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 // UNSUPPORTED: libcpp-has-no-incomplete-ranges
12 
13 // template <class I1, class I2>
14 // struct in_fun_result;
15 
16 #include <algorithm>
17 #include <cassert>
18 #include <type_traits>
19 #include <utility>
20 
21 #include "MoveOnly.h"
22 
23 struct A {
24   explicit A(int);
25 };
26 // no implicit conversion
27 static_assert(!std::is_constructible_v<std::ranges::in_fun_result<A, A>, std::ranges::in_fun_result<int, int>>);
28 
29 struct B {
30   B(int);
31 };
32 // implicit conversion
33 static_assert(std::is_constructible_v<std::ranges::in_fun_result<B, B>, std::ranges::in_fun_result<int, int>>);
34 static_assert(std::is_constructible_v<std::ranges::in_fun_result<B, B>, std::ranges::in_fun_result<int, int>&>);
35 static_assert(std::is_constructible_v<std::ranges::in_fun_result<B, B>, const std::ranges::in_fun_result<int, int>>);
36 static_assert(std::is_constructible_v<std::ranges::in_fun_result<B, B>, const std::ranges::in_fun_result<int, int>&>);
37 
38 struct C {
39   C(int&);
40 };
41 // has to be convertible via const&
42 static_assert(!std::is_constructible_v<std::ranges::in_fun_result<C, C>, std::ranges::in_fun_result<int, int>&>);
43 
44 static_assert(std::is_convertible_v<std::ranges::in_fun_result<int, int>&, std::ranges::in_fun_result<long, long>>);
45 static_assert(std::is_convertible_v<const std::ranges::in_fun_result<int, int>&, std::ranges::in_fun_result<long, long>>);
46 static_assert(std::is_convertible_v<std::ranges::in_fun_result<int, int>&&, std::ranges::in_fun_result<long, long>>);
47 static_assert(std::is_convertible_v<const std::ranges::in_fun_result<int, int>&&, std::ranges::in_fun_result<long, long>>);
48 
49 // should be move constructible
50 static_assert(std::is_move_constructible_v<std::ranges::in_fun_result<MoveOnly, int>>);
51 static_assert(std::is_move_constructible_v<std::ranges::in_fun_result<int, MoveOnly>>);
52 
53 // should not copy constructible with move-only type
54 static_assert(!std::is_copy_constructible_v<std::ranges::in_fun_result<MoveOnly, int>>);
55 static_assert(!std::is_copy_constructible_v<std::ranges::in_fun_result<int, MoveOnly>>);
56 
57 struct NotConvertible {};
58 // conversions should not work if there is no conversion
59 static_assert(!std::is_convertible_v<std::ranges::in_fun_result<NotConvertible, int>,
60                                      std::ranges::in_fun_result<int, int>>);
61 static_assert(!std::is_convertible_v<std::ranges::in_fun_result<int, NotConvertible>,
62                                      std::ranges::in_fun_result<int, int>>);
63 
64 template <class T>
65 struct ConvertibleFrom {
66   constexpr ConvertibleFrom(T c) : content{c} {}
67   T content;
68 };
69 
70 constexpr bool test() {
71   {
72     std::ranges::in_fun_result<int, double> res{10, 0.};
73     assert(res.in == 10);
74     assert(res.fun == 0.);
75     std::ranges::in_fun_result<ConvertibleFrom<int>, ConvertibleFrom<double>> res2 = res;
76     assert(res2.in.content == 10);
77     assert(res2.fun.content == 0.);
78   }
79   {
80     std::ranges::in_fun_result<MoveOnly, int> res{MoveOnly{}, 2};
81     assert(res.in.get() == 1);
82     assert(res.fun == 2);
83     auto res2 = static_cast<std::ranges::in_fun_result<MoveOnly, int>>(std::move(res));
84     assert(res.in.get() == 0);
85     assert(res2.in.get() == 1);
86     assert(res2.fun == 2);
87   }
88   {
89     auto [in, fun] = std::ranges::in_fun_result<int, int>{1, 2};
90     assert(in == 1);
91     assert(fun == 2);
92   }
93   return true;
94 }
95 
96 int main(int, char**) {
97   test();
98   static_assert(test());
99 
100   return 0;
101 }
102