| //===----------------------------------------------------------------------===// |
| // |
| // 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 |
| // |
| //===----------------------------------------------------------------------===// |
| |
| // <iterator> |
| |
| // reverse_iterator |
| |
| // Test nested types and data member: |
| |
| // template <BidirectionalIterator Iter> |
| // class reverse_iterator { |
| // protected: |
| // Iter current; |
| // public: |
| // iterator<typename iterator_traits<Iterator>::iterator_category, |
| // typename iterator_traits<Iterator>::value_type, |
| // typename iterator_traits<Iterator>::difference_type, |
| // typename iterator_traits<Iterator>::pointer, |
| // typename iterator_traits<Iterator>::reference> { |
| // }; |
| |
| #include <iterator> |
| #include <type_traits> |
| |
| #include "test_macros.h" |
| #include "test_iterators.h" |
| |
| template <class It> |
| struct find_current |
| : private std::reverse_iterator<It> |
| { |
| void test() { (void)this->current; } |
| }; |
| |
| template <class It> |
| void test() { |
| typedef std::reverse_iterator<It> R; |
| typedef std::iterator_traits<It> T; |
| find_current<It> q; q.test(); // Just test that we can access `.current` from derived classes |
| static_assert((std::is_same<typename R::iterator_type, It>::value), ""); |
| static_assert((std::is_same<typename R::value_type, typename T::value_type>::value), ""); |
| static_assert((std::is_same<typename R::difference_type, typename T::difference_type>::value), ""); |
| static_assert((std::is_same<typename R::reference, typename T::reference>::value), ""); |
| static_assert((std::is_same<typename R::pointer, typename std::iterator_traits<It>::pointer>::value), ""); |
| |
| #if TEST_STD_VER <= 14 |
| typedef std::iterator<typename T::iterator_category, typename T::value_type> iterator_base; |
| static_assert((std::is_base_of<iterator_base, R>::value), ""); |
| #endif |
| #if TEST_STD_VER > 17 |
| if constexpr (std::is_same_v<typename T::iterator_category, std::contiguous_iterator_tag>) { |
| static_assert((std::is_same<typename R::iterator_category, std::random_access_iterator_tag>::value), ""); |
| } else { |
| static_assert((std::is_same<typename R::iterator_category, typename T::iterator_category>::value), ""); |
| } |
| #else |
| static_assert((std::is_same<typename R::iterator_category, typename T::iterator_category>::value), ""); |
| #endif |
| } |
| |
| #if TEST_STD_VER > 17 |
| |
| struct FooIter { |
| using iterator_category = std::bidirectional_iterator_tag; |
| using value_type = void*; |
| using difference_type = void*; |
| using pointer = void*; |
| using reference = int&; |
| int& operator*() const; |
| }; |
| template <> |
| struct std::indirectly_readable_traits<FooIter> { |
| using value_type = int; |
| }; |
| template <> |
| struct std::incrementable_traits<FooIter> { |
| using difference_type = char; |
| }; |
| |
| // Not using `FooIter::value_type`. |
| static_assert(std::is_same_v<typename std::reverse_iterator<FooIter>::value_type, int>); |
| // Not using `FooIter::difference_type`. |
| static_assert(std::is_same_v<typename std::reverse_iterator<FooIter>::difference_type, char>); |
| |
| #endif |
| |
| struct BarIter { |
| bool& operator*() const; |
| }; |
| template <> |
| struct std::iterator_traits<BarIter> { |
| using difference_type = char; |
| using value_type = char; |
| using pointer = char*; |
| using reference = char&; |
| using iterator_category = std::bidirectional_iterator_tag; |
| }; |
| |
| #if TEST_STD_VER > 17 |
| static_assert(std::is_same_v<typename std::reverse_iterator<BarIter>::reference, bool&>); |
| #else |
| static_assert(std::is_same<typename std::reverse_iterator<BarIter>::reference, char&>::value, ""); |
| #endif |
| |
| void test_all() { |
| test<bidirectional_iterator<char*> >(); |
| test<random_access_iterator<char*> >(); |
| test<char*>(); |
| |
| #if TEST_STD_VER > 17 |
| test<contiguous_iterator<char*>>(); |
| static_assert(std::is_same_v<typename std::reverse_iterator<bidirectional_iterator<char*>>::iterator_concept, std::bidirectional_iterator_tag>); |
| static_assert(std::is_same_v<typename std::reverse_iterator<random_access_iterator<char*>>::iterator_concept, std::random_access_iterator_tag>); |
| static_assert(std::is_same_v<typename std::reverse_iterator<cpp20_random_access_iterator<char*>>::iterator_concept, std::random_access_iterator_tag>); |
| static_assert(std::is_same_v<typename std::reverse_iterator<contiguous_iterator<char*>>::iterator_concept, std::random_access_iterator_tag>); |
| static_assert(std::is_same_v<typename std::reverse_iterator<char*>::iterator_concept, std::random_access_iterator_tag>); |
| #endif |
| } |