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_view>
10
11 // const_iterator rbegin() const;
12
13 #include <string_view>
14 #include <cassert>
15
16 #include "test_macros.h"
17
18 template <class S>
19 void
test(S s)20 test(S s)
21 {
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 {
28 const size_t last = s.size() - 1;
29 assert( *b == s[last]);
30 assert( &*b == &s[last]);
31 assert( *cb1 == s[last]);
32 assert(&*cb1 == &s[last]);
33 assert( *cb2 == s[last]);
34 assert(&*cb2 == &s[last]);
35
36 }
37 assert( b == cb1);
38 assert( b == cb2);
39 assert(cb1 == cb2);
40 }
41
42
main(int,char **)43 int main(int, char**)
44 {
45 typedef std::string_view string_view;
46 #if defined(__cpp_lib_char8_t) && __cpp_lib_char8_t >= 201811L
47 typedef std::u8string_view u8string_view;
48 #endif
49 typedef std::u16string_view u16string_view;
50 typedef std::u32string_view u32string_view;
51 typedef std::wstring_view wstring_view;
52
53 test(string_view ());
54 test(u16string_view());
55 test(u32string_view());
56 test(wstring_view ());
57 test(string_view ( "123"));
58 test(wstring_view (L"123"));
59 #if defined(__cpp_lib_char8_t) && __cpp_lib_char8_t >= 201811L
60 test(u8string_view{u8"123"});
61 #endif
62 #if TEST_STD_VER >= 11
63 test(u16string_view{u"123"});
64 test(u32string_view{U"123"});
65 #endif
66
67 #if TEST_STD_VER > 14
68 {
69 constexpr string_view sv { "123", 3 };
70 #if defined(__cpp_lib_char8_t) && __cpp_lib_char8_t >= 201811L
71 constexpr u8string_view u8sv {u8"123", 3 };
72 #endif
73 constexpr u16string_view u16sv {u"123", 3 };
74 constexpr u32string_view u32sv {U"123", 3 };
75 constexpr wstring_view wsv {L"123", 3 };
76
77 static_assert ( *sv.rbegin() == sv[2], "" );
78 #if defined(__cpp_lib_char8_t) && __cpp_lib_char8_t >= 201811L
79 static_assert ( *u8sv.rbegin() == u8sv[2], "" );
80 #endif
81 static_assert ( *u16sv.rbegin() == u16sv[2], "" );
82 static_assert ( *u32sv.rbegin() == u32sv[2], "" );
83 static_assert ( *wsv.rbegin() == wsv[2], "" );
84
85 static_assert ( *sv.crbegin() == sv[2], "" );
86 #if defined(__cpp_lib_char8_t) && __cpp_lib_char8_t >= 201811L
87 static_assert ( *u8sv.crbegin() == u8sv[2], "" );
88 #endif
89 static_assert ( *u16sv.crbegin() == u16sv[2], "" );
90 static_assert ( *u32sv.crbegin() == u32sv[2], "" );
91 static_assert ( *wsv.crbegin() == wsv[2], "" );
92 }
93 #endif
94
95 return 0;
96 }
97