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