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 I>
14 // struct in_found_result;
15 
16 #include <algorithm>
17 #include <cassert>
18 #include <type_traits>
19 
20 #include "MoveOnly.h"
21 
22 template <class T>
23 struct ConvertibleFrom {
24   constexpr ConvertibleFrom(T c) : content{c} {}
25   T content;
26 };
27 
28 struct A {
29   explicit A(int);
30 };
31 static_assert(!std::is_constructible_v<std::ranges::in_found_result<A>, std::ranges::in_found_result<int>>);
32 
33 struct B {
34   B(const int&);
35   B(int&&);
36 };
37 static_assert(std::is_constructible_v<std::ranges::in_found_result<B>, std::ranges::in_found_result<int>>);
38 static_assert(std::is_constructible_v<std::ranges::in_found_result<B>, std::ranges::in_found_result<int>&>);
39 static_assert(std::is_constructible_v<std::ranges::in_found_result<B>, const std::ranges::in_found_result<int>>);
40 static_assert(std::is_constructible_v<std::ranges::in_found_result<B>, const std::ranges::in_found_result<int>&>);
41 
42 struct C {
43   C(int&);
44 };
45 static_assert(!std::is_constructible_v<std::ranges::in_found_result<C>, std::ranges::in_found_result<int>&>);
46 
47 static_assert(std::is_convertible_v<std::ranges::in_found_result<int>&, std::ranges::in_found_result<long>>);
48 static_assert(std::is_convertible_v<const std::ranges::in_found_result<int>&, std::ranges::in_found_result<long>>);
49 static_assert(std::is_convertible_v<std::ranges::in_found_result<int>&&, std::ranges::in_found_result<long>>);
50 static_assert(std::is_convertible_v<const std::ranges::in_found_result<int>&&, std::ranges::in_found_result<long>>);
51 
52 struct NotConvertible {};
53 static_assert(!std::is_convertible_v<std::ranges::in_found_result<NotConvertible>, std::ranges::in_found_result<int>>);
54 
55 static_assert(std::is_same_v<decltype(std::ranges::in_found_result<int>::in), int>);
56 static_assert(std::is_same_v<decltype(std::ranges::in_found_result<int>::found), bool>);
57 
58 constexpr bool test() {
59   {
60     std::ranges::in_found_result<double> res{10, true};
61     assert(res.in == 10);
62     assert(res.found == true);
63     std::ranges::in_found_result<ConvertibleFrom<int>> res2 = res;
64     assert(res2.in.content == 10);
65     assert(res2.found);
66   }
67   {
68     std::ranges::in_found_result<MoveOnly> res{MoveOnly{}, false};
69     assert(res.in.get() == 1);
70     assert(!res.found);
71     auto res2 = std::move(res);
72     assert(res2.in.get() == 1);
73     assert(!res2.found);
74     assert(res.in.get() == 0);
75     assert(!res.found);
76   }
77   auto [in, found] = std::ranges::in_found_result<int>{2, false};
78   assert(in == 2);
79   assert(!found);
80 
81   return true;
82 }
83 
84 int main(int, char**) {
85   test();
86   static_assert(test());
87 
88   return 0;
89 }
90