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-no-concepts
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 template <class T>
22 struct ConstructibleFrom {
23   constexpr ConstructibleFrom(T c) : content{c} {}
24   T content;
25 };
26 
27 struct A {
28   explicit A(int);
29 };
30 static_assert(!std::is_constructible_v<std::ranges::in_in_result<A, A>,
31                                        std::ranges::in_in_result<int, int>>);
32 
33 struct B {
34   B(const int&);
35   B(int&&);
36 };
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>, 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 static_assert(std::is_constructible_v<std::ranges::in_in_result<B, B>, const std::ranges::in_in_result<int, int>&>);
41 
42 struct C {
43   C(int&);
44 };
45 static_assert(!std::is_constructible_v<std::ranges::in_in_result<C, C>, std::ranges::in_in_result<int, int>&>);
46 
47 static_assert(std::is_convertible_v<         std::ranges::in_in_result<int, int>&, std::ranges::in_in_result<long, long>>);
48 static_assert(!std::is_nothrow_convertible_v<std::ranges::in_in_result<int, int>&, std::ranges::in_in_result<long, long>>);
49 static_assert(std::is_convertible_v<         const std::ranges::in_in_result<int, int>&, std::ranges::in_in_result<long, long>>);
50 static_assert(!std::is_nothrow_convertible_v<const std::ranges::in_in_result<int, int>&, std::ranges::in_in_result<long, long>>);
51 static_assert(std::is_convertible_v<         std::ranges::in_in_result<int, int>&&, std::ranges::in_in_result<long, long>>);
52 static_assert(!std::is_nothrow_convertible_v<std::ranges::in_in_result<int, int>&&, std::ranges::in_in_result<long, long>>);
53 static_assert(std::is_convertible_v<         const std::ranges::in_in_result<int, int>&&, std::ranges::in_in_result<long, long>>);
54 static_assert(!std::is_nothrow_convertible_v<const std::ranges::in_in_result<int, int>&&, std::ranges::in_in_result<long, long>>);
55 
56 struct NotConvertible {};
57 static_assert(!std::is_convertible_v<std::ranges::in_in_result<NotConvertible, int>,
58                                      std::ranges::in_in_result<int, int>>);
59 static_assert(!std::is_convertible_v<std::ranges::in_in_result<int, NotConvertible>,
60                                      std::ranges::in_in_result<int, int>>);
61 
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   auto [in1, in2] = std::ranges::in_in_result<int, int>{1, 2};
78   assert(in1 == 1);
79   assert(in2 == 2);
80 
81   return true;
82 }
83 
84 int main(int, char**) {
85   test();
86   static_assert(test());
87 
88   return 0;
89 }
90