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 I>
13 // struct in_found_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_found_result<A>, std::ranges::in_found_result<int>>);
26
27 struct B {
28 B(const int&);
29 B(int&&);
30 };
31 // implicit conversion
32 static_assert(std::is_constructible_v<std::ranges::in_found_result<B>, std::ranges::in_found_result<int>>);
33 static_assert(std::is_constructible_v<std::ranges::in_found_result<B>, std::ranges::in_found_result<int>&>);
34 static_assert(std::is_constructible_v<std::ranges::in_found_result<B>, const std::ranges::in_found_result<int>>);
35 static_assert(std::is_constructible_v<std::ranges::in_found_result<B>, const std::ranges::in_found_result<int>&>);
36
37 struct C {
38 C(int&);
39 };
40 static_assert(!std::is_constructible_v<std::ranges::in_found_result<C>, std::ranges::in_found_result<int>&>);
41
42 // has to be convertible via const&
43 static_assert(std::is_convertible_v<std::ranges::in_found_result<int>&, std::ranges::in_found_result<long>>);
44 static_assert(std::is_convertible_v<const std::ranges::in_found_result<int>&, std::ranges::in_found_result<long>>);
45 static_assert(std::is_convertible_v<std::ranges::in_found_result<int>&&, std::ranges::in_found_result<long>>);
46 static_assert(std::is_convertible_v<const std::ranges::in_found_result<int>&&, std::ranges::in_found_result<long>>);
47
48 // should be move constructible
49 static_assert(std::is_move_constructible_v<std::ranges::in_found_result<MoveOnly>>);
50
51 // should not be copy constructible
52 static_assert(!std::is_copy_constructible_v<std::ranges::in_found_result<MoveOnly>>);
53
54 struct NotConvertible {};
55 // conversions should not work if there is no conversion
56 static_assert(!std::is_convertible_v<std::ranges::in_found_result<NotConvertible>, std::ranges::in_found_result<int>>);
57
58 static_assert(std::is_same_v<decltype(std::ranges::in_found_result<int>::in), int>);
59 static_assert(std::is_same_v<decltype(std::ranges::in_found_result<int>::found), bool>);
60
61 template <class T>
62 struct ConvertibleFrom {
ConvertibleFromConvertibleFrom63 constexpr ConvertibleFrom(T c) : content{c} {}
64 T content;
65 };
66
test()67 constexpr bool test() {
68 {
69 std::ranges::in_found_result<double> res{10, true};
70 assert(res.in == 10);
71 assert(res.found == true);
72 std::ranges::in_found_result<ConvertibleFrom<int>> res2 = res;
73 assert(res2.in.content == 10);
74 assert(res2.found == true);
75 }
76 {
77 std::ranges::in_found_result<MoveOnly> res{MoveOnly{}, false};
78 assert(res.in.get() == 1);
79 assert(!res.found);
80 auto res2 = std::move(res);
81 assert(res2.in.get() == 1);
82 assert(!res2.found);
83 assert(res.in.get() == 0);
84 assert(!res.found);
85 }
86 auto [in, found] = std::ranges::in_found_result<int>{2, false};
87 assert(in == 2);
88 assert(!found);
89
90 return true;
91 }
92
main(int,char **)93 int main(int, char**) {
94 test();
95 static_assert(test());
96
97 return 0;
98 }
99