1 //===----------------------------------------------------------------------===//
2 //
3 // The LLVM Compiler Infrastructure
4 //
5 // This file is dual licensed under the MIT and the University of Illinois Open
6 // Source Licenses. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9
10 // <string_view>
11
12 // const_iterator rbegin() const;
13
14 #include <string_view>
15 #include <cassert>
16
17 #include "test_macros.h"
18
19 template <class S>
20 void
test(S s)21 test(S s)
22 {
23 const S& cs = s;
24 typename S::reverse_iterator b = s.rbegin();
25 typename S::const_reverse_iterator cb1 = cs.rbegin();
26 typename S::const_reverse_iterator cb2 = s.crbegin();
27 if (!s.empty())
28 {
29 const size_t last = s.size() - 1;
30 assert( *b == s[last]);
31 assert( &*b == &s[last]);
32 assert( *cb1 == s[last]);
33 assert(&*cb1 == &s[last]);
34 assert( *cb2 == s[last]);
35 assert(&*cb2 == &s[last]);
36
37 }
38 assert( b == cb1);
39 assert( b == cb2);
40 assert(cb1 == cb2);
41 }
42
43
main()44 int main()
45 {
46 typedef std::string_view string_view;
47 #if defined(__cpp_lib_char8_t) && __cpp_lib_char8_t >= 201811L
48 typedef std::u8string_view u8string_view;
49 #endif
50 typedef std::u16string_view u16string_view;
51 typedef std::u32string_view u32string_view;
52 typedef std::wstring_view wstring_view;
53
54 test(string_view ());
55 test(u16string_view());
56 test(u32string_view());
57 test(wstring_view ());
58 test(string_view ( "123"));
59 test(wstring_view (L"123"));
60 #if defined(__cpp_lib_char8_t) && __cpp_lib_char8_t >= 201811L
61 test(u8string_view{u8"123"});
62 #endif
63 #if TEST_STD_VER >= 11
64 test(u16string_view{u"123"});
65 test(u32string_view{U"123"});
66 #endif
67
68 #if TEST_STD_VER > 14
69 {
70 constexpr string_view sv { "123", 3 };
71 #if defined(__cpp_lib_char8_t) && __cpp_lib_char8_t >= 201811L
72 constexpr u8string_view u8sv {u8"123", 3 };
73 #endif
74 constexpr u16string_view u16sv {u"123", 3 };
75 constexpr u32string_view u32sv {U"123", 3 };
76 constexpr wstring_view wsv {L"123", 3 };
77
78 static_assert ( *sv.rbegin() == sv[2], "" );
79 #if defined(__cpp_lib_char8_t) && __cpp_lib_char8_t >= 201811L
80 static_assert ( *u8sv.rbegin() == u8sv[2], "" );
81 #endif
82 static_assert ( *u16sv.rbegin() == u16sv[2], "" );
83 static_assert ( *u32sv.rbegin() == u32sv[2], "" );
84 static_assert ( *wsv.rbegin() == wsv[2], "" );
85
86 static_assert ( *sv.crbegin() == sv[2], "" );
87 #if defined(__cpp_lib_char8_t) && __cpp_lib_char8_t >= 201811L
88 static_assert ( *u8sv.crbegin() == u8sv[2], "" );
89 #endif
90 static_assert ( *u16sv.crbegin() == u16sv[2], "" );
91 static_assert ( *u32sv.crbegin() == u32sv[2], "" );
92 static_assert ( *wsv.crbegin() == wsv[2], "" );
93 }
94 #endif
95 }
96