51 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// const_reverse_iterator crbegin() const; // constexpr since C++2012 13#include <string>14#include <cassert>15 16#include "test_macros.h"17#include "min_allocator.h"18 19template <class S>20TEST_CONSTEXPR_CXX20 void test(const S& s) {21 typename S::const_reverse_iterator cb = s.crbegin();22 if (!s.empty()) {23 assert(*cb == s.back());24 }25 assert(cb == s.rbegin());26}27 28template <class S>29TEST_CONSTEXPR_CXX20 void test_string() {30 test(S());31 test(S("123"));32}33 34TEST_CONSTEXPR_CXX20 bool test() {35 test_string<std::string>();36#if TEST_STD_VER >= 1137 test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char> > >();38#endif39 40 return true;41}42 43int main(int, char**) {44 test();45#if TEST_STD_VER > 1746 static_assert(test());47#endif48 49 return 0;50}51