| 1 | //===----------------------------------------------------------------------===// |
| 2 | // |
| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| 4 | // See https://llvm.org/LICENSE.txt for license information. |
| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| 6 | // |
| 7 | //===----------------------------------------------------------------------===// |
| 8 | |
| 9 | // <string> |
| 10 | |
| 11 | // reverse_iterator rbegin(); // constexpr since C++20 |
| 12 | // const_reverse_iterator rbegin() const; // constexpr since C++20 |
| 13 | |
| 14 | #include <string> |
| 15 | #include <cassert> |
| 16 | |
| 17 | #include "test_macros.h" |
| 18 | #include "min_allocator.h" |
| 19 | |
| 20 | template <class S> |
| 21 | TEST_CONSTEXPR_CXX20 void test(S s) { |
| 22 | const S& cs = s; |
| 23 | typename S::reverse_iterator b = s.rbegin(); |
| 24 | typename S::const_reverse_iterator cb = cs.rbegin(); |
| 25 | if (!s.empty()) { |
| 26 | assert(*b == s.back()); |
| 27 | } |
| 28 | assert(b == cb); |
| 29 | } |
| 30 | |
| 31 | template <class S> |
| 32 | TEST_CONSTEXPR_CXX20 void test_string() { |
| 33 | test(S()); |
| 34 | test(S("123" )); |
| 35 | } |
| 36 | |
| 37 | TEST_CONSTEXPR_CXX20 bool test() { |
| 38 | test_string<std::string>(); |
| 39 | #if TEST_STD_VER >= 11 |
| 40 | test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char> > >(); |
| 41 | #endif |
| 42 | |
| 43 | return true; |
| 44 | } |
| 45 | |
| 46 | int main(int, char**) { |
| 47 | test(); |
| 48 | #if TEST_STD_VER > 17 |
| 49 | static_assert(test()); |
| 50 | #endif |
| 51 | |
| 52 | return 0; |
| 53 | } |
| 54 | |