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 iota_view(iterator first, see below last); // explicit since C++23
12
13 #include <ranges>
14 #include <cassert>
15
16 #include "test_convertible.h"
17 #include "test_macros.h"
18 #include "types.h"
19
20 // SFINAE tests.
21
22 #if TEST_STD_VER >= 23
23
24 std::ranges::iota_view<SomeInt, SomeInt> view;
25
26 static_assert(!test_convertible<std::ranges::iota_view<SomeInt, SomeInt>,
27 decltype(std::ranges::iota_view<SomeInt, SomeInt>{}.begin()),
28 decltype(std::ranges::iota_view<SomeInt, SomeInt>{}.end())>(),
29 "This constructor must be explicit");
30
31 static_assert(!test_convertible<std::ranges::iota_view<SomeInt>,
32 decltype(std::ranges::iota_view{SomeInt{0}}.begin()),
33 decltype(std::unreachable_sentinel)>(),
34 "This constructor must be explicit");
35
36 static_assert(!test_convertible<std::ranges::iota_view<SomeInt, IntComparableWith<SomeInt>>,
37 decltype(std::ranges::iota_view{SomeInt(0), IntComparableWith(SomeInt(10))}.begin()),
38 decltype(std::ranges::iota_view{SomeInt(0), IntComparableWith(SomeInt(10))}.end())>(),
39 "This constructor must be explicit");
40
41 #else
42
43 static_assert(test_convertible<std::ranges::iota_view<SomeInt, SomeInt>,
44 decltype(std::ranges::iota_view<SomeInt, SomeInt>{}.begin()),
45 decltype(std::ranges::iota_view<SomeInt, SomeInt>{}.end())>(),
46 "This constructor must not be explicit");
47
48 static_assert(test_convertible<std::ranges::iota_view<SomeInt>,
49 decltype(std::ranges::iota_view{SomeInt{0}}.begin()),
50 decltype(std::unreachable_sentinel)>(),
51 "This constructor must not be explicit");
52
53 static_assert(test_convertible<std::ranges::iota_view<SomeInt, IntComparableWith<SomeInt>>,
54 decltype(std::ranges::iota_view{SomeInt(0), IntComparableWith(SomeInt(10))}.begin()),
55 decltype(std::ranges::iota_view{SomeInt(0), IntComparableWith(SomeInt(10))}.end())>(),
56 "This constructor must not be explicit");
57
58 #endif // TEST_STD_VER >= 23
59
test()60 constexpr bool test() {
61 {
62 std::ranges::iota_view commonView(SomeInt(0), SomeInt(10));
63 std::ranges::iota_view<SomeInt, SomeInt> io(commonView.begin(), commonView.end());
64 assert(std::ranges::next(io.begin(), 10) == io.end());
65 }
66
67 {
68 std::ranges::iota_view unreachableSent(SomeInt(0));
69 std::ranges::iota_view<SomeInt> io(unreachableSent.begin(), std::unreachable_sentinel);
70 assert(std::ranges::next(io.begin(), 10) != io.end());
71 }
72
73 {
74 std::ranges::iota_view differentTypes(SomeInt(0), IntComparableWith(SomeInt(10)));
75 std::ranges::iota_view<SomeInt, IntComparableWith<SomeInt>> io(differentTypes.begin(), differentTypes.end());
76 assert(std::ranges::next(io.begin(), 10) == io.end());
77 }
78
79 {
80 std::ranges::iota_view<int, std::unreachable_sentinel_t> iv1;
81 // There should be only one overload available and {} resolves to unreachable_sentinel_t
82 [[maybe_unused]] std::ranges::iota_view<int, std::unreachable_sentinel_t> iv2(iv1.begin(), {});
83 }
84
85 return true;
86 }
87
main(int,char **)88 int main(int, char**) {
89 test();
90 static_assert(test());
91
92 return 0;
93 }
94
95