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, c++20
10 // UNSUPPORTED: libcpp-has-no-incomplete-ranges
11 
12 // template<class... Views>
13 // inline constexpr bool enable_borrowed_range<zip_view<Views...>> =
14 //      (enable_borrowed_range<Views> && ...);
15 
16 #include <ranges>
17 #include <tuple>
18 
19 struct Borrowed : std::ranges::view_base {
20   int* begin() const;
21   int* end() const;
22 };
23 
24 template <>
25 inline constexpr bool std::ranges::enable_borrowed_range<Borrowed> = true;
26 
27 static_assert(std::ranges::borrowed_range<Borrowed>);
28 
29 struct NonBorrowed : std::ranges::view_base {
30   int* begin() const;
31   int* end() const;
32 };
33 static_assert(!std::ranges::borrowed_range<NonBorrowed>);
34 
35 // test borrowed_range
36 static_assert(std::ranges::borrowed_range<std::ranges::zip_view<Borrowed>>);
37 static_assert(std::ranges::borrowed_range<std::ranges::zip_view<Borrowed, Borrowed>>);
38 static_assert(!std::ranges::borrowed_range<std::ranges::zip_view<Borrowed, NonBorrowed>>);
39 static_assert(!std::ranges::borrowed_range<std::ranges::zip_view<NonBorrowed>>);
40 static_assert(!std::ranges::borrowed_range<std::ranges::zip_view<NonBorrowed, NonBorrowed>>);
41