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
13 TEST_CLANG_DIAGNOSTIC_IGNORED("-Wsign-compare")
14 TEST_GCC_DIAGNOSTIC_IGNORED("-Wsign-compare")
15 TEST_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
29 static_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
34 static_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
39 static_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
46 static_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
51 static_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
56 static_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
test()63 constexpr 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
main(int,char **)94 int main(int, char**) {
95 test();
96 static_assert(test());
97
98 return 0;
99 }
100