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// The LLVM Compiler Infrastructure
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
#include <iterator>
template <class It>
class input_iterator
It it_;
typedef typename std::input_iterator_tag iterator_category;
typedef typename std::iterator_traits<It>::value_type value_type;
typedef typename std::iterator_traits<It>::difference_type difference_type;
typedef It pointer;
typedef typename std::iterator_traits<It>::reference reference;
input_iterator() : it_() {}
explicit input_iterator(It it) : it_(it) {}
reference operator*() const {return *it_;}
pointer operator->() const {return it_;}
input_iterator& operator++() {++it_; return *this;}
input_iterator operator++(int) {input_iterator tmp(*this); ++(*this); return tmp;}
friend bool operator==(const input_iterator& x, const input_iterator& y)
{return x.it_ == y.it_;}
friend bool operator!=(const input_iterator& x, const input_iterator& y)
{return !(x == y);}