773ae44124
C++20 revised the definition of what it means to be an iterator. While all _Cpp17InputIterators_ satisfy `std::input_iterator`, the reverse isn't true. D100271 introduces a new test adaptor to accommodate this new definition (`cpp20_input_iterator`). In order to help readers immediately distinguish which input iterator adaptor is _Cpp17InputIterator_, the current `input_iterator` adaptor has been prefixed with `cpp17_`. Differential Revision: https://reviews.llvm.org/D101242
41 lines
1.5 KiB
C++
41 lines
1.5 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#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 cpp17_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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cpp17_input_iterator() : it_() {}
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explicit cpp17_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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cpp17_input_iterator& operator++() {++it_; return *this;}
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cpp17_input_iterator operator++(int) {cpp17_input_iterator tmp(*this); ++(*this); return tmp;}
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friend bool operator==(const cpp17_input_iterator& x, const cpp17_input_iterator& y)
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{return x.it_ == y.it_;}
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friend bool operator!=(const cpp17_input_iterator& x, const cpp17_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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