54 lines · cpp
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-exception6//7//===----------------------------------------------------------------------===//8 9// <string>10 11// reverse_iterator rbegin(); // constexpr since C++2012// const_reverse_iterator rbegin() const; // constexpr since C++2013 14#include <string>15#include <cassert>16 17#include "test_macros.h"18#include "min_allocator.h"19 20template <class S>21TEST_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 31template <class S>32TEST_CONSTEXPR_CXX20 void test_string() {33 test(S());34 test(S("123"));35}36 37TEST_CONSTEXPR_CXX20 bool test() {38 test_string<std::string>();39#if TEST_STD_VER >= 1140 test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char> > >();41#endif42 43 return true;44}45 46int main(int, char**) {47 test();48#if TEST_STD_VER > 1749 static_assert(test());50#endif51 52 return 0;53}54