| //===----------------------------------------------------------------------===// |
| // |
| // 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<common_with<I> I2> |
| // friend constexpr bool operator==( |
| // const counted_iterator& x, const counted_iterator<I2>& y); |
| // friend constexpr bool operator==( |
| // const counted_iterator& x, default_sentinel_t); |
| |
| #include <iterator> |
| |
| #include "test_macros.h" |
| #include "test_iterators.h" |
| |
| // This iterator is common_with forward_iterator but NOT comparable with it. |
| template <class It> |
| class CommonWithForwardIter |
| { |
| It it_; |
| |
| public: |
| typedef std::input_iterator_tag iterator_category; |
| typedef typename std::iterator_traits<It>::value_type value_type; |
| typedef typename std::iterator_traits<It>::difference_type difference_type; |
| typedef It pointer; |
| typedef typename std::iterator_traits<It>::reference reference; |
| |
| constexpr It base() const {return it_;} |
| |
| CommonWithForwardIter() = default; |
| explicit constexpr CommonWithForwardIter(It it) : it_(it) {} |
| constexpr CommonWithForwardIter(const forward_iterator<It>& it) : it_(it.base()) {} |
| |
| constexpr reference operator*() const {return *it_;} |
| |
| constexpr CommonWithForwardIter& operator++() {++it_; return *this;} |
| constexpr CommonWithForwardIter operator++(int) |
| {CommonWithForwardIter tmp(*this); ++(*this); return tmp;} |
| }; |
| |
| struct InputOrOutputArchetype { |
| using difference_type = int; |
| |
| int *ptr; |
| |
| constexpr int operator*() { return *ptr; } |
| constexpr void operator++(int) { ++ptr; } |
| constexpr InputOrOutputArchetype& operator++() { ++ptr; return *this; } |
| }; |
| |
| constexpr bool test() { |
| int buffer[8] = {1, 2, 3, 4, 5, 6, 7, 8}; |
| |
| { |
| { |
| std::counted_iterator iter1(forward_iterator<int*>(buffer), 8); |
| std::counted_iterator iter2(CommonWithForwardIter<int*>(buffer), 8); |
| |
| assert(iter1 == iter2); |
| assert(iter2 == iter1); |
| ++iter1; |
| assert(iter1 != iter2); |
| assert(iter2 != iter1); |
| } |
| } |
| |
| { |
| { |
| std::counted_iterator iter(cpp20_input_iterator<int*>(buffer), 8); |
| |
| assert(iter != std::default_sentinel); |
| assert(std::default_sentinel == std::ranges::next(std::move(iter), 8)); |
| } |
| { |
| std::counted_iterator iter(forward_iterator<int*>(buffer), 8); |
| |
| assert(iter != std::default_sentinel); |
| assert(std::default_sentinel == std::ranges::next(iter, 8)); |
| } |
| { |
| std::counted_iterator iter(random_access_iterator<int*>(buffer), 8); |
| |
| assert(iter != std::default_sentinel); |
| assert(std::default_sentinel == std::ranges::next(iter, 8)); |
| } |
| { |
| std::counted_iterator iter(InputOrOutputArchetype{buffer}, 8); |
| |
| assert(iter != std::default_sentinel); |
| assert(std::default_sentinel == std::ranges::next(iter, 8)); |
| } |
| } |
| |
| |
| return true; |
| } |
| |
| int main(int, char**) { |
| test(); |
| static_assert(test()); |
| |
| return 0; |
| } |