| //===----------------------------------------------------------------------===// |
| // |
| // 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 |
| |
| // constexpr auto end() requires forward_range<View> && common_range<View>; |
| // constexpr auto end() const; |
| |
| #include <ranges> |
| |
| #include <cassert> |
| #include <utility> |
| #include "test_iterators.h" |
| #include "types.h" |
| |
| struct ForwardViewCommonIfConst : std::ranges::view_base { |
| std::string_view view_; |
| constexpr explicit ForwardViewCommonIfConst() = default; |
| constexpr ForwardViewCommonIfConst(const char* ptr) : view_(ptr) {} |
| constexpr ForwardViewCommonIfConst(std::string_view v) : view_(v) {} |
| constexpr ForwardViewCommonIfConst(ForwardViewCommonIfConst&&) = default; |
| constexpr ForwardViewCommonIfConst& operator=(ForwardViewCommonIfConst&&) = default; |
| constexpr ForwardViewCommonIfConst(const ForwardViewCommonIfConst&) = default; |
| constexpr ForwardViewCommonIfConst& operator=(const ForwardViewCommonIfConst&) = default; |
| constexpr forward_iterator<char*> begin() { return forward_iterator<char*>(nullptr); } |
| constexpr std::default_sentinel_t end() { return std::default_sentinel; } |
| constexpr forward_iterator<std::string_view::const_iterator> begin() const { return forward_iterator<std::string_view::const_iterator>(view_.begin()); } |
| constexpr forward_iterator<std::string_view::const_iterator> end() const { return forward_iterator<std::string_view::const_iterator>(view_.end()); } |
| }; |
| bool operator==(forward_iterator<char*>, std::default_sentinel_t) { return false; } |
| |
| struct ForwardViewNonCommonRange : std::ranges::view_base { |
| std::string_view view_; |
| constexpr explicit ForwardViewNonCommonRange() = default; |
| constexpr ForwardViewNonCommonRange(const char* ptr) : view_(ptr) {} |
| constexpr ForwardViewNonCommonRange(std::string_view v) : view_(v) {} |
| constexpr ForwardViewNonCommonRange(ForwardViewNonCommonRange&&) = default; |
| constexpr ForwardViewNonCommonRange& operator=(ForwardViewNonCommonRange&&) = default; |
| constexpr ForwardViewNonCommonRange(const ForwardViewNonCommonRange&) = default; |
| constexpr ForwardViewNonCommonRange& operator=(const ForwardViewNonCommonRange&) = default; |
| constexpr forward_iterator<char*> begin() { return forward_iterator<char*>(nullptr); } |
| constexpr std::default_sentinel_t end() { return std::default_sentinel; } |
| constexpr forward_iterator<std::string_view::const_iterator> begin() const { return forward_iterator<std::string_view::const_iterator>(view_.begin()); } |
| constexpr std::default_sentinel_t end() const { return std::default_sentinel; } |
| }; |
| bool operator==(forward_iterator<std::string_view::const_iterator>, std::default_sentinel_t) { return false; } |
| |
| constexpr bool test() { |
| // non-const: forward_range<V> && simple_view<V> && simple_view<P> -> outer-iterator<Const = true> |
| // const: forward_range<V> && common_range<V> -> outer-iterator<Const = true> |
| { |
| using V = ForwardView; |
| using P = V; |
| |
| static_assert(std::ranges::forward_range<V>); |
| static_assert(std::ranges::common_range<const V>); |
| LIBCPP_STATIC_ASSERT(std::ranges::__simple_view<V>); |
| LIBCPP_STATIC_ASSERT(std::ranges::__simple_view<P>); |
| |
| { |
| std::ranges::lazy_split_view<V, P> v; |
| auto it = v.end(); |
