101 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// UNSUPPORTED: !stdlib=libc++ && (c++03 || c++11 || c++14)10 11// <string_view>12 13// const_iterator rbegin() const;14 15#include <string_view>16#include <cassert>17 18#include "test_macros.h"19 20template <class S>21void test(S s) {22 const S& cs = s;23 typename S::reverse_iterator b = s.rbegin();24 typename S::const_reverse_iterator cb1 = cs.rbegin();25 typename S::const_reverse_iterator cb2 = s.crbegin();26 if (!s.empty()) {27 const std::size_t last = s.size() - 1;28 assert(*b == s[last]);29 assert(&*b == &s[last]);30 assert(*cb1 == s[last]);31 assert(&*cb1 == &s[last]);32 assert(*cb2 == s[last]);33 assert(&*cb2 == &s[last]);34 }35 assert(b == cb1);36 assert(b == cb2);37 assert(cb1 == cb2);38}39 40int main(int, char**) {41 typedef std::string_view string_view;42#ifndef TEST_HAS_NO_CHAR8_T43 typedef std::u8string_view u8string_view;44#endif45 typedef std::u16string_view u16string_view;46 typedef std::u32string_view u32string_view;47 48 test(string_view());49 test(u16string_view());50 test(u32string_view());51 test(string_view("123"));52#ifndef TEST_HAS_NO_CHAR8_T53 test(u8string_view{u8"123"});54#endif55#if TEST_STD_VER >= 1156 test(u16string_view{u"123"});57 test(u32string_view{U"123"});58#endif59 60#ifndef TEST_HAS_NO_WIDE_CHARACTERS61 typedef std::wstring_view wstring_view;62 test(wstring_view());63 test(wstring_view(L"123"));64#endif65 66#if TEST_STD_VER > 1467 {68 constexpr string_view sv{"123", 3};69# ifndef TEST_HAS_NO_CHAR8_T70 constexpr u8string_view u8sv{u8"123", 3};71# endif72 constexpr u16string_view u16sv{u"123", 3};73 constexpr u32string_view u32sv{U"123", 3};74 75 static_assert(*sv.rbegin() == sv[2], "");76# ifndef TEST_HAS_NO_CHAR8_T77 static_assert(*u8sv.rbegin() == u8sv[2], "");78# endif79 static_assert(*u16sv.rbegin() == u16sv[2], "");80 static_assert(*u32sv.rbegin() == u32sv[2], "");81 82 static_assert(*sv.crbegin() == sv[2], "");83# ifndef TEST_HAS_NO_CHAR8_T84 static_assert(*u8sv.crbegin() == u8sv[2], "");85# endif86 static_assert(*u16sv.crbegin() == u16sv[2], "");87 static_assert(*u32sv.crbegin() == u32sv[2], "");88 89# ifndef TEST_HAS_NO_WIDE_CHARACTERS90 {91 constexpr wstring_view wsv{L"123", 3};92 static_assert(*wsv.rbegin() == wsv[2], "");93 static_assert(*wsv.crbegin() == wsv[2], "");94 }95# endif96 }97#endif // TEST_STD_VER > 1498 99 return 0;100}101