blob: 7bd699bb9ead9bfb4040861323b7f181be488437 [file] [log] [blame]
//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
// <iterator>
// reverse_iterator
// template <BidirectionalIterator Iter1, BidirectionalIterator Iter2>
// requires HasEqualTo<Iter1, Iter2>
// constexpr bool
// operator==(const reverse_iterator<Iter1>& x, const reverse_iterator<Iter2>& y);
//
// constexpr in C++17
#include <iterator>
#include <cassert>
#include "test_macros.h"
#include "test_iterators.h"
template <class It>
void
test(It l, It r, bool x)
{
const std::reverse_iterator<It> r1(l);
const std::reverse_iterator<It> r2(r);
assert((r1 == r2) == x);
}
int main(int, char**)
{
const char* s = "1234567890";
test(bidirectional_iterator<const char*>(s), bidirectional_iterator<const char*>(s), true);
test(bidirectional_iterator<const char*>(s), bidirectional_iterator<const char*>(s+1), false);
test(random_access_iterator<const char*>(s), random_access_iterator<const char*>(s), true);
test(random_access_iterator<const char*>(s), random_access_iterator<const char*>(s+1), false);
test(s, s, true);
test(s, s+1, false);
#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);
constexpr RI it3 = std::make_reverse_iterator(p+1);
static_assert( (it1 == it2), "");
static_assert(!(it1 == it3), "");
}
#endif
return 0;
}