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