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 O1>
13 // struct in_out_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_out_result<A, A>, std::ranges::in_out_result<int, int>>);
26 
27 struct B {
28   B(int);
29 };
30 // implicit conversion
31 static_assert(std::is_constructible_v<std::ranges::in_out_result<B, B>, std::ranges::in_out_result<int, int>>);
32 static_assert(std::is_constructible_v<std::ranges::in_out_result<B, B>, std::ranges::in_out_result<int, int>&>);
33 static_assert(std::is_constructible_v<std::ranges::in_out_result<B, B>, const std::ranges::in_out_result<int, int>>);
34 static_assert(std::is_constructible_v<std::ranges::in_out_result<B, B>, const std::ranges::in_out_result<int, int>&>);
35 
36 struct C {
37   C(int&);
38 };
39 static_assert(!std::is_constructible_v<std::ranges::in_out_result<C, C>, std::ranges::in_out_result<int, int>&>);
40 
41 // has to be convertible via const&
42 static_assert(std::is_convertible_v<std::ranges::in_out_result<int, int>&, std::ranges::in_out_result<long, long>>);
43 static_assert(std::is_convertible_v<const std::ranges::in_out_result<int, int>&, std::ranges::in_out_result<long, long>>);
44 static_assert(std::is_convertible_v<std::ranges::in_out_result<int, int>&&, std::ranges::in_out_result<long, long>>);
45 static_assert(std::is_convertible_v<const std::ranges::in_out_result<int, int>&&, std::ranges::in_out_result<long, long>>);
46 
47 // should be move constructible
48 static_assert(std::is_move_constructible_v<std::ranges::in_out_result<MoveOnly, int>>);
49 static_assert(std::is_move_constructible_v<std::ranges::in_out_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_out_result<NotConvertible, int>, std::ranges::in_out_result<int, NotConvertible>>);
54 static_assert(!std::is_convertible_v<std::ranges::in_out_result<int, NotConvertible>, std::ranges::in_out_result<NotConvertible, int>>);
55 
56 template <class T>
57 struct ConvertibleFrom {
58   constexpr ConvertibleFrom(T c) : content{c} {}
59   T content;
60 };
61 
62 constexpr bool test() {
63   {
64     std::ranges::in_out_result<double, int> res{10, 1};
65     assert(res.in == 10);
66     assert(res.out == 1);
67     std::ranges::in_out_result<ConvertibleFrom<double>, ConvertibleFrom<int>> res2 = res;
68     assert(res2.in.content == 10);
69     assert(res2.out.content == 1);
70   }
71   {
72     std::ranges::in_out_result<MoveOnly, int> res{MoveOnly{}, 10};
73     assert(res.in.get() == 1);
74     assert(res.out == 10);
75     auto res2 = std::move(res);
76     assert(res.in.get() == 0);
77     assert(res.out == 10);
78     assert(res2.in.get() == 1);
79     assert(res2.out == 10);
80   }
81   {
82     auto [min, max] = std::ranges::in_out_result<int, int>{1, 2};
83     assert(min == 1);
84     assert(max == 2);
85   }
86 
87   return true;
88 }
89 
90 int main(int, char**) {
91   test();
92   static_assert(test());
93 
94   return 0;
95 }
96