| //===----------------------------------------------------------------------===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| |
| // UNSUPPORTED: c++03, c++11, c++14, c++17 |
| // UNSUPPORTED: libcpp-no-concepts |
| // UNSUPPORTED: gcc-10 |
| |
| // template<indirectly_swappable<I> I2> |
| // friend constexpr void |
| // iter_swap(const counted_iterator& x, const counted_iterator<I2>& y) |
| // noexcept(noexcept(ranges::iter_swap(x.current, y.current))); |
| |
| #include <iterator> |
| |
| #include "test_macros.h" |
| #include "test_iterators.h" |
| |
| template<bool IsNoexcept> |
| class HasNoexceptIterSwap |
| { |
| int *it_; |
| |
| public: |
| typedef std::input_iterator_tag iterator_category; |
| typedef int value_type; |
| typedef typename std::iterator_traits<int *>::difference_type difference_type; |
| typedef int * pointer; |
| typedef int & reference; |
| |
| constexpr int *base() const {return it_;} |
| |
| HasNoexceptIterSwap() = default; |
| explicit constexpr HasNoexceptIterSwap(int *it) : it_(it) {} |
| |
| constexpr reference operator*() const {return *it_;} |
| |
| constexpr HasNoexceptIterSwap& operator++() {++it_; return *this;} |
| constexpr HasNoexceptIterSwap operator++(int) |
| {HasNoexceptIterSwap tmp(*this); ++(*this); return tmp;} |
| |
| friend void iter_swap( |
| const HasNoexceptIterSwap&, const HasNoexceptIterSwap&) noexcept(IsNoexcept) {} |
| }; |
| |
| constexpr bool test() { |
| int buffer[8] = {1, 2, 3, 4, 5, 6, 7, 8}; |
| |
| { |
| auto iter1 = cpp17_input_iterator<int*>(buffer); |
| auto commonIter1 = std::counted_iterator<decltype(iter1)>(iter1, 8); |
| auto commonIter2 = std::counted_iterator<decltype(iter1)>(iter1, 8); |
| for (auto i = 0; i < 4; ++i) ++commonIter2; |
| assert(*commonIter2 == 5); |
| std::ranges::iter_swap(commonIter1, commonIter2); |
| assert(*commonIter1 == 5); |
| assert(*commonIter2 == 1); |
| std::ranges::iter_swap(commonIter2, commonIter1); |
| } |
| { |
| auto iter1 = forward_iterator<int*>(buffer); |
| auto commonIter1 = std::counted_iterator<decltype(iter1)>(iter1, 8); |
| auto commonIter2 = std::counted_iterator<decltype(iter1)>(iter1, 8); |
| for (auto i = 0; i < 4; ++i) ++commonIter2; |
| assert(*commonIter2 == 5); |
| std::ranges::iter_swap(commonIter1, commonIter2); |
| assert(*commonIter1 == 5); |
| assert(*commonIter2 == 1); |
| std::ranges::iter_swap(commonIter2, commonIter1); |
| } |
| { |
| auto iter1 = random_access_iterator<int*>(buffer); |
| auto commonIter1 = std::counted_iterator<decltype(iter1)>(iter1, 8); |
| auto commonIter2 = std::counted_iterator<decltype(iter1)>(iter1, 8); |
| for (auto i = 0; i < 4; ++i) ++commonIter2; |
| assert(*commonIter2 == 5); |
| std::ranges::iter_swap(commonIter1, commonIter2); |
| assert(*commonIter1 == 5); |
| assert(*commonIter2 == 1); |
| std::ranges::iter_swap(commonIter2, commonIter1); |
| } |
| |
| // Test noexceptness. |
| { |
| static_assert( noexcept(std::ranges::iter_swap( |
| std::declval<std::counted_iterator<HasNoexceptIterSwap<true>>&>(), |
| std::declval<std::counted_iterator<HasNoexceptIterSwap<true>>&>() |
| ))); |
| static_assert(!noexcept(std::ranges::iter_swap( |
| std::declval<std::counted_iterator<HasNoexceptIterSwap<false>>&>(), |
| std::declval<std::counted_iterator<HasNoexceptIterSwap<false>>&>() |
| ))); |
| } |
| |
| return true; |
| } |
| |
| int main(int, char**) { |
| test(); |
| static_assert(test()); |
| |
| return 0; |
| } |