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> test(S 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 31 template <class S> test_string()32TEST_CONSTEXPR_CXX20 void test_string() { 33 test(S()); 34 test(S("123")); 35 } 36 test()37TEST_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 main(int,char **)46int main(int, char**) { 47 test(); 48 #if TEST_STD_VER > 17 49 static_assert(test()); 50 #endif 51 52 return 0; 53 } 54