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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>
// move_iterator
// template <RandomAccessIterator Iter1, RandomAccessIterator Iter2>
// requires HasMinus<Iter1, Iter2>
// auto
// operator-(const move_iterator<Iter1>& x, const move_iterator<Iter2>& y)
// -> decltype(x.base() - y.base());
//
// 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, typename std::iterator_traits<It>::difference_type x)
{
const std::move_iterator<It> r1(l);
const std::move_iterator<It> r2(r);
assert(r1 - r2 == x);
}
int main()
{
char s[] = "1234567890";
test(random_access_iterator<char*>(s+5), random_access_iterator<char*>(s), 5);
test(s+5, s, 5);
#if TEST_STD_VER > 14
{
constexpr const char *p = "123456789";
typedef std::move_iterator<const char *> MI;
constexpr MI it1 = std::make_move_iterator(p);
constexpr MI it2 = std::make_move_iterator(p+1);
static_assert( it1 - it2 == -1, "");
static_assert( it2 - it1 == 1, "");
}
#endif
}
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