| //===----------------------------------------------------------------------===// |
| // |
| // 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 |
| |
| // constexpr reverse_iterator& operator++(); |
| // |
| // constexpr in C++17 |
| |
| #include <iterator> |
| #include <cassert> |
| |
| #include "test_macros.h" |
| #include "test_iterators.h" |
| |
| template <class It> |
| void |
| test(It i, It x) |
| { |
| std::reverse_iterator<It> r(i); |
| std::reverse_iterator<It>& rr = ++r; |
| assert(r.base() == x); |
| assert(&rr == &r); |
| } |
| |
| int main(int, char**) |
| { |
| const char* s = "123"; |
| test(bidirectional_iterator<const char*>(s+1), bidirectional_iterator<const char*>(s)); |
| test(random_access_iterator<const char*>(s+1), random_access_iterator<const char*>(s)); |
| test(s+1, s); |
| |
| #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+1); |
| static_assert(it1 != it2, ""); |
| constexpr RI it3 = ++ std::make_reverse_iterator(p+1); |
| static_assert(it1 == it3, ""); |
| static_assert(it2 != it3, ""); |
| static_assert(*(++std::make_reverse_iterator(p+2)) == '1', ""); |
| } |
| #endif |
| |
| return 0; |
| } |