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
11 // std::ranges::as_rvalue_view::as_rvalue_view(...)
12
13 #include <cassert>
14 #include <ranges>
15 #include <type_traits>
16 #include <utility>
17 #include <vector>
18
19 struct DefaultConstructibleView : std::ranges::view_base {
20 int* begin() const;
21 int* end() const;
22
23 int i_ = 23;
24 };
25
26 struct NonDefaultConstructibleView : std::ranges::view_base {
NonDefaultConstructibleViewNonDefaultConstructibleView27 NonDefaultConstructibleView(int i) : i_(i) {}
28
29 int* begin() const;
30 int* end() const;
31
32 int i_ = 23;
33 };
34
35 static_assert(!std::is_constructible_v<std::ranges::as_rvalue_view<NonDefaultConstructibleView>>);
36 static_assert(std::is_constructible_v<std::ranges::as_rvalue_view<NonDefaultConstructibleView>, int>);
37 static_assert(std::is_nothrow_constructible_v<std::ranges::as_rvalue_view<DefaultConstructibleView>>);
38
39 template <class T, class... Args>
40 concept IsImplicitlyConstructible = requires(T val, Args... args) { val = {std::forward<Args>(args)...}; };
41
42 static_assert(IsImplicitlyConstructible<std::ranges::as_rvalue_view<DefaultConstructibleView>>);
43 static_assert(!IsImplicitlyConstructible<std::ranges::as_rvalue_view<NonDefaultConstructibleView>, int>);
44
test()45 constexpr bool test() {
46 std::ranges::as_rvalue_view<DefaultConstructibleView> view = {};
47 assert(view.base().i_ == 23);
48
49 return true;
50 }
51
main(int,char **)52 int main(int, char**) {
53 static_assert(test());
54 test();
55
56 return 0;
57 }
58