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 // constexpr optional(T&& v);
13
14 #include <experimental/optional>
15 #include <type_traits>
16 #include <cassert>
17
18 #if _LIBCPP_STD_VER > 11
19
20 using std::experimental::optional;
21
22 class X
23 {
24 int i_;
25 public:
X(int i)26 X(int i) : i_(i) {}
X(X && x)27 X(X&& x) : i_(x.i_) {}
28
operator ==(const X & x,const X & y)29 friend bool operator==(const X& x, const X& y) {return x.i_ == y.i_;}
30 };
31
32 class Y
33 {
34 int i_;
35 public:
Y(int i)36 constexpr Y(int i) : i_(i) {}
Y(Y && x)37 constexpr Y(Y&& x) : i_(x.i_) {}
38
operator ==(const Y & x,const Y & y)39 friend constexpr bool operator==(const Y& x, const Y& y) {return x.i_ == y.i_;}
40 };
41
42 class Z
43 {
44 int i_;
45 public:
Z(int i)46 Z(int i) : i_(i) {}
Z(Z &&)47 Z(Z&&) {throw 6;}
48 };
49
50 #endif // _LIBCPP_STD_VER > 11
51
main()52 int main()
53 {
54 #if _LIBCPP_STD_VER > 11
55 {
56 typedef int T;
57 constexpr optional<T> opt(T(5));
58 static_assert(static_cast<bool>(opt) == true, "");
59 static_assert(*opt == 5, "");
60
61 struct test_constexpr_ctor
62 : public optional<T>
63 {
64 constexpr test_constexpr_ctor(T&&) {}
65 };
66 }
67 {
68 typedef double T;
69 constexpr optional<T> opt(T(3));
70 static_assert(static_cast<bool>(opt) == true, "");
71 static_assert(*opt == 3, "");
72
73 struct test_constexpr_ctor
74 : public optional<T>
75 {
76 constexpr test_constexpr_ctor(T&&) {}
77 };
78 }
79 {
80 typedef X T;
81 optional<T> opt(T(3));
82 assert(static_cast<bool>(opt) == true);
83 assert(*opt == 3);
84 }
85 {
86 typedef Y T;
87 constexpr optional<T> opt(T(3));
88 static_assert(static_cast<bool>(opt) == true, "");
89 static_assert(*opt == 3, "");
90
91 struct test_constexpr_ctor
92 : public optional<T>
93 {
94 constexpr test_constexpr_ctor(T&&) {}
95 };
96 }
97 {
98 typedef Z T;
99 try
100 {
101 optional<T> opt(T(3));
102 assert(false);
103 }
104 catch (int i)
105 {
106 assert(i == 6);
107 }
108 }
109 #endif // _LIBCPP_STD_VER > 11
110 }
111