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 // <algorithm>
10
11 // template<class T, StrictWeakOrder<auto, T> Compare>
12 // requires !SameType<T, Compare> && CopyConstructible<Compare>
13 // pair<const T&, const T&>
14 // minmax(const T& a, const T& b, Compare comp);
15
16 #include <algorithm>
17 #include <cassert>
18 #include <functional>
19 #include <utility>
20
21 #include "test_macros.h"
22
23 template <class T, class C>
24 void
test(const T & a,const T & b,C c,const T & x,const T & y)25 test(const T& a, const T& b, C c, const T& x, const T& y)
26 {
27 std::pair<const T&, const T&> p = std::minmax(a, b, c);
28 assert(&p.first == &x);
29 assert(&p.second == &y);
30 }
31
32
main(int,char **)33 int main(int, char**)
34 {
35 {
36 int x = 0;
37 int y = 0;
38 test(x, y, std::greater<int>(), x, y);
39 test(y, x, std::greater<int>(), y, x);
40 }
41 {
42 int x = 0;
43 int y = 1;
44 test(x, y, std::greater<int>(), y, x);
45 test(y, x, std::greater<int>(), y, x);
46 }
47 {
48 int x = 1;
49 int y = 0;
50 test(x, y, std::greater<int>(), x, y);
51 test(y, x, std::greater<int>(), x, y);
52 }
53 #if TEST_STD_VER >= 14
54 {
55 // Note that you can't take a reference to a local var, since
56 // its address is not a compile-time constant.
57 constexpr static int x = 1;
58 constexpr static int y = 0;
59 constexpr auto p1 = std::minmax(x, y, std::greater<>());
60 static_assert(p1.first == x, "");
61 static_assert(p1.second == y, "");
62 constexpr auto p2 = std::minmax(y, x, std::greater<>());
63 static_assert(p2.first == x, "");
64 static_assert(p2.second == y, "");
65 }
66 #endif
67
68 return 0;
69 }
70