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 I1, class I2>
14 // struct min_max_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::min_max_result<A>, std::ranges::min_max_result<int>>);
32 
33 struct B {
34   B(const int&);
35   B(int&&);
36 };
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>, 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 static_assert(std::is_constructible_v<std::ranges::min_max_result<B>, const std::ranges::min_max_result<int>&>);
41 
42 struct C {
43   C(int&);
44 };
45 static_assert(!std::is_constructible_v<std::ranges::min_max_result<C>, std::ranges::min_max_result<int>&>);
46 
47 static_assert(std::is_convertible_v<std::ranges::min_max_result<int>&, std::ranges::min_max_result<long>>);
48 static_assert(std::is_convertible_v<const std::ranges::min_max_result<int>&, std::ranges::min_max_result<long>>);
49 static_assert(std::is_convertible_v<std::ranges::min_max_result<int>&&, std::ranges::min_max_result<long>>);
50 static_assert(std::is_convertible_v<const std::ranges::min_max_result<int>&&, std::ranges::min_max_result<long>>);
51 
52 struct NotConvertible {};
53 static_assert(!std::is_convertible_v<std::ranges::min_max_result<NotConvertible>, std::ranges::min_max_result<int>>);
54 
55 constexpr bool test() {
56   {
57     std::ranges::min_max_result<double> res{10, 1};
58     assert(res.min == 10);
59     assert(res.max == 1);
60     std::ranges::min_max_result<ConvertibleFrom<int>> res2 = res;
61     assert(res2.min.content == 10);
62     assert(res2.max.content == 1);
63   }
64   {
65     std::ranges::min_max_result<MoveOnly> res{MoveOnly{}, MoveOnly{}};
66     assert(res.min.get() == 1);
67     assert(res.max.get() == 1);
68     [[maybe_unused]] auto res2 = static_cast<std::ranges::min_max_result<MoveOnly>>(std::move(res));
69     assert(res.min.get() == 0);
70     assert(res.max.get() == 0);
71   }
72   auto [min, max] = std::ranges::min_max_result<int>{1, 2};
73   assert(min == 1);
74   assert(max == 2);
75 
76   return true;
77 }
78 
79 int main(int, char**) {
80   test();
81   static_assert(test());
82 
83   return 0;
84 }
85