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
24std::ranges::iota_view<SomeInt, SomeInt> view;
25
26static_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
31static_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
36static_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
43static_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
48static_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
53static_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
60constexpr 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
88int main(int, char**) {
89 test();
90 static_assert(test());
91
92 return 0;
93}
94
95

source code of libcxx/test/std/ranges/range.factories/range.iota.view/ctor.first.last.pass.cpp