53 lines · cpp
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-exception6//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++2014 15#include <algorithm>16#include <cassert>17 18#include "test_macros.h"19#include "test_iterators.h"20#include "type_algorithms.h"21 22struct 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 40TEST_CONSTEXPR_CXX20 bool test() {41 types::for_each(types::forward_iterator_list<int*>(), TestIterators());42 return true;43}44 45int main(int, char**) {46 test();47#if TEST_STD_VER >= 2048 static_assert(test());49#endif50 51 return 0;52}53