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 // UNSUPPORTED: c++98, c++03, c++11
11
12 // <optional>
13
14 // constexpr optional(const T& v);
15
16 #include <experimental/optional>
17 #include <type_traits>
18 #include <cassert>
19
20 #include "test_macros.h"
21
22 using std::experimental::optional;
23
24 class X
25 {
26 int i_;
27 public:
X(int i)28 X(int i) : i_(i) {}
29
operator ==(const X & x,const X & y)30 friend bool operator==(const X& x, const X& y) {return x.i_ == y.i_;}
31 };
32
33 class Y
34 {
35 int i_;
36 public:
Y(int i)37 constexpr Y(int i) : i_(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 public:
Z(int)45 Z(int) {}
Z(const Z &)46 Z(const Z&) {TEST_THROW(6);}
47 };
48
49
main()50 int main()
51 {
52 {
53 typedef int T;
54 constexpr T t(5);
55 constexpr optional<T> opt(t);
56 static_assert(static_cast<bool>(opt) == true, "");
57 static_assert(*opt == 5, "");
58
59 struct test_constexpr_ctor
60 : public optional<T>
61 {
62 constexpr test_constexpr_ctor(const T&) {}
63 };
64
65 }
66 {
67 typedef double T;
68 constexpr T t(3);
69 constexpr optional<T> opt(t);
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(const T&) {}
77 };
78
79 }
80 {
81 typedef X T;
82 const T t(3);
83 optional<T> opt(t);
84 assert(static_cast<bool>(opt) == true);
85 assert(*opt == 3);
86 }
87 {
88 typedef Y T;
89 constexpr T t(3);
90 constexpr optional<T> opt(t);
91 static_assert(static_cast<bool>(opt) == true, "");
92 static_assert(*opt == 3, "");
93
94 struct test_constexpr_ctor
95 : public optional<T>
96 {
97 constexpr test_constexpr_ctor(const T&) {}
98 };
99
100 }
101 #ifndef TEST_HAS_NO_EXCEPTIONS
102 {
103 typedef Z T;
104 try
105 {
106 const T t(3);
107 optional<T> opt(t);
108 assert(false);
109 }
110 catch (int i)
111 {
112 assert(i == 6);
113 }
114 }
115 #endif
116 }
117