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-no-concepts
11 // UNSUPPORTED: libcpp-has-no-incomplete-ranges
12 
13 // constexpr explicit join_view(V base);
14 
15 #include <cassert>
16 #include <ranges>
17 
18 #include "test_macros.h"
19 #include "types.h"
20 
21 constexpr bool test() {
22   int buffer[4][4] = {{1111, 2222, 3333, 4444}, {555, 666, 777, 888}, {99, 1010, 1111, 1212}, {13, 14, 15, 16}};
23 
24   {
25     ChildView children[4] = {ChildView(buffer[0]), ChildView(buffer[1]), ChildView(buffer[2]), ChildView(buffer[3])};
26     auto jv = std::ranges::join_view(ParentView{children});
27     assert(std::move(jv).base().ptr_ == children);
28   }
29 
30   {
31     std::ranges::join_view jv(buffer);
32     assert(jv.base().base() == buffer + 0);
33   }
34 
35   {
36     // Test explicitness.
37     static_assert( std::is_constructible_v<std::ranges::join_view<ParentView<ChildView>>, ParentView<ChildView>>);
38     static_assert(!std::is_convertible_v<std::ranges::join_view<ParentView<ChildView>>, ParentView<ChildView>>);
39   }
40 
41   return true;
42 }
43 
44 int main(int, char**) {
45   test();
46   static_assert(test());
47 
48   return 0;
49 }
50