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