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, c++14
11
12 // <optional>
13
14 // constexpr optional(const T& v);
15
16 #include <optional>
17 #include <type_traits>
18 #include <cassert>
19
20 #include "test_macros.h"
21 #include "archetypes.hpp"
22
23 using std::optional;
24
main()25 int main()
26 {
27 {
28 typedef int T;
29 constexpr T t(5);
30 constexpr optional<T> opt(t);
31 static_assert(static_cast<bool>(opt) == true, "");
32 static_assert(*opt == 5, "");
33
34 struct test_constexpr_ctor
35 : public optional<T>
36 {
37 constexpr test_constexpr_ctor(const T&) {}
38 };
39
40 }
41 {
42 typedef double T;
43 constexpr T t(3);
44 constexpr optional<T> opt(t);
45 static_assert(static_cast<bool>(opt) == true, "");
46 static_assert(*opt == 3, "");
47
48 struct test_constexpr_ctor
49 : public optional<T>
50 {
51 constexpr test_constexpr_ctor(const T&) {}
52 };
53
54 }
55 {
56 const int x = 42;
57 optional<const int> o(x);
58 assert(*o == x);
59 }
60 {
61 typedef TestTypes::TestType T;
62 T::reset();
63 const T t(3);
64 optional<T> opt = t;
65 assert(T::alive == 2);
66 assert(T::copy_constructed == 1);
67 assert(static_cast<bool>(opt) == true);
68 assert(opt.value().value == 3);
69 }
70 {
71 typedef ExplicitTestTypes::TestType T;
72 static_assert(!std::is_convertible<T const&, optional<T>>::value, "");
73 T::reset();
74 const T t(3);
75 optional<T> opt(t);
76 assert(T::alive == 2);
77 assert(T::copy_constructed == 1);
78 assert(static_cast<bool>(opt) == true);
79 assert(opt.value().value == 3);
80 }
81 {
82 typedef ConstexprTestTypes::TestType T;
83 constexpr T t(3);
84 constexpr optional<T> opt = {t};
85 static_assert(static_cast<bool>(opt) == true, "");
86 static_assert(opt.value().value == 3, "");
87
88 struct test_constexpr_ctor
89 : public optional<T>
90 {
91 constexpr test_constexpr_ctor(const T&) {}
92 };
93 }
94 {
95 typedef ExplicitConstexprTestTypes::TestType T;
96 static_assert(!std::is_convertible<const T&, optional<T>>::value, "");
97 constexpr T t(3);
98 constexpr optional<T> opt(t);
99 static_assert(static_cast<bool>(opt) == true, "");
100 static_assert(opt.value().value == 3, "");
101
102 struct test_constexpr_ctor
103 : public optional<T>
104 {
105 constexpr test_constexpr_ctor(const T&) {}
106 };
107
108 }
109 #ifndef TEST_HAS_NO_EXCEPTIONS
110 {
111 struct Z {
112 Z(int) {}
113 Z(const Z&) {throw 6;}
114 };
115 typedef Z T;
116 try
117 {
118 const T t(3);
119 optional<T> opt(t);
120 assert(false);
121 }
122 catch (int i)
123 {
124 assert(i == 6);
125 }
126 }
127 #endif
128 }
129