里,當到達流末尾時,直接將判斷指針設為0。

            posted on 2009-08-20 12:45 把握命運 閱讀(996) 評論(0)  編輯 收藏 引用

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