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 // UNSUPPORTED: c++03, c++11, c++14, c++17 10 11 // using iterator_category = If< 12 // derived_from<typename iterator_traits<iterator_t<Base>>::iterator_category, forward_iterator_tag>, 13 // forward_iterator_tag, 14 // typename iterator_traits<iterator_t<Base>>::iterator_category 15 // >; 16 // using iterator_concept = typename outer-iterator<Const>::iterator_concept; 17 // using value_type = range_value_t<Base>; 18 // using difference_type = range_difference_t<Base>; 19 20 #include <ranges> 21 22 #include <concepts> 23 #include <iterator> 24 #include "../types.h" 25 26 template <class Range, class Pattern> 27 using OuterIter = std::ranges::iterator_t<std::ranges::lazy_split_view<Range, Pattern>>; 28 template <class Range, class Pattern> 29 using InnerIter = std::ranges::iterator_t<decltype(*OuterIter<Range, Pattern>())>; 30 31 // iterator_concept 32 33 static_assert(std::same_as<typename InnerIter<ForwardView, ForwardView>::iterator_concept, 34 typename OuterIter<ForwardView, ForwardView>::iterator_concept>); 35 static_assert(std::same_as<typename InnerIter<InputView, ForwardTinyView>::iterator_concept, 36 typename OuterIter<InputView, ForwardTinyView>::iterator_concept>); 37 38 // iterator_category 39 40 static_assert(std::same_as<typename InnerIter<ForwardView, ForwardView>::iterator_category, std::forward_iterator_tag>); 41 42 template <class Range, class Pattern> 43 concept NoIteratorCategory = !requires { typename InnerIter<Range, Pattern>::iterator_category; }; 44 static_assert(NoIteratorCategory<InputView, ForwardTinyView>); 45 46 // value_type 47 48 static_assert(std::same_as<typename InnerIter<ForwardView, ForwardView>::value_type, 49 std::ranges::range_value_t<ForwardView>>); 50 51 // difference_type 52 53 static_assert(std::same_as<typename InnerIter<ForwardView, ForwardView>::difference_type, 54 std::ranges::range_difference_t<ForwardView>>); 55