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<viewable_range R>
14 // using all_t = decltype(views::all(declval<R>()));
15 
16 #include <ranges>
17 
18 #include "test_iterators.h"
19 
20 struct View : std::ranges::view_base {
21   int *begin() const;
22   int *end() const;
23 };
24 
25 struct Range {
26   int *begin() const;
27   int *end() const;
28 };
29 
30 struct BorrowableRange {
31   int *begin() const;
32   int *end() const;
33 };
34 template<>
35 inline constexpr bool std::ranges::enable_borrowed_range<BorrowableRange> = true;
36 
37 template <class T>
38 concept HasAllT = requires {
39     typename std::views::all_t<T>;
40 };
41 
42 // When T is a view, returns decay-copy(T)
43 ASSERT_SAME_TYPE(std::views::all_t<View>, View);
44 ASSERT_SAME_TYPE(std::views::all_t<View&>, View);
45 ASSERT_SAME_TYPE(std::views::all_t<View&&>, View);
46 ASSERT_SAME_TYPE(std::views::all_t<const View>, View);
47 ASSERT_SAME_TYPE(std::views::all_t<const View&>, View);
48 ASSERT_SAME_TYPE(std::views::all_t<const View&&>, View);
49 
50 // Otherwise, when T is a reference to a range, returns ref_view<T>
51 ASSERT_SAME_TYPE(std::views::all_t<Range&>, std::ranges::ref_view<Range>);
52 ASSERT_SAME_TYPE(std::views::all_t<const Range&>, std::ranges::ref_view<const Range>);
53 ASSERT_SAME_TYPE(std::views::all_t<BorrowableRange&>, std::ranges::ref_view<BorrowableRange>);
54 ASSERT_SAME_TYPE(std::views::all_t<const BorrowableRange&>, std::ranges::ref_view<const BorrowableRange>);
55 
56 // Otherwise, returns owning_view<T>
57 ASSERT_SAME_TYPE(std::views::all_t<Range>, std::ranges::owning_view<Range>);
58 ASSERT_SAME_TYPE(std::views::all_t<Range&&>, std::ranges::owning_view<Range>);
59 static_assert(!HasAllT<const Range>);
60 static_assert(!HasAllT<const Range&&>);
61 ASSERT_SAME_TYPE(std::views::all_t<BorrowableRange>, std::ranges::owning_view<BorrowableRange>);
62 ASSERT_SAME_TYPE(std::views::all_t<BorrowableRange&&>, std::ranges::owning_view<BorrowableRange>);
63 static_assert(!HasAllT<const BorrowableRange>);
64 static_assert(!HasAllT<const BorrowableRange&&>);
65