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
27template <class It>
28void
29test(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
36int main()
37{
38    const char* s = "1234567890";
39    test(random_access_iterator<const char*>(s), random_access_iterator<const char*>(s), true);
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, true);
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