| static_assert(std::is_same_v<decltype(it)::iterator_concept, std::forward_iterator_tag>); |
| static_assert(std::is_same_v<decltype(*(*it).begin()), const char&>); |
| } |
| |
| { |
| const std::ranges::lazy_split_view<V, P> cv; |
| auto it = cv.end(); |
| static_assert(std::is_same_v<decltype(it)::iterator_concept, std::forward_iterator_tag>); |
| static_assert(std::is_same_v<decltype(*(*it).begin()), const char&>); |
| } |
| } |
| |
| // non-const: forward_range<V> && common_range<V> && simple_view<V> && !simple_view<P> -> outer-iterator<Const=false> |
| // const: forward_range<V> && forward_range<const V> && common_range<const V> -> outer-iterator<Const = false> |
| { |
| using V = ForwardView; |
| using P = ForwardDiffView; |
| |
| static_assert(std::ranges::forward_range<V>); |
| static_assert(std::ranges::common_range<V>); |
| LIBCPP_STATIC_ASSERT(std::ranges::__simple_view<V>); |
| LIBCPP_STATIC_ASSERT(!std::ranges::__simple_view<P>); |
| static_assert(std::ranges::forward_range<const V>); |
| static_assert(std::ranges::common_range<const V>); |
| |
| { |
| std::ranges::lazy_split_view<V, P> v; |
| auto it = v.end(); |
| static_assert(std::is_same_v<decltype(it)::iterator_concept, std::forward_iterator_tag>); |
| static_assert(std::is_same_v<decltype(*(*it).begin()), const char&>); |
| } |
| |
| { |
| const std::ranges::lazy_split_view<V, P> cv; |
| auto it = cv.end(); |
| static_assert(std::is_same_v<decltype(it)::iterator_concept, std::forward_iterator_tag>); |
| static_assert(std::is_same_v<decltype(*(*it).begin()), const char&>); |
| } |
| } |
| |
| // non-const: forward_range<V> && !common_range<V> -> disabled |
| // const: forward_range<V> && forward_range<const V> && common_range<const V> -> outer-iterator<Const = true> |
| { |
| using V = ForwardViewCommonIfConst; |
| using P = V; |
| |
| static_assert(std::ranges::forward_range<V>); |
| static_assert(!std::ranges::common_range<V>); |
| static_assert(std::ranges::forward_range<const V>); |
| static_assert(std::ranges::common_range<const V>); |
| |
| { |
| std::ranges::lazy_split_view<V, P> v; |
| auto it = v.begin(); |
| static_assert(std::is_same_v<decltype(it)::iterator_concept, std::forward_iterator_tag>); |
| static_assert(std::is_same_v<decltype(*(*it).begin()), char&>); |
| } |
| |
| { |
| const std::ranges::lazy_split_view<V, P> cv; |
| auto it = cv.begin(); |
| static_assert(std::is_same_v<decltype(it)::iterator_concept, std::forward_iterator_tag>); |
| static_assert(std::is_same_v<decltype(*(*it).begin()), const char&>); |
| } |
| } |
| |
| // non-const: forward_range<V> && !common_range<V> -> disabled |
| // const: forward_range<V> && forward_range<const V> && !common_range<const V> -> outer-iterator<Const = false> |
| { |
| using V = ForwardViewNonCommonRange; |
| using P = V; |
| |
| static_assert(std::ranges::forward_range<V>); |
| static_assert(!std::ranges::common_range<V>); |
| static_assert(std::ranges::forward_range<const V>); |
| static_assert(!std::ranges::common_range<const V>); |
| |
| { |
| std::ranges::lazy_split_view<V, P> v; |
| auto it = v.end(); |
| static_assert(std::same_as<decltype(it), std::default_sentinel_t>); |
| } |
| |
| { |
| const std::ranges::lazy_split_view<V, P> cv; |
| auto it = cv.end(); |
| static_assert(std::same_as<decltype(it), std::default_sentinel_t>); |
| } |
| } |
| |
| return true; |
| } |
| |
| int main(int, char**) { |
| test(); |
| static_assert(test()); |
| |
| return 0; |
| } |