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 // <iterator>
11
12 // reverse_iterator
13
14 // template <RandomAccessIterator Iter1, RandomAccessIterator Iter2>
15 // requires HasGreater<Iter1, Iter2>
16 // constexpr bool
17 // operator<(const reverse_iterator<Iter1>& x, const reverse_iterator<Iter2>& y);
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 l,It r,bool x)29 test(It l, It r, bool x)
30 {
31 const std::reverse_iterator<It> r1(l);
32 const std::reverse_iterator<It> r2(r);
33 assert((r1 < r2) == x);
34 }
35
main()36 int main()
37 {
38 const char* s = "1234567890";
39 test(random_access_iterator<const char*>(s), random_access_iterator<const char*>(s), false);
40 test(random_access_iterator<const char*>(s), random_access_iterator<const char*>(s+1), false);
41 test(random_access_iterator<const char*>(s+1), random_access_iterator<const char*>(s), true);
42 test(s, s, false);
43 test(s, s+1, false);
44 test(s+1, s, true);
45
46 #if TEST_STD_VER > 14
47 {
48 constexpr const char *p = "123456789";
49 typedef std::reverse_iterator<const char *> RI;
50 constexpr RI it1 = std::make_reverse_iterator(p);
51 constexpr RI it2 = std::make_reverse_iterator(p);
52 constexpr RI it3 = std::make_reverse_iterator(p+1);
53 static_assert(!(it1 < it2), "");
54 static_assert(!(it1 < it3), "");
55 }
56 #endif
57 }
58