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//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#ifndef INPUT_ITERATOR_H
#define INPUT_ITERATOR_H
#include <iterator>
template <class It>
class cpp17_input_iterator
{
It it_;
public:
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;
cpp17_input_iterator() : it_() {}
explicit cpp17_input_iterator(It it) : it_(it) {}
reference operator*() const {return *it_;}
pointer operator->() const {return it_;}
cpp17_input_iterator& operator++() {++it_; return *this;}
cpp17_input_iterator operator++(int) {cpp17_input_iterator tmp(*this); ++(*this); return tmp;}
friend bool operator==(const cpp17_input_iterator& x, const cpp17_input_iterator& y)
{return x.it_ == y.it_;}
friend bool operator!=(const cpp17_input_iterator& x, const cpp17_input_iterator& y)
{return !(x == y);}
};
#endif // INPUT_ITERATOR_H
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