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