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
10 // <optional>
11
12 // template <class T, class U> constexpr bool operator<=(const optional<T>& x, const U& v);
13 // template <class T, class U> constexpr bool operator<=(const U& v, const optional<T>& x);
14
15 #include <optional>
16
17 #include "test_macros.h"
18
19 using std::optional;
20
21 struct X {
22 int i_;
23
XX24 constexpr X(int i) : i_(i) {}
25 };
26
operator <=(const X & lhs,const X & rhs)27 constexpr bool operator<=(const X& lhs, const X& rhs) {
28 return lhs.i_ <= rhs.i_;
29 }
30
main(int,char **)31 int main(int, char**) {
32 {
33 typedef X T;
34 typedef optional<T> O;
35
36 constexpr T val(2);
37 constexpr O o1; // disengaged
38 constexpr O o2{1}; // engaged
39 constexpr O o3{val}; // engaged
40
41 static_assert((o1 <= T(1)), "");
42 static_assert((o2 <= T(1)), ""); // equal
43 static_assert(!(o3 <= T(1)), "");
44 static_assert((o2 <= val), "");
45 static_assert((o3 <= val), ""); // equal
46 static_assert((o3 <= T(3)), "");
47
48 static_assert(!(T(1) <= o1), "");
49 static_assert((T(1) <= o2), ""); // equal
50 static_assert((T(1) <= o3), "");
51 static_assert(!(val <= o2), "");
52 static_assert((val <= o3), ""); // equal
53 static_assert(!(T(3) <= o3), "");
54 }
55 {
56 using O = optional<int>;
57 constexpr O o1(42);
58 static_assert(o1 <= 42l, "");
59 static_assert(!(101l <= o1), "");
60 }
61 {
62 using O = optional<const int>;
63 constexpr O o1(42);
64 static_assert(o1 <= 42, "");
65 static_assert(!(101 <= o1), "");
66 }
67
68 return 0;
69 }
70