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 // 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
20 template <class S>
test(S s)21 void 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
main(int,char **)40 int main(int, char**) {
41 typedef std::string_view string_view;
42 #ifndef TEST_HAS_NO_CHAR8_T
43 typedef std::u8string_view u8string_view;
44 #endif
45 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_T
53 test(u8string_view{u8"123"});
54 #endif
55 #if TEST_STD_VER >= 11
56 test(u16string_view{u"123"});
57 test(u32string_view{U"123"});
58 #endif
59
60 #ifndef TEST_HAS_NO_WIDE_CHARACTERS
61 typedef std::wstring_view wstring_view;
62 test(wstring_view());
63 test(wstring_view(L"123"));
64 #endif
65
66 #if TEST_STD_VER > 14
67 {
68 constexpr string_view sv{"123", 3};
69 # ifndef TEST_HAS_NO_CHAR8_T
70 constexpr u8string_view u8sv{u8"123", 3};
71 # endif
72 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_T
77 static_assert(*u8sv.rbegin() == u8sv[2], "");
78 # endif
79 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_T
84 static_assert(*u8sv.crbegin() == u8sv[2], "");
85 # endif
86 static_assert(*u16sv.crbegin() == u16sv[2], "");
87 static_assert(*u32sv.crbegin() == u32sv[2], "");
88
89 # ifndef TEST_HAS_NO_WIDE_CHARACTERS
90 {
91 constexpr wstring_view wsv{L"123", 3};
92 static_assert(*wsv.rbegin() == wsv[2], "");
93 static_assert(*wsv.crbegin() == wsv[2], "");
94 }
95 # endif
96 }
97 #endif // TEST_STD_VER > 14
98
99 return 0;
100 }
101