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 // UNSUPPORTED: c++98, c++03, c++11
11 // <iterator>
12 
13 // reverse_iterator
14 
15 // template <class Iterator>
16 //   constexpr reverse_iterator<Iterator>
17 //     make_reverse_iterator(Iterator i);
18 //
19 //   constexpr in C++17
20 
21 #include <iterator>
22 #include <cassert>
23 
24 #include "test_macros.h"
25 #include "test_iterators.h"
26 
27 template <class It>
28 void
test(It i)29 test(It i)
30 {
31     const std::reverse_iterator<It> r = std::make_reverse_iterator(i);
32     assert(r.base() == i);
33 }
34 
main()35 int main()
36 {
37     const char* s = "1234567890";
38     random_access_iterator<const char*>b(s);
39     random_access_iterator<const char*>e(s+10);
40     while ( b != e )
41         test ( b++ );
42 
43 #if TEST_STD_VER > 14
44     {
45         constexpr const char *p = "123456789";
46         constexpr auto it1 = std::make_reverse_iterator(p);
47         static_assert(it1.base() == p, "");
48     }
49 #endif
50 }
51 
52