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 // XFAIL: availability=macosx10.13
13 // XFAIL: availability=macosx10.12
14 // XFAIL: availability=macosx10.11
15 // XFAIL: availability=macosx10.10
16 // XFAIL: availability=macosx10.9
17 // XFAIL: availability=macosx10.8
18 // XFAIL: availability=macosx10.7
19
20 // <optional>
21
22 // constexpr optional(optional<T>&& rhs);
23
24 #include <optional>
25 #include <type_traits>
26 #include <cassert>
27
28 #include "test_macros.h"
29 #include "archetypes.hpp"
30
31 using std::optional;
32
33 template <class T, class ...InitArgs>
test(InitArgs &&...args)34 void test(InitArgs&&... args)
35 {
36 const optional<T> orig(std::forward<InitArgs>(args)...);
37 optional<T> rhs(orig);
38 bool rhs_engaged = static_cast<bool>(rhs);
39 optional<T> lhs = std::move(rhs);
40 assert(static_cast<bool>(lhs) == rhs_engaged);
41 if (rhs_engaged)
42 assert(*lhs == *orig);
43 }
44
45 template <class T, class ...InitArgs>
constexpr_test(InitArgs &&...args)46 constexpr bool constexpr_test(InitArgs&&... args)
47 {
48 static_assert( std::is_trivially_copy_constructible_v<T>, ""); // requirement
49 const optional<T> orig(std::forward<InitArgs>(args)...);
50 optional<T> rhs(orig);
51 optional<T> lhs = std::move(rhs);
52 return (lhs.has_value() == orig.has_value()) &&
53 (lhs.has_value() ? *lhs == *orig : true);
54 }
55
test_throwing_ctor()56 void test_throwing_ctor() {
57 #ifndef TEST_HAS_NO_EXCEPTIONS
58 struct Z {
59 Z() : count(0) {}
60 Z(Z&& o) : count(o.count + 1)
61 { if (count == 2) throw 6; }
62 int count;
63 };
64 Z z;
65 optional<Z> rhs(std::move(z));
66 try
67 {
68 optional<Z> lhs(std::move(rhs));
69 assert(false);
70 }
71 catch (int i)
72 {
73 assert(i == 6);
74 }
75 #endif
76 }
77
78
79 template <class T, class ...InitArgs>
test_ref(InitArgs &&...args)80 void test_ref(InitArgs&&... args)
81 {
82 optional<T> rhs(std::forward<InitArgs>(args)...);
83 bool rhs_engaged = static_cast<bool>(rhs);
84 optional<T> lhs = std::move(rhs);
85 assert(static_cast<bool>(lhs) == rhs_engaged);
86 if (rhs_engaged)
87 assert(&(*lhs) == &(*rhs));
88 }
89
test_reference_extension()90 void test_reference_extension()
91 {
92 #if defined(_LIBCPP_VERSION) && 0 // FIXME these extensions are currently disabled.
93 using T = TestTypes::TestType;
94 T::reset();
95 {
96 T t;
97 T::reset_constructors();
98 test_ref<T&>();
99 test_ref<T&>(t);
100 assert(T::alive == 1);
101 assert(T::constructed == 0);
102 assert(T::assigned == 0);
103 assert(T::destroyed == 0);
104 }
105 assert(T::destroyed == 1);
106 assert(T::alive == 0);
107 {
108 T t;
109 const T& ct = t;
110 T::reset_constructors();
111 test_ref<T const&>();
112 test_ref<T const&>(t);
113 test_ref<T const&>(ct);
114 assert(T::alive == 1);
115 assert(T::constructed == 0);
116 assert(T::assigned == 0);
117 assert(T::destroyed == 0);
118 }
119 assert(T::alive == 0);
120 assert(T::destroyed == 1);
121 {
122 T t;
123 T::reset_constructors();
124 test_ref<T&&>();
125 test_ref<T&&>(std::move(t));
126 assert(T::alive == 1);
127 assert(T::constructed == 0);
128 assert(T::assigned == 0);
129 assert(T::destroyed == 0);
130 }
131 assert(T::alive == 0);
132 assert(T::destroyed == 1);
133 {
134 T t;
135 const T& ct = t;
136 T::reset_constructors();
137 test_ref<T const&&>();
138 test_ref<T const&&>(std::move(t));
139 test_ref<T const&&>(std::move(ct));
140 assert(T::alive == 