| //===----------------------------------------------------------------------===// |
| // |
| // 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 |
| } |
