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 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::min_max_result<A>, std::ranges::min_max_result<int>>);
31 
32 struct B {
33   B(const int&);
34   B(int&&);
35 };
36 static_assert(std::is_constructible_v<std::ranges::min_max_result<B>, std::ranges::min_max_result<int>>);
37 static_assert(std::is_constructible_v<std::ranges::min_max_result<B>, std::ranges::min_max_result<int>&>);
38 static_assert(std::is_constructible_v<std::ranges::min_max_result<B>, const std::ranges::min_max_result<int>>);
39 static_assert(std::is_constructible_v<std::ranges::min_max_result<B>, const std::ranges::min_max_result<int>&>);
40 
41 struct C {
42   C(int&);
43 };
44 static_assert(!std::is_constructible_v<std::ranges::min_max_result<C>, std::ranges::min_max_result<int>&>);
45 
46 static_assert(std::is_convertible_v<std::ranges::min_max_result<int>&, std::ranges::min_max_result<long>>);
47 static_assert(std::is_convertible_v<const std::ranges::min_max_result<int>&, std::ranges::min_max_result<long>>);
48 static_assert(std::is_convertible_v<std::ranges::min_max_result<int>&&, std::ranges::min_max_result<long>>);
49 static_assert(std::is_convertible_v<const std::ranges::min_max_result<int>&&, std::ranges::min_max_result<long>>);
50 
51 struct NotConvertible {};
52 static_assert(!std::is_convertible_v<std::ranges::min_max_result<NotConvertible>, std::ranges::min_max_result<int>>);
53 
54 constexpr bool test() {
55   {
56     std::ranges::min_max_result<double> res{10, 1};
57     assert(res.min == 10);
58     assert(res.max == 1);
59     std::ranges::min_max_result<ConvertibleFrom<int>> res2 = res;
60     assert(res2.min.content == 10);
61     assert(res2.max.content == 1);
62   }
63   {
64     std::ranges::min_max_result<MoveOnly> res{MoveOnly{}, MoveOnly{}};
65     assert(res.min.get() == 1);
66     assert(res.max.get() == 1);
67     [[maybe_unused]] auto res2 = static_cast<std::ranges::min_max_result<MoveOnly>>(std::move(res));
68     assert(res.min.get() == 0);
69     assert(res.max.get() == 0);
70   }
71   auto [min, max] = std::ranges::min_max_result<int>{1, 2};
72   assert(min == 1);
73   assert(max == 2);
74 
75   return true;
76 }
77 
78 int main(int, char**) {
79   test();
80   static_assert(test());
81 
82   return 0;
83 }
84