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 | |
11 | // constexpr V base() const & requires copy_constructible<V> { return base_; } |
12 | // constexpr V base() && { return std::move(base_); } |
13 | |
14 | #include <cassert> |
15 | #include <ranges> |
16 | #include <type_traits> |
17 | #include <utility> |
18 | |
19 | #include "MoveOnly.h" |
20 | #include "types.h" |
21 | |
22 | struct View : std::ranges::view_interface<View> { |
23 | int i; |
24 | int* begin() const; |
25 | int* end() const; |
26 | }; |
27 | |
28 | struct MoveOnlyView : View { |
29 | MoveOnly mo; |
30 | }; |
31 | |
32 | template <class T> |
33 | concept HasBase = requires(T&& t) { std::forward<T>(t).base(); }; |
34 | |
35 | struct Pred { |
36 | constexpr bool operator()(int i) const { return i > 5; } |
37 | }; |
38 | |
39 | static_assert(HasBase<std::ranges::take_while_view<View, Pred> const&>); |
40 | static_assert(HasBase<std::ranges::take_while_view<View, Pred>&&>); |
41 | |
42 | static_assert(!HasBase<std::ranges::take_while_view<MoveOnlyView, Pred> const&>); |
43 | static_assert(HasBase<std::ranges::take_while_view<MoveOnlyView, Pred>&&>); |
44 | |
45 | constexpr bool test() { |
46 | // const & |
47 | { |
48 | const std::ranges::take_while_view<View, Pred> twv{View{{}, 5}, {}}; |
49 | std::same_as<View> decltype(auto) v = twv.base(); |
50 | assert(v.i == 5); |
51 | } |
52 | |
53 | // & |
54 | { |
55 | std::ranges::take_while_view<View, Pred> twv{View{{}, 5}, {}}; |
56 | std::same_as<View> decltype(auto) v = twv.base(); |
57 | assert(v.i == 5); |
58 | } |
59 | |
60 | // && |
61 | { |
62 | std::ranges::take_while_view<View, Pred> twv{View{{}, 5}, {}}; |
63 | std::same_as<View> decltype(auto) v = std::move(twv).base(); |
64 | assert(v.i == 5); |
65 | } |
66 | |
67 | // const && |
68 | { |
69 | const std::ranges::take_while_view<View, Pred> twv{View{{}, 5}, {}}; |
70 | std::same_as<View> decltype(auto) v = std::move(twv).base(); |
71 | assert(v.i == 5); |
72 | } |
73 | |
74 | // move only |
75 | { |
76 | std::ranges::take_while_view<MoveOnlyView, Pred> twv{MoveOnlyView{{}, 5}, {}}; |
77 | std::same_as<MoveOnlyView> decltype(auto) v = std::move(twv).base(); |
78 | assert(v.mo.get() == 5); |
79 | } |
80 | return true; |
81 | } |
82 | |
83 | int main(int, char**) { |
84 | test(); |
85 | static_assert(test()); |
86 | return 0; |
87 | } |
88 | |