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>
21 void
test(S s)22 test(S s)
23 {
24 const S& cs = s;
25 typename S::reverse_iterator b = s.rbegin();
26 typename S::const_reverse_iterator cb1 = cs.rbegin();
27 typename S::const_reverse_iterator cb2 = s.crbegin();
28 if (!s.empty())
29 {
30 const size_t last = s.size() - 1;
31 assert( *b == s[last]);
32 assert( &*b == &s[last]);
33 assert( *cb1 == s[last]);
34 assert(&*cb1 == &s[last]);
35 assert( *cb2 == s[last]);
36 assert(&*cb2 == &s[last]);
37
38 }
39 assert( b == cb1);
40 assert( b == cb2);
41 assert(cb1 == cb2);
42 }
43
44
main(int,char **)45 int main(int, char**)
46 {
47 typedef std::string_view string_view;
48 #if defined(__cpp_lib_char8_t) && __cpp_lib_char8_t >= 201811L
49 typedef std::u8string_view u8string_view;
50 #endif
51 typedef std::u16string_view u16string_view;
52 typedef std::u32string_view u32string_view;
53
54 test(string_view ());
55 test(u16string_view());
56 test(u32string_view());
57 test(string_view ( "123"));
58 #if defined(__cpp_lib_char8_t) && __cpp_lib_char8_t >= 201811L
59 test(u8string_view{u8"123"});
60 #endif
61 #if TEST_STD_VER >= 11
62 test(u16string_view{u"123"});
63 test(u32string_view{U"123"});
64 #endif
65
66 #ifndef TEST_HAS_NO_WIDE_CHARACTERS
67 typedef std::wstring_view wstring_view;
68 test(wstring_view ());
69 test(wstring_view (L"123"));
70 #endif
71
72 #if TEST_STD_VER > 14
73 {
74 constexpr string_view sv { "123", 3 };
75 #if defined(__cpp_lib_char8_t) && __cpp_lib_char8_t >= 201811L
76 constexpr u8string_view u8sv {u8"123", 3 };
77 #endif
78 constexpr u16string_view u16sv {u"123", 3 };
79 constexpr u32string_view u32sv {U"123", 3 };
80
81 static_assert ( *sv.rbegin() == sv[2], "" );
82 #if defined(__cpp_lib_char8_t) && __cpp_lib_char8_t >= 201811L
83 static_assert ( *u8sv.rbegin() == u8sv[2], "" );
84 #endif
85 static_assert ( *u16sv.rbegin() == u16sv[2], "" );
86 static_assert ( *u32sv.rbegin() == u32sv[2], "" );
87
88 static_assert ( *sv.crbegin() == sv[2], "" );
89 #if defined(__cpp_lib_char8_t) && __cpp_lib_char8_t >= 201811L
90 static_assert ( *u8sv.crbegin() == u8sv[2], "" );
91 #endif
92 static_assert ( *u16sv.crbegin() == u16sv[2], "" );
93 static_assert ( *u32sv.crbegin() == u32sv[2], "" );
94
95 #ifndef TEST_HAS_NO_WIDE_CHARACTERS
96 {
97 constexpr wstring_view wsv {L"123", 3 };
98 static_assert ( *wsv.rbegin() == wsv[2], "" );
99 static_assert ( *wsv.crbegin() == wsv[2], "" );
100 }
101 #endif
102 }
103 #endif // TEST_STD_VER > 14
104
105 return 0;
106 }
107