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#include "test_macros.h"
12
13TEST_CLANG_DIAGNOSTIC_IGNORED("-Wsign-compare")
14TEST_GCC_DIAGNOSTIC_IGNORED("-Wsign-compare")
15TEST_MSVC_DIAGNOSTIC_IGNORED(4018 4389) // various "signed/unsigned mismatch"
16
17// constexpr iota_view(type_identity_t<W> value, type_identity_t<Bound> bound); // explicit since C++23
18
19#include <ranges>
20#include <cassert>
21
22#include "test_convertible.h"
23#include "types.h"
24
25// SFINAE tests.
26
27#if TEST_STD_VER >= 23
28
29static_assert(!test_convertible<std::ranges::iota_view<SomeInt, SomeInt>,
30 decltype(std::ranges::iota_view<SomeInt, SomeInt>{}.begin()),
31 decltype(std::ranges::iota_view<SomeInt, SomeInt>{}.end())>(),
32 "This constructor must be explicit");
33
34static_assert(!test_convertible<std::ranges::iota_view<SomeInt>,
35 decltype(std::ranges::iota_view<SomeInt>{}.begin()),
36 decltype(std::unreachable_sentinel)>(),
37 "This constructor must be explicit");
38
39static_assert(!test_convertible<std::ranges::iota_view<SomeInt, IntComparableWith<SomeInt>>,
40 decltype(std::ranges::iota_view{SomeInt(0), IntComparableWith(SomeInt(10))}.begin()),
41 decltype(std::ranges::iota_view{SomeInt(0), IntComparableWith(SomeInt(10))}.end())>(),
42 "This constructor must be explicit");
43
44#else
45
46static_assert( test_convertible<std::ranges::iota_view<SomeInt, SomeInt>,
47 decltype(std::ranges::iota_view<SomeInt, SomeInt>{}.begin()),
48 decltype(std::ranges::iota_view<SomeInt, SomeInt>{}.end())>(),
49 "This constructor must not be explicit");
50
51static_assert( test_convertible<std::ranges::iota_view<SomeInt>,
52 decltype(std::ranges::iota_view<SomeInt>{}.begin()),
53 decltype(std::unreachable_sentinel)>(),
54 "This constructor must not be explicit");
55
56static_assert( test_convertible<std::ranges::iota_view<SomeInt, IntComparableWith<SomeInt>>,
57 decltype(std::ranges::iota_view{SomeInt(0), IntComparableWith(SomeInt(10))}.begin()),
58 decltype(std::ranges::iota_view{SomeInt(0), IntComparableWith(SomeInt(10))}.end())>(),
59 "This constructor must not be explicit");
60
61#endif // TEST_STD_VER >= 23
62
63constexpr bool test() {
64 {
65 std::ranges::iota_view<SomeInt, SomeInt> io(SomeInt(0), SomeInt(10));
66 assert(std::ranges::next(io.begin(), 10) == io.end());
67 }
68
69 {
70 std::ranges::iota_view<SomeInt> io(SomeInt(0), std::unreachable_sentinel);
71 assert(std::ranges::next(io.begin(), 10) != io.end());
72 }
73
74 {
75 std::ranges::iota_view<SomeInt, IntComparableWith<SomeInt>> io(SomeInt(0), IntComparableWith(SomeInt(10)));
76 assert(std::ranges::next(io.begin(), 10) == io.end());
77 }
78
79 {
80 // This is allowed only when using the constructor (not the deduction guide).
81 std::ranges::iota_view<int, unsigned> signedUnsigned(0, 10);
82 assert(std::ranges::next(signedUnsigned.begin(), 10) == signedUnsigned.end());
83 }
84
85 {
86 // This is allowed only when using the constructor (not the deduction guide).
87 std::ranges::iota_view<unsigned, int> signedUnsigned(0, 10);
88 assert(std::ranges::next(signedUnsigned.begin(), 10) == signedUnsigned.end());
89 }
90
91 return true;
92}
93
94int main(int, char**) {
95 test();
96 static_assert(test());
97
98 return 0;
99}
100

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