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 // constexpr const_iterator rend() const;
12
13 #include <string_view>
14 #include <cassert>
15 #include <cstddef>
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 e = s.rend();
25 typename S::const_reverse_iterator ce1 = cs.rend();
26 typename S::const_reverse_iterator ce2 = s.crend();
27
28 if (s.empty())
29 {
30 assert( e == s.rbegin());
31 assert(ce1 == cs.rbegin());
32 assert(ce2 == s.rbegin());
33 }
34 else
35 {
36 assert( e != s.rbegin());
37 assert(ce1 != cs.rbegin());
38 assert(ce2 != s.rbegin());
39 }
40
41 assert(static_cast<std::size_t>( e - s.rbegin()) == s.size());
42 assert(static_cast<std::size_t>(ce1 - cs.rbegin()) == cs.size());
43 assert(static_cast<std::size_t>(ce2 - s.crbegin()) == s.size());
44
45 assert( e == ce1);
46 assert( e == ce2);
47 assert(ce1 == ce2);
48 }
49
50
main(int,char **)51 int main(int, char**)
52 {
53 typedef std::string_view string_view;
54 #if defined(__cpp_lib_char8_t) && __cpp_lib_char8_t >= 201811L
55 typedef std::u8string_view u8string_view;
56 #endif
57 typedef std::u16string_view u16string_view;
58 typedef std::u32string_view u32string_view;
59 typedef std::wstring_view wstring_view;
60
61 test(string_view ());
62 test(u16string_view());
63 test(u32string_view());
64 test(wstring_view ());
65 test(string_view ( "123"));
66 test(wstring_view (L"123"));
67 #if defined(__cpp_lib_char8_t) && __cpp_lib_char8_t >= 201811L
68 test(u8string_view{u8"123"});
69 #endif
70 #if TEST_STD_VER >= 11
71 test(u16string_view{u"123"});
72 test(u32string_view{U"123"});
73 #endif
74
75 #if TEST_STD_VER > 14
76 {
77 constexpr string_view sv { "123", 3 };
78 #if defined(__cpp_lib_char8_t) && __cpp_lib_char8_t >= 201811L
79 constexpr u8string_view u8sv {u8"123", 3 };
80 #endif
81 constexpr u16string_view u16sv {u"123", 3 };
82 constexpr u32string_view u32sv {U"123", 3 };
83 constexpr wstring_view wsv {L"123", 3 };
84
85 static_assert ( *--sv.rend() == sv[0], "" );
86 #if defined(__cpp_lib_char8_t) && __cpp_lib_char8_t >= 201811L
87 static_assert ( *--u8sv.rend() == u8sv[0], "" );
88 #endif
89 static_assert ( *--u16sv.rend() == u16sv[0], "" );
90 static_assert ( *--u32sv.rend() == u32sv[0], "" );
91 static_assert ( *--wsv.rend() == wsv[0], "" );
92
93 static_assert ( *--sv.crend() == sv[0], "" );
94 #if defined(__cpp_lib_char8_t) && __cpp_lib_char8_t >= 201811L
95 static_assert ( *--u8sv.crend() == u8sv[0], "" );
96 #endif
97 static_assert ( *--u16sv.crend() == u16sv[0], "" );
98 static_assert ( *--u32sv.crend() == u32sv[0], "" );
99 static_assert ( *--wsv.crend() == wsv[0], "" );
100 }
101 #endif
102
103 return 0;
104 }
105