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 // constexpr const_iterator rend() const;
13
14 #include <string_view>
15 #include <cassert>
16 #include <cstddef>
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 e = s.rend();
26 typename S::const_reverse_iterator ce1 = cs.rend();
27 typename S::const_reverse_iterator ce2 = s.crend();
28
29 if (s.empty())
30 {
31 assert( e == s.rbegin());
32 assert(ce1 == cs.rbegin());
33 assert(ce2 == s.rbegin());
34 }
35 else
36 {
37 assert( e != s.rbegin());
38 assert(ce1 != cs.rbegin());
39 assert(ce2 != s.rbegin());
40 }
41
42 assert(static_cast<std::size_t>( e - s.rbegin()) == s.size());
43 assert(static_cast<std::size_t>(ce1 - cs.rbegin()) == cs.size());
44 assert(static_cast<std::size_t>(ce2 - s.crbegin()) == s.size());
45
46 assert( e == ce1);
47 assert( e == ce2);
48 assert(ce1 == ce2);
49 }
50
51
main()52 int main()
53 {
54 typedef std::string_view string_view;
55 #if defined(__cpp_lib_char8_t) && __cpp_lib_char8_t >= 201811L
56 typedef std::u8string_view u8string_view;
57 #endif
58 typedef std::u16string_view u16string_view;
59 typedef std::u32string_view u32string_view;
60 typedef std::wstring_view wstring_view;
61
62 test(string_view ());
63 test(u16string_view());
64 test(u32string_view());
65 test(wstring_view ());
66 test(string_view ( "123"));
67 test(wstring_view (L"123"));
68 #if defined(__cpp_lib_char8_t) && __cpp_lib_char8_t >= 201811L
69 test(u8string_view{u8"123"});
70 #endif
71 #if TEST_STD_VER >= 11
72 test(u16string_view{u"123"});
73 test(u32string_view{U"123"});
74 #endif
75
76 #if TEST_STD_VER > 14
77 {
78 constexpr string_view sv { "123", 3 };
79 #if defined(__cpp_lib_char8_t) && __cpp_lib_char8_t >= 201811L
80 constexpr u8string_view u8sv {u8"123", 3 };
81 #endif
82 constexpr u16string_view u16sv {u"123", 3 };
83 constexpr u32string_view u32sv {U"123", 3 };
84 constexpr wstring_view wsv {L"123", 3 };
85
86 static_assert ( *--sv.rend() == sv[0], "" );
87 #if defined(__cpp_lib_char8_t) && __cpp_lib_char8_t >= 201811L
88 static_assert ( *--u8sv.rend() == u8sv[0], "" );
89 #endif
90 static_assert ( *--u16sv.rend() == u16sv[0], "" );
91 static_assert ( *--u32sv.rend() == u32sv[0], "" );
92 static_assert ( *--wsv.rend() == wsv[0], "" );
93
94 static_assert ( *--sv.crend() == sv[0], "" );
95 #if defined(__cpp_lib_char8_t) && __cpp_lib_char8_t >= 201811L
96 static_assert ( *--u8sv.crend() == u8sv[0], "" );
97 #endif
98 static_assert ( *--u16sv.crend() == u16sv[0], "" );
99 static_assert ( *--u32sv.crend() == u32sv[0], "" );
100 static_assert ( *--wsv.crend() == wsv[0], "" );
101 }
102 #endif
103 }
104