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//===----------------------------------------------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
// <iterator>
// reverse_iterator
// requires RandomAccessIterator<Iter>
// constexpr reverse_iterator operator+(difference_type n) const;
//
// constexpr in C++17
#include <iterator>
#include <cassert>
#include "test_macros.h"
#include "test_iterators.h"
template <class It>
void
test(It i, typename std::iterator_traits<It>::difference_type n, It x)
{
const std::reverse_iterator<It> r(i);
std::reverse_iterator<It> rr = r + n;
assert(rr.base() == x);
}
int main()
{
const char* s = "1234567890";
test(random_access_iterator<const char*>(s+5), 5, random_access_iterator<const char*>(s));
test(s+5, 5, s);
#if TEST_STD_VER > 14
{
constexpr const char *p = "123456789";
typedef std::reverse_iterator<const char *> RI;
constexpr RI it1 = std::make_reverse_iterator(p);
constexpr RI it2 = std::make_reverse_iterator(p + 5);
constexpr RI it3 = it2 + 5;
static_assert(it1 != it2, "");
static_assert(it1 == it3, "");
static_assert(it2 != it3, "");
}
#endif
}
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