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 
11 // Throwing bad_optional_access is supported starting in macosx10.13
12 // XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}} && !no-exceptions
13 
14 // <optional>
15 
16 // constexpr optional(T&& v);
17 
18 #include <optional>
19 #include <type_traits>
20 #include <cassert>
21 
22 #include "test_macros.h"
23 #include "archetypes.h"
24 
25 
26 using std::optional;
27 
28 
29 class Z
30 {
31 public:
32     Z(int) {}
33     Z(Z&&) {TEST_THROW(6);}
34 };
35 
36 
37 int main(int, char**)
38 {
39     {
40         typedef int T;
41         constexpr optional<T> opt(T(5));
42         static_assert(static_cast<bool>(opt) == true, "");
43         static_assert(*opt == 5, "");
44 
45         struct test_constexpr_ctor
46             : public optional<T>
47         {
48             constexpr test_constexpr_ctor(T&&) {}
49         };
50     }
51     {
52         typedef double T;
53         constexpr optional<T> opt(T(3));
54         static_assert(static_cast<bool>(opt) == true, "");
55         static_assert(*opt == 3, "");
56 
57         struct test_constexpr_ctor
58             : public optional<T>
59         {
60             constexpr test_constexpr_ctor(T&&) {}
61         };
62     }
63     {
64         const int x = 42;
65         optional<const int> o(std::move(x));
66         assert(*o == 42);
67     }
68     {
69         typedef TestTypes::TestType T;
70         T::reset();
71         optional<T> opt = T{3};
72         assert(T::alive == 1);
73         assert(T::move_constructed == 1);
74         assert(static_cast<bool>(opt) == true);
75         assert(opt.value().value == 3);
76     }
77     {
78         typedef ExplicitTestTypes::TestType T;
79         static_assert(!std::is_convertible<T&&, optional<T>>::value, "");
80         T::reset();
81         optional<T> opt(T{3});
82         assert(T::alive == 1);
83         assert(T::move_constructed == 1);
84         assert(static_cast<bool>(opt) == true);
85         assert(opt.value().value == 3);
86     }
87     {
88         typedef TestTypes::TestType T;
89         T::reset();
90         optional<T> opt = {3};
91         assert(T::alive == 1);
92         assert(T::value_constructed == 1);
93         assert(T::copy_constructed == 0);
94         assert(T::move_constructed == 0);
95         assert(static_cast<bool>(opt) == true);
96         assert(opt.value().value == 3);
97     }
98     {
99         typedef ConstexprTestTypes::TestType T;
100         constexpr optional<T> opt = {T(3)};
101         static_assert(static_cast<bool>(opt) == true, "");
102         static_assert(opt.value().value == 3, "");
103 
104         struct test_constexpr_ctor
105             : public optional<T>
106         {
107             constexpr test_constexpr_ctor(const T&) {}
108         };
109     }
110     {
111         typedef ConstexprTestTypes::TestType T;
112         constexpr optional<T> opt = {3};
113         static_assert(static_cast<bool>(opt) == true, "");
114         static_assert(opt.value().value == 3, "");
115 
116         struct test_constexpr_ctor
117             : public optional<T>
118         {
119             constexpr test_constexpr_ctor(const T&) {}
120         };
121     }
122     {
123         typedef ExplicitConstexprTestTypes::TestType T;
124         static_assert(!std::is_convertible<T&&, optional<T>>::value, "");
125         constexpr optional<T> opt(T{3});
126         static_assert(static_cast<bool>(opt) == true, "");
127         static_assert(opt.value().value == 3, "");
128 
129         struct test_constexpr_ctor
130             : public optional<T>
131         {
132             constexpr test_constexpr_ctor(T&&) {}
133         };
134 
135     }
136 #ifndef TEST_HAS_NO_EXCEPTIONS
137     {
138         try
139         {
140             Z z(3);
141             optional<Z> opt(std::move(z));
142             assert(false);
143         }
144         catch (int i)
145         {
146             assert(i == 6);
147         }
148     }
149 #endif
150 
151   return 0;
152 }
153