| //===----------------------------------------------------------------------===// |
| // |
| // 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 |
| |
| // requires RandomAccessIterator<Iter> |
| // move_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::move_iterator<It> r(i); |
| std::move_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::move_iterator<const char *> MI; |
| constexpr MI it1 = std::make_move_iterator(p); |
| constexpr MI it2 = std::make_move_iterator(p + 5); |
| constexpr MI it3 = it2 - 5; |
| static_assert(it1 != it2, ""); |
| static_assert(it1 == it3, ""); |
| static_assert(it2 != it3, ""); |
| } |
| #endif |
| } |
