| //===----------------------------------------------------------------------===// |
| // |
| // 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, c++20 |
| |
| // constexpr sentinel(sentinel<!Const> s); |
| |
| #include <cassert> |
| #include <ranges> |
| |
| #include "../types.h" |
| |
| template <class T> |
| struct convertible_sentinel_wrapper { |
| explicit convertible_sentinel_wrapper() = default; |
| constexpr convertible_sentinel_wrapper(const T& it) : it_(it) {} |
| |
| template <class U> |
| requires std::convertible_to<const U&, T> |
| constexpr convertible_sentinel_wrapper(const convertible_sentinel_wrapper<U>& other) : it_(other.it_) {} |
| |
| constexpr friend bool operator==(convertible_sentinel_wrapper const& self, const T& other) { |
| return self.it_ == other; |
| } |
| T it_; |
| }; |
| |
| struct NonSimpleNonCommonConvertibleView : IntBufferView { |
| using IntBufferView::IntBufferView; |
| |
| constexpr int* begin() { return buffer_; } |
| constexpr const int* begin() const { return buffer_; } |
| constexpr convertible_sentinel_wrapper<int*> end() { return convertible_sentinel_wrapper<int*>(buffer_ + size_); } |
| constexpr convertible_sentinel_wrapper<const int*> end() const { |
| return convertible_sentinel_wrapper<const int*>(buffer_ + size_); |
| } |
| }; |
| |
| static_assert(!std::ranges::common_range<NonSimpleNonCommonConvertibleView>); |
| static_assert(std::ranges::random_access_range<NonSimpleNonCommonConvertibleView>); |
| static_assert(!std::ranges::sized_range<NonSimpleNonCommonConvertibleView>); |
| static_assert(std::convertible_to<std::ranges::sentinel_t<NonSimpleNonCommonConvertibleView>, |
| std::ranges::sentinel_t<NonSimpleNonCommonConvertibleView const>>); |
| LIBCPP_STATIC_ASSERT(!std::ranges::__simple_view<NonSimpleNonCommonConvertibleView>); |
| |
| constexpr bool test() { |
| int buffer1[4] = {1, 2, 3, 4}; |
| int buffer2[5] = {1, 2, 3, 4, 5}; |
| std::ranges::zip_view v{NonSimpleNonCommonConvertibleView(buffer1), NonSimpleNonCommonConvertibleView(buffer2)}; |
| static_assert(!std::ranges::common_range<decltype(v)>); |
| auto sent1 = v.end(); |
| std::ranges::sentinel_t<const decltype(v)> sent2 = sent1; |
| static_assert(!std::is_same_v<decltype(sent1), decltype(sent2)>); |
| |
| assert(v.begin() != sent2); |
| assert(std::as_const(v).begin() != sent2); |
| assert(v.begin() + 4 == sent2); |
| assert(std::as_const(v).begin() + 4 == sent2); |
| |
| // Cannot create a non-const iterator from a const iterator. |
| static_assert(!std::constructible_from<decltype(sent1), decltype(sent2)>); |
| return true; |
| } |
| |
| int main(int, char**) { |
| test(); |
| static_assert(test()); |
| |
| return 0; |
| } |