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
11// template <class I>
12// struct in_found_result;
13
14#include <algorithm>
15#include <cassert>
16#include <type_traits>
17
18#include "MoveOnly.h"
19
20struct A {
21 explicit A(int);
22};
23// no implicit conversion
24static_assert(!std::is_constructible_v<std::ranges::in_found_result<A>, std::ranges::in_found_result<int>>);
25
26struct B {
27 B(const int&);
28 B(int&&);
29};
30// implicit conversion
31static_assert(std::is_constructible_v<std::ranges::in_found_result<B>, std::ranges::in_found_result<int>>);
32static_assert(std::is_constructible_v<std::ranges::in_found_result<B>, std::ranges::in_found_result<int>&>);
33static_assert(std::is_constructible_v<std::ranges::in_found_result<B>, const std::ranges::in_found_result<int>>);
34static_assert(std::is_constructible_v<std::ranges::in_found_result<B>, const std::ranges::in_found_result<int>&>);
35
36struct C {
37 C(int&);
38};
39static_assert(!std::is_constructible_v<std::ranges::in_found_result<C>, std::ranges::in_found_result<int>&>);
40
41// has to be convertible via const&
42static_assert(std::is_convertible_v<std::ranges::in_found_result<int>&, std::ranges::in_found_result<long>>);
43static_assert(std::is_convertible_v<const std::ranges::in_found_result<int>&, std::ranges::in_found_result<long>>);
44static_assert(std::is_convertible_v<std::ranges::in_found_result<int>&&, std::ranges::in_found_result<long>>);
45static_assert(std::is_convertible_v<const std::ranges::in_found_result<int>&&, std::ranges::in_found_result<long>>);
46
47// should be move constructible
48static_assert(std::is_move_constructible_v<std::ranges::in_found_result<MoveOnly>>);
49
50// should not be copy constructible
51static_assert(!std::is_copy_constructible_v<std::ranges::in_found_result<MoveOnly>>);
52
53struct NotConvertible {};
54// conversions should not work if there is no conversion
55static_assert(!std::is_convertible_v<std::ranges::in_found_result<NotConvertible>, std::ranges::in_found_result<int>>);
56
57static_assert(std::is_same_v<decltype(std::ranges::in_found_result<int>::in), int>);
58static_assert(std::is_same_v<decltype(std::ranges::in_found_result<int>::found), bool>);
59
60template <class T>
61struct ConvertibleFrom {
62 constexpr ConvertibleFrom(T c) : content{c} {}
63 T content;
64};
65
66constexpr bool test() {
67 // Checks that conversion operations are correct.
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 // Checks that conversions are possible when one of the types is move-only.
78 {
79 std::ranges::in_found_result<MoveOnly> res{MoveOnly{}, false};
80 assert(res.in.get() == 1);
81 assert(!res.found);
82 auto res2 = std::move(res);
83 assert(res2.in.get() == 1);
84 assert(!res2.found);
85 assert(res.in.get() == 0);
86 assert(!res.found);
87 }
88
89 // Checks that structured bindings get the correct values.
90 {
91 auto [in, found] = std::ranges::in_found_result<int>{2, false};
92 assert(in == 2);
93 assert(!found);
94 }
95 return true;
96}
97
98int main(int, char**) {
99 test();
100 static_assert(test());
101
102 return 0;
103}
104

source code of libcxx/test/std/algorithms/algorithms.results/in_found_result.pass.cpp