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 sentinel(sentinel<!Const> s);
13 
14 #include <cassert>
15 #include <ranges>
16 
17 #include "test_macros.h"
18 #include "../types.h"
19 
20 constexpr bool test() {
21   int buffer[4][4] = {{1, 2, 3, 4}, {5, 6, 7, 8}, {9, 10, 11, 12}, {13, 14, 15, 16}};
22 
23   CopyableChild children[4] = {CopyableChild(buffer[0]), CopyableChild(buffer[1]), CopyableChild(buffer[2]), CopyableChild(buffer[3])};
24   std::ranges::join_view jv(CopyableParent{children});
25   auto sent1 = jv.end();
26   std::ranges::sentinel_t<const decltype(jv)> sent2 = sent1;
27   (void) sent2; // We can't really do anything with these sentinels now :/
28 
29   // We cannot create a non-const iterator from a const iterator.
30   static_assert(!std::constructible_from<decltype(sent1), decltype(sent2)>);
31 
32   return true;
33 }
34 
35 int main(int, char**) {
36   test();
37   static_assert(test());
38 
39   return 0;
40 }
41