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 // UNSUPPORTED: libcpp-has-no-incomplete-ranges
11
12 // template <class I1, class I2>
13 // struct in_in_result;
14
15 #include <algorithm>
16 #include <cassert>
17 #include <type_traits>
18
19 #include "MoveOnly.h"
20
21 struct A {
22 explicit A(int);
23 };
24 // no implicit conversion
25 static_assert(!std::is_constructible_v<std::ranges::in_in_result<A, A>, std::ranges::in_in_result<int, int>>);
26
27 struct B {
28 B(int);
29 };
30 // implicit conversion
31 static_assert(std::is_constructible_v<std::ranges::in_in_result<B, B>, std::ranges::in_in_result<int, int>>);
32 static_assert(std::is_constructible_v<std::ranges::in_in_result<B, B>, std::ranges::in_in_result<int, int>&>);
33 static_assert(std::is_constructible_v<std::ranges::in_in_result<B, B>, const std::ranges::in_in_result<int, int>>);
34 static_assert(std::is_constructible_v<std::ranges::in_in_result<B, B>, const std::ranges::in_in_result<int, int>&>);
35
36 struct C {
37 C(int&);
38 };
39 static_assert(!std::is_constructible_v<std::ranges::in_in_result<C, C>, std::ranges::in_in_result<int, int>&>);
40
41 // has to be convertible via const&
42 static_assert(std::is_convertible_v<std::ranges::in_in_result<int, int>&, std::ranges::in_in_result<long, long>>);
43 static_assert(std::is_convertible_v<const std::ranges::in_in_result<int, int>&, std::ranges::in_in_result<long, long>>);
44 static_assert(std::is_convertible_v<std::ranges::in_in_result<int, int>&&, std::ranges::in_in_result<long, long>>);
45 static_assert(std::is_convertible_v<const std::ranges::in_in_result<int, int>&&, std::ranges::in_in_result<long, long>>);
46
47 // should be move constructible
48 static_assert(std::is_move_constructible_v<std::ranges::in_in_result<MoveOnly, int>>);
49 static_assert(std::is_move_constructible_v<std::ranges::in_in_result<int, MoveOnly>>);
50
51 struct NotConvertible {};
52 // conversions should not work if there is no conversion
53 static_assert(!std::is_convertible_v<std::ranges::in_in_result<NotConvertible, int>, std::ranges::in_in_result<int, int>>);
54 static_assert(!std::is_convertible_v<std::ranges::in_in_result<int, NotConvertible>, std::ranges::in_in_result<int, int>>);
55
56 template <class T>
57 struct ConstructibleFrom {
ConstructibleFromConstructibleFrom58 constexpr ConstructibleFrom(T c) : content{c} {}
59 T content;
60 };
61
test()62 constexpr bool test() {
63 {
64 std::ranges::in_in_result<int, double> res{10L, 0.};
65 assert(res.in1 == 10);
66 assert(res.in2 == 0.);
67 std::ranges::in_in_result<ConstructibleFrom<int>, ConstructibleFrom<double>> res2 = res;
68 assert(res2.in1.content == 10);
69 assert(res2.in2.content == 0.);
70 }
71 {
72 std::ranges::in_in_result<MoveOnly, int> res{MoveOnly{}, 0};
73 assert(res.in1.get() == 1);
74 [[maybe_unused]] auto res2 = static_cast<std::ranges::in_in_result<MoveOnly, int>>(std::move(res));
75 assert(res.in1.get() == 0);
76 }
77 {
78 auto [in1, in2] = std::ranges::in_in_result<int, int>{1, 2};
79 assert(in1 == 1);
80 assert(in2 == 2);
81 }
82
83 return true;
84 }
85
main(int,char **)86 int main(int, char**) {
87 test();
88 static_assert(test());
89
90 return 0;
91 }
92