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 decltype(auto) operator*() const;
12
13#include <cassert>
14#include <ranges>
15
16#include "test_macros.h"
17#include "../types.h"
18
19constexpr bool test() {
20 int buffer[4][4] = {{1, 2, 3, 4}, {5, 6, 7, 8}, {9, 10, 11, 12}, {13, 14, 15, 16}};
21
22 {
23 std::ranges::join_view jv(buffer);
24 auto iter = jv.begin();
25 for (int i = 1; i < 17; ++i) {
26 assert(*iter++ == i);
27 }
28 }
29 {
30 std::ranges::join_view jv(buffer);
31 auto iter = std::next(jv.begin(), 15);
32 assert(*iter++ == 16);
33 assert(iter == jv.end());
34 }
35 {
36 ChildView children[4] = {ChildView(buffer[0]), ChildView(buffer[1]), ChildView(buffer[2]), ChildView(buffer[3])};
37 auto jv = std::ranges::join_view(ParentView(children));
38 auto iter = jv.begin();
39 for (int i = 1; i < 17; ++i) {
40 assert(*iter == i);
41 ++iter;
42 }
43 }
44
45 return true;
46}
47
48int main(int, char**) {
49 test();
50 static_assert(test());
51
52 return 0;
53}
54

source code of libcxx/test/std/ranges/range.adaptors/range.join/range.join.iterator/star.pass.cpp