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 // <optional>
11
12 // template <class T> constexpr bool operator<= (const optional<T>& x, const optional<T>& y);
13
14 #include <experimental/optional>
15
16 #if _LIBCPP_STD_VER > 11
17
18 using std::experimental::optional;
19
20 struct X
21 {
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 #endif
31
main()32 int main()
33 {
34 #if _LIBCPP_STD_VER > 11
35 {
36 typedef optional<X> O;
37
38 constexpr O o1; // disengaged
39 constexpr O o2; // disengaged
40 constexpr O o3{1}; // engaged
41 constexpr O o4{2}; // engaged
42 constexpr O o5{1}; // engaged
43
44 static_assert ( (o1 <= o1), "" );
45 static_assert ( (o1 <= o2), "" );
46 static_assert ( (o1 <= o3), "" );
47 static_assert ( (o1 <= o4), "" );
48 static_assert ( (o1 <= o5), "" );
49
50 static_assert ( (o2 <= o1), "" );
51 static_assert ( (o2 <= o2), "" );
52 static_assert ( (o2 <= o3), "" );
53 static_assert ( (o2 <= o4), "" );
54 static_assert ( (o2 <= o5), "" );
55
56 static_assert ( !(o3 <= o1), "" );
57 static_assert ( !(o3 <= o2), "" );
58 static_assert ( (o3 <= o3), "" );
59 static_assert ( (o3 <= o4), "" );
60 static_assert ( (o3 <= o5), "" );
61
62 static_assert ( !(o4 <= o1), "" );
63 static_assert ( !(o4 <= o2), "" );
64 static_assert ( !(o4 <= o3), "" );
65 static_assert ( (o4 <= o4), "" );
66 static_assert ( !(o4 <= o5), "" );
67
68 static_assert ( !(o5 <= o1), "" );
69 static_assert ( !(o5 <= o2), "" );
70 static_assert ( (o5 <= o3), "" );
71 static_assert ( (o5 <= o4), "" );
72 static_assert ( (o5 <= o5), "" );
73 }
74 #endif
75 }
76