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 // template<class T> 12 // inline constexpr bool enable_borrowed_range<common_view<T>> = enable_borrowed_range<T>; 13 14 #include <ranges> 15 16 // common_view can only wrap Ts that are `view<T> && !common_range<T>`, so we need to invent one. 17 struct Uncommon : std::ranges::view_base { 18 int *begin() const; 19 std::unreachable_sentinel_t end() const; 20 }; 21 22 static_assert(!std::ranges::borrowed_range<std::ranges::common_view<Uncommon>>); 23 static_assert(!std::ranges::borrowed_range<std::ranges::common_view<std::ranges::owning_view<Uncommon>>>); 24 static_assert( std::ranges::borrowed_range<std::ranges::common_view<std::ranges::ref_view<Uncommon>>>); 25