| 1 | //===----------------------------------------------------------------------===// |
| 2 | // |
| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| 4 | // See https://llvm.org/LICENSE.txt for license information. |
| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| 6 | // |
| 7 | //===----------------------------------------------------------------------===// |
| 8 | |
| 9 | // <algorithm> |
| 10 | |
| 11 | // template<Iterator Iter1, Iterator Iter2> |
| 12 | // requires HasSwap<Iter1::reference, Iter2::reference> |
| 13 | // void iter_swap(Iter1 a, Iter2 b); // constexpr since C++20 |
| 14 | |
| 15 | #include <algorithm> |
| 16 | #include <cassert> |
| 17 | |
| 18 | #include "test_macros.h" |
| 19 | #include "test_iterators.h" |
| 20 | #include "type_algorithms.h" |
| 21 | |
| 22 | struct TestIterators { |
| 23 | template <class Iter> |
| 24 | TEST_CONSTEXPR_CXX20 void operator()() { |
| 25 | types::for_each(types::forward_iterator_list<int*>(), TestImpl<Iter>()); |
| 26 | } |
| 27 | |
| 28 | template <class Iter1> |
| 29 | struct TestImpl { |
| 30 | template <class Iter2> |
| 31 | TEST_CONSTEXPR_CXX20 void operator()() { |
| 32 | int i = 1; |
| 33 | int j = 2; |
| 34 | std::iter_swap(Iter1(&i), Iter2(&j)); |
| 35 | assert(i == 2 && j == 1); |
| 36 | } |
| 37 | }; |
| 38 | }; |
| 39 | |
| 40 | TEST_CONSTEXPR_CXX20 bool test() { |
| 41 | types::for_each(types::forward_iterator_list<int*>(), TestIterators()); |
| 42 | return true; |
| 43 | } |
| 44 | |
| 45 | int main(int, char**) { |
| 46 | test(); |
| 47 | #if TEST_STD_VER >= 20 |
| 48 | static_assert(test()); |
| 49 | #endif |
| 50 | |
| 51 | return 0; |
| 52 | } |
| 53 | |