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-has-no-incomplete-ranges
11 
12 // template<viewable_range R>
13 // using all_t = decltype(views::all(declval<R>()));
14 
15 #include <ranges>
16 
17 #include "test_iterators.h"
18 
19 struct View : std::ranges::view_base {
20   int *begin() const;
21   int *end() const;
22 };
23 
24 struct Range {
25   int *begin() const;
26   int *end() const;
27 };
28 
29 struct BorrowableRange {
30   int *begin() const;
31   int *end() const;
32 };
33 template<>
34 inline constexpr bool std::ranges::enable_borrowed_range<BorrowableRange> = true;
35 
36 template <class T>
37 concept HasAllT = requires {
38     typename std::views::all_t<T>;
39 };
40 
41 // When T is a view, returns decay-copy(T)
42 ASSERT_SAME_TYPE(std::views::all_t<View>, View);
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<const 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 
49 // Otherwise, when T is a reference to a range, returns ref_view<T>
50 ASSERT_SAME_TYPE(std::views::all_t<Range&>, std::ranges::ref_view<Range>);
51 ASSERT_SAME_TYPE(std::views::all_t<const Range&>, std::ranges::ref_view<const Range>);
52 ASSERT_SAME_TYPE(std::views::all_t<BorrowableRange&>, std::ranges::ref_view<BorrowableRange>);
53 ASSERT_SAME_TYPE(std::views::all_t<const BorrowableRange&>, std::ranges::ref_view<const BorrowableRange>);
54 
55 // Otherwise, returns owning_view<T>
56 ASSERT_SAME_TYPE(std::views::all_t<Range>, std::ranges::owning_view<Range>);
57 ASSERT_SAME_TYPE(std::views::all_t<Range&&>, std::ranges::owning_view<Range>);
58 static_assert(!HasAllT<const Range>);
59 static_assert(!HasAllT<const Range&&>);
60 ASSERT_SAME_TYPE(std::views::all_t<BorrowableRange>, std::ranges::owning_view<BorrowableRange>);
61 ASSERT_SAME_TYPE(std::views::all_t<BorrowableRange&&>, std::ranges::owning_view<BorrowableRange>);
62 static_assert(!HasAllT<const BorrowableRange>);
63 static_assert(!HasAllT<const BorrowableRange&&>);
64