1bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant//===----------------------------------------------------------------------===// 2bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant// 3f5256e16dfc425c1d466f6308d4026d529ce9e0bHoward Hinnant// The LLVM Compiler Infrastructure 4bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant// 5b64f8b07c104c6cc986570ac8ee0ed16a9f23976Howard Hinnant// This file is dual licensed under the MIT and the University of Illinois Open 6b64f8b07c104c6cc986570ac8ee0ed16a9f23976Howard Hinnant// Source Licenses. See LICENSE.TXT for details. 7bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant// 8bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant//===----------------------------------------------------------------------===// 9bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant 10bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant// <iterator> 11bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant 12bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant// reverse_iterator 13bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant 14712522cfd8f61321b4f197ec0de02b0146afb5a5Howard Hinnant// requires RandomAccessIterator<Iter> 154414a6a91122ed02d42745e14ebefb116e5bf773Marshall Clow// constexpr reverse_iterator& operator+=(difference_type n); 164414a6a91122ed02d42745e14ebefb116e5bf773Marshall Clow// 174414a6a91122ed02d42745e14ebefb116e5bf773Marshall Clow// constexpr in C++17 18bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant 19bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant#include <iterator> 20bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant#include <cassert> 21bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant 224414a6a91122ed02d42745e14ebefb116e5bf773Marshall Clow#include "test_macros.h" 2383e2c4d877fe2d7793868b1c6a5d9525a7c4d431Marshall Clow#include "test_iterators.h" 24bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant 25bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnanttemplate <class It> 26bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnantvoid 27bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnanttest(It i, typename std::iterator_traits<It>::difference_type n, It x) 28bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant{ 29bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant std::reverse_iterator<It> r(i); 30bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant std::reverse_iterator<It>& rr = r += n; 31bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant assert(r.base() == x); 32bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant assert(&rr == &r); 33bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant} 34bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant 35bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnantint main() 36bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant{ 37bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant const char* s = "1234567890"; 38bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant test(random_access_iterator<const char*>(s+5), 5, random_access_iterator<const char*>(s)); 39bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant test(s+5, 5, s); 404414a6a91122ed02d42745e14ebefb116e5bf773Marshall Clow 414414a6a91122ed02d42745e14ebefb116e5bf773Marshall Clow#if TEST_STD_VER > 14 424414a6a91122ed02d42745e14ebefb116e5bf773Marshall Clow { 434414a6a91122ed02d42745e14ebefb116e5bf773Marshall Clow constexpr const char *p = "123456789"; 444414a6a91122ed02d42745e14ebefb116e5bf773Marshall Clow constexpr auto it1 = std::make_reverse_iterator(p); 454414a6a91122ed02d42745e14ebefb116e5bf773Marshall Clow constexpr auto it2 = std::make_reverse_iterator(p+5) += 5; 464414a6a91122ed02d42745e14ebefb116e5bf773Marshall Clow static_assert(it1 == it2, ""); 474414a6a91122ed02d42745e14ebefb116e5bf773Marshall Clow } 484414a6a91122ed02d42745e14ebefb116e5bf773Marshall Clow#endif 49bc8d3f97eb5c958007f2713238472e0c1c8fe02Howard Hinnant} 50