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 && x86_64-apple-macosx10.12 && !no-exceptions
13 // XFAIL: use_system_cxx_lib && x86_64-apple-macosx10.11 && !no-exceptions
14 // XFAIL: use_system_cxx_lib && x86_64-apple-macosx10.10 && !no-exceptions
15 // XFAIL: use_system_cxx_lib && x86_64-apple-macosx10.9 && !no-exceptions
16 
17 // <optional>
18 
19 // template <class U>
20 //   constexpr EXPLICIT optional(U&& u);
21 
22 #include <optional>
23 #include <type_traits>
24 #include <cassert>
25 
26 #include "test_macros.h"
27 #include "archetypes.h"
28 #include "test_convertible.h"
29 
30 
31 using std::optional;
32 
33 struct ImplicitThrow
34 {
35     constexpr ImplicitThrow(int x) { if (x != -1) TEST_THROW(6);}
36 };
37 
38 struct ExplicitThrow
39 {
40     constexpr explicit ExplicitThrow(int x) { if (x != -1) TEST_THROW(6);}
41 };
42 
43 struct ImplicitAny {
44   template <class U>
45   constexpr ImplicitAny(U&&) {}
46 };
47 
48 
49 template <class To, class From>
50 constexpr bool implicit_conversion(optional<To>&& opt, const From& v)
51 {
52     using O = optional<To>;
53     static_assert(test_convertible<O, From>(), "");
54     static_assert(!test_convertible<O, void*>(), "");
55     static_assert(!test_convertible<O, From, int>(), "");
56     return opt && *opt == static_cast<To>(v);
57 }
58 
59 template <class To, class Input, class Expect>
60 constexpr bool explicit_conversion(Input&& in, const Expect& v)
61 {
62     using O = optional<To>;
63     static_assert(std::is_constructible<O, Input>::value, "");
64     static_assert(!std::is_convertible<Input, O>::value, "");
65     static_assert(!std::is_constructible<O, void*>::value, "");
66     static_assert(!std::is_constructible<O, Input, int>::value, "");
67     optional<To> opt(std::forward<Input>(in));
68     return opt && *opt == static_cast<To>(v);
69 }
70 
71 void test_implicit()
72 {
73     {
74         static_assert(implicit_conversion<long long>(42, 42), "");
75     }
76     {
77         static_assert(implicit_conversion<long double>(3.14, 3.14), "");
78     }
79     {
80         int x = 42;
81         optional<void* const> o(&x);
82         assert(*o == &x);
83     }
84     {
85         using T = TrivialTestTypes::TestType;
86         static_assert(implicit_conversion<T>(42, 42), "");
87     }
88     {
89         using T = TestTypes::TestType;
90         assert(implicit_conversion<T>(3, T(3)));
91     }
92   {
93     using O = optional<ImplicitAny>;
94     static_assert(!test_convertible<O, std::in_place_t>(), "");
95     static_assert(!test_convertible<O, std::in_place_t&>(), "");
96     static_assert(!test_convertible<O, const std::in_place_t&>(), "");
97     static_assert(!test_convertible<O, std::in_place_t&&>(), "");
98     static_assert(!test_convertible<O, const std::in_place_t&&>(), "");
99 
100   }
101 #ifndef TEST_HAS_NO_EXCEPTIONS
102     {
103         try {
104             using T = ImplicitThrow;
105             optional<T> t = 42;
106             assert(false);
107             ((void)t);
108         } catch (int) {
109         }
110     }
111 #endif
112 }
113 
114 void test_explicit() {
115     {
116         using T = ExplicitTrivialTestTypes::TestType;
117         static_assert(explicit_conversion<T>(42, 42), "");
118     }
119     {
120         using T = ExplicitConstexprTestTypes::TestType;
121         static_assert(explicit_conversion<T>(42, 42), "");
122         static_assert(!std::is_convertible<int, T>::value, "");
123     }
124     {
125         using T = ExplicitTestTypes::TestType;
126         T::reset();
127         {
128             assert(explicit_conversion<T>(42, 42));
129             assert(T::alive == 0);
130         }
131         T::reset();
132         {
133             optional<T> t(42);
134             assert(T::alive == 1);
135             assert(T::value_constructed == 1);
136             assert(T::move_constructed == 0);
137             assert(T::copy_constructed == 0);
138             assert(t.value().value == 42);
139         }
140         assert(T::alive == 0);
141     }
142 #ifndef TEST_HAS_NO_EXCEPTIONS
143     {
144         try {
145             using T = ExplicitThrow;
146             optional<T> t(42);
147             assert(false);
148         } catch (int) {
149         }
150     }
151 #endif
152 }
153 
154 int main(int, char**) {
155     test_implicit();
156     test_explicit();
157 
158   return 0;
159 }
160