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 <experimental/string_view>
15 #include <cassert>
16 
17 template <class S>
18 void
test(S s)19 test(S s)
20 {
21     const S& cs = s;
22     typename S::reverse_iterator b = s.rbegin();
23     typename S::const_reverse_iterator cb1 = cs.rbegin();
24     typename S::const_reverse_iterator cb2 = s.crbegin();
25     if (!s.empty())
26     {
27         const size_t last = s.size() - 1;
28         assert(   *b ==  s[last]);
29         assert(  &*b == &s[last]);
30         assert( *cb1 ==  s[last]);
31         assert(&*cb1 == &s[last]);
32         assert( *cb2 ==  s[last]);
33         assert(&*cb2 == &s[last]);
34 
35     }
36     assert(  b == cb1);
37     assert(  b == cb2);
38     assert(cb1 == cb2);
39 }
40 
41 
main()42 int main()
43 {
44     typedef std::experimental::string_view    string_view;
45     typedef std::experimental::u16string_view u16string_view;
46     typedef std::experimental::u32string_view u32string_view;
47     typedef std::experimental::wstring_view   wstring_view;
48 
49     test(string_view   ());
50     test(u16string_view());
51     test(u32string_view());
52     test(wstring_view  ());
53     test(string_view   ( "123"));
54     test(wstring_view  (L"123"));
55 #if __cplusplus >= 201103L
56     test(u16string_view{u"123"});
57     test(u32string_view{U"123"});
58 #endif
59 }
60