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 // std::ranges::lazy_split_view::outer-iterator::value_type::begin()
13 
14 #include <ranges>
15 
16 #include <cassert>
17 #include "../types.h"
18 
19 constexpr bool test() {
20   // `View` is a forward range.
21   {
22     CopyableView input("a");
23 
24     // Non-const.
25     {
26       SplitViewCopyable v(input, "b");
27       auto val = *v.begin();
28       assert(val.begin().base() == input.begin());
29     }
30 
31     // Const.
32     {
33       SplitViewCopyable v(input, "b");
34       const auto val = *v.begin();
35       assert(val.begin().base() == input.begin());
36     }
37   }
38 
39   // `View` is an input range.
40   {
41     InputView input("a");
42 
43     // Non-const.
44     {
45       SplitViewInput v(input, 'b');
46       auto val = *v.begin();
47       // Copies of `InputView` are independent and the iterators won't compare the same.
48       assert(*val.begin().base() == *input.begin());
49     }
50 
51     // Const.
52     {
53       SplitViewInput v(input, 'b');
54       const auto val = *v.begin();
55       // Copies of `InputView` are independent and the iterators won't compare the same.
56       assert(*val.begin().base() == *input.begin());
57     }
58   }
59 
60   return true;
61 }
62 
63 int main(int, char**) {
64   assert(test());
65   static_assert(test());
66 
67   return 0;
68 }
69