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<common_view<T>> = enable_borrowed_range<T>;
15 
16 #include <ranges>
17 #include <cassert>
18 
19 #include "test_iterators.h"
20 
21 struct View : std::ranges::view_base {
22   int *begin() const;
23   sentinel_wrapper<int*> end() const;
24 };
25 
26 struct BorrowableView : std::ranges::view_base {
27   int *begin() const;
28   sentinel_wrapper<int*> end() const;
29 };
30 template<>
31 inline constexpr bool std::ranges::enable_borrowed_range<BorrowableView> = true;
32 
33 static_assert(!std::ranges::enable_borrowed_range<std::ranges::common_view<View>>);
34 static_assert( std::ranges::enable_borrowed_range<std::ranges::common_view<BorrowableView>>);
35