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 // friend constexpr bool operator==(const inner-iterator& x, const inner-iterator& y);
12 // requires forward_range<Base>;
13 //
14 // friend constexpr bool operator==(const inner-iterator& x, default_sentinel_t);
15
16 #include <ranges>
17
18 #include <concepts>
19 #include <string_view>
20
21 #include "../types.h"
22
23 #include "test_range.h"
24
test()25 constexpr bool test() {
26 // When `View` is a forward range, `inner-iterator` supports both overloads of `operator==`.
27 {
28 SplitViewForward v("abc def", " ");
29 auto val = *v.begin();
30 auto b = val.begin();
31 std::same_as<std::default_sentinel_t> decltype(auto) e = val.end();
32
33 // inner-iterator == inner-iterator
34 {
35 assert(b == b);
36 assert(!(b != b));
37 }
38
39 // inner-iterator == default_sentinel
40 {
41 assert(!(b == e));
42 assert(b != e);
43
44 assert(!(b == std::default_sentinel));
45 assert(b != std::default_sentinel);
46 }
47 }
48
49 // When `View` is an input range, `inner-iterator only supports comparing an `inner-iterator` to the default sentinel.
50 {
51 SplitViewInput v("abc def", ' ');
52 auto val = *v.begin();
53 auto b = val.begin();
54 std::same_as<std::default_sentinel_t> decltype(auto) e = val.end();
55
56 static_assert(!weakly_equality_comparable_with<decltype(b), decltype(b)>);
57
58 assert(!(b == std::default_sentinel));
59 assert(b != std::default_sentinel);
60 assert(!(b == e));
61 assert(b != e);
62 }
63
64 return true;
65 }
66
main(int,char **)67 int main(int, char**) {
68 test();
69 static_assert(test());
70
71 return 0;
72 }
73