| //===----------------------------------------------------------------------===// |
| // |
| // 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 |
| // |
| //===----------------------------------------------------------------------===// |
| |
| // <iterator> |
| |
| // reverse_iterator |
| |
| // template <BidirectionalIterator Iter1, BidirectionalIterator Iter2> |
| // requires HasEqualTo<Iter1, Iter2> |
| // constexpr bool |
| // operator==(const reverse_iterator<Iter1>& x, const reverse_iterator<Iter2>& y); |
| // |
| // constexpr in C++17 |
| |
| #include <iterator> |
| #include <cassert> |
| |
| #include "test_macros.h" |
| #include "test_iterators.h" |
| |
| template <class It> |
| void |
| test(It l, It r, bool x) |
| { |
| const std::reverse_iterator<It> r1(l); |
| const std::reverse_iterator<It> r2(r); |
| assert((r1 == r2) == x); |
| } |
| |
| int main(int, char**) |
| { |
| const char* s = "1234567890"; |
| test(bidirectional_iterator<const char*>(s), bidirectional_iterator<const char*>(s), true); |
| test(bidirectional_iterator<const char*>(s), bidirectional_iterator<const char*>(s+1), false); |
| test(random_access_iterator<const char*>(s), random_access_iterator<const char*>(s), true); |
| test(random_access_iterator<const char*>(s), random_access_iterator<const char*>(s+1), false); |
| test(s, s, true); |
| test(s, s+1, false); |
| |
| #if TEST_STD_VER > 14 |
| { |
| constexpr const char *p = "123456789"; |
| typedef std::reverse_iterator<const char *> RI; |
| constexpr RI it1 = std::make_reverse_iterator(p); |
| constexpr RI it2 = std::make_reverse_iterator(p); |
| constexpr RI it3 = std::make_reverse_iterator(p+1); |
| static_assert( (it1 == it2), ""); |
| static_assert(!(it1 == it3), ""); |
| } |
| #endif |
| |
| |
| return 0; |
| } |