33 lines
1.1 KiB
C++
33 lines
1.1 KiB
C++
#ifndef INPUT_ITERATOR_H
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#define INPUT_ITERATOR_H
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#include <iterator>
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template <class It>
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class input_iterator
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{
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It it_;
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public:
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typedef typename std::input_iterator_tag iterator_category;
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typedef typename std::iterator_traits<It>::value_type value_type;
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typedef typename std::iterator_traits<It>::difference_type difference_type;
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typedef It pointer;
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typedef typename std::iterator_traits<It>::reference reference;
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input_iterator() : it_() {}
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explicit input_iterator(It it) : it_(it) {}
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reference operator*() const {return *it_;}
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pointer operator->() const {return it_;}
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input_iterator& operator++() {++it_; return *this;}
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input_iterator operator++(int) {input_iterator tmp(*this); ++(*this); return tmp;}
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friend bool operator==(const input_iterator& x, const input_iterator& y)
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{return x.it_ == y.it_;}
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friend bool operator!=(const input_iterator& x, const input_iterator& y)
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{return !(x == y);}
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};
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#endif // INPUT_ITERATOR_H
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