1 //===----------------------------------------------------------------------===//
2 //
3 // The LLVM Compiler Infrastructure
4 //
5 // This file is dual licensed under the MIT and the University of Illinois Open
6 // Source Licenses. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9
10 // <algorithm>
11
12 // template<LessThanComparable T>
13 // pair<const T&, const T&>
14 // minmax(const T& a, const T& b);
15
16 #include <algorithm>
17 #include <cassert>
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()30 int main()
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