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 // constexpr explicit common_view(V r);
13 
14 #include <ranges>
15 
16 #include <cassert>
17 #include <utility>
18 
19 #include "test_iterators.h"
20 #include "types.h"
21 
22 constexpr bool test() {
23   int buf[8] = {1, 2, 3, 4, 5, 6, 7, 8};
24 
25   {
26     MoveOnlyView view{buf, buf + 8};
27     std::ranges::common_view<MoveOnlyView> common(std::move(view));
28     assert(std::move(common).base().begin_ == buf);
29   }
30 
31   {
32     CopyableView const view{buf, buf + 8};
33     std::ranges::common_view<CopyableView> const common(view);
34     assert(common.base().begin_ == buf);
35   }
36 
37   return true;
38 }
39 
40 int main(int, char**) {
41   test();
42   static_assert(test());
43 
44   // Can't compare common_iterator inside constexpr
45   {
46     int buf[8] = {1, 2, 3, 4, 5, 6, 7, 8};
47     MoveOnlyView view{buf, buf + 8};
48     std::ranges::common_view<MoveOnlyView> const common(std::move(view));
49     assert(common.begin() == buf);
50   }
51 
52   return 0;
53 }
54