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 {
ConvertibleFromConvertibleFrom58 constexpr ConvertibleFrom(T c) : content{c} {}
59 T content;
60 };
61
test()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
main(int,char **)90 int main(int, char**) {
91 test();
92 static_assert(test());
93
94 return 0;
95 }
96