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 // UNSUPPORTED: libcpp-no-concepts
11 // UNSUPPORTED: libcpp-has-no-incomplete-ranges
12 
13 // template<class T>
14 //   inline constexpr bool enable_borrowed_range<owning_view<T>> = enable_borrowed_range<T>;
15 
16 #include <ranges>
17 #include <cassert>
18 
19 struct Range {
20   int *begin() const;
21   int *end() const;
22 };
23 
24 struct BorrowableRange {
25   int *begin() const;
26   int *end() const;
27 };
28 
29 template<>
30 inline constexpr bool std::ranges::enable_borrowed_range<BorrowableRange> = true;
31 
32 static_assert(!std::ranges::enable_borrowed_range<std::ranges::owning_view<Range>>);
33 static_assert( std::ranges::enable_borrowed_range<std::ranges::owning_view<BorrowableRange>>);
34