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 // template <class I1, class I2>
12 // struct in_in_result;
13 
14 #include <algorithm>
15 #include <cassert>
16 #include <type_traits>
17 
18 #include "MoveOnly.h"
19 
20 template <class T>
21 struct ConstructibleFrom {
22   constexpr ConstructibleFrom(T c) : content{c} {}
23   T content;
24 };
25 
26 struct A {
27   explicit A(int);
28 };
29 static_assert(!std::is_constructible_v<std::ranges::in_in_result<A, A>,
30                                        std::ranges::in_in_result<int, int>>);
31 
32 struct B {
33   B(const int&);
34   B(int&&);
35 };
36 static_assert(std::is_constructible_v<std::ranges::in_in_result<B, B>, std::ranges::in_in_result<int, int>>);
37 static_assert(std::is_constructible_v<std::ranges::in_in_result<B, B>, std::ranges::in_in_result<int, int>&>);
38 static_assert(std::is_constructible_v<std::ranges::in_in_result<B, B>, const std::ranges::in_in_result<int, int>>);
39 static_assert(std::is_constructible_v<std::ranges::in_in_result<B, B>, const std::ranges::in_in_result<int, int>&>);
40 
41 struct C {
42   C(int&);
43 };
44 static_assert(!std::is_constructible_v<std::ranges::in_in_result<C, C>, std::ranges::in_in_result<int, int>&>);
45 
46 static_assert(std::is_convertible_v<         std::ranges::in_in_result<int, int>&, std::ranges::in_in_result<long, long>>);
47 static_assert(!std::is_nothrow_convertible_v<std::ranges::in_in_result<int, int>&, std::ranges::in_in_result<long, long>>);
48 static_assert(std::is_convertible_v<         const std::ranges::in_in_result<int, int>&, std::ranges::in_in_result<long, long>>);
49 static_assert(!std::is_nothrow_convertible_v<const std::ranges::in_in_result<int, int>&, std::ranges::in_in_result<long, long>>);
50 static_assert(std::is_convertible_v<         std::ranges::in_in_result<int, int>&&, std::ranges::in_in_result<long, long>>);
51 static_assert(!std::is_nothrow_convertible_v<std::ranges::in_in_result<int, int>&&, std::ranges::in_in_result<long, long>>);
52 static_assert(std::is_convertible_v<         const std::ranges::in_in_result<int, int>&&, std::ranges::in_in_result<long, long>>);
53 static_assert(!std::is_nothrow_convertible_v<const std::ranges::in_in_result<int, int>&&, std::ranges::in_in_result<long, long>>);
54 
55 struct NotConvertible {};
56 static_assert(!std::is_convertible_v<std::ranges::in_in_result<NotConvertible, int>,
57                                      std::ranges::in_in_result<int, int>>);
58 static_assert(!std::is_convertible_v<std::ranges::in_in_result<int, NotConvertible>,
59                                      std::ranges::in_in_result<int, int>>);
60 
61 constexpr bool test() {
62   {
63     std::ranges::in_in_result<int, double> res{10L, 0.};
64     assert(res.in1 == 10);
65     assert(res.in2 == 0.);
66     std::ranges::in_in_result<ConstructibleFrom<int>, ConstructibleFrom<double>> res2 = res;
67     assert(res2.in1.content == 10);
68     assert(res2.in2.content == 0.);
69   }
70   {
71     std::ranges::in_in_result<MoveOnly, int> res{MoveOnly{}, 0};
72     assert(res.in1.get() == 1);
73     [[maybe_unused]] auto res2 = static_cast<std::ranges::in_in_result<MoveOnly, int>>(std::move(res));
74     assert(res.in1.get() == 0);
75   }
76   auto [in1, in2] = std::ranges::in_in_result<int, int>{1, 2};
77   assert(in1 == 1);
78   assert(in2 == 2);
79 
80   return true;
81 }
82 
83 int main(int, char**) {
84   test();
85   static_assert(test());
86 
87   return 0;
88 }
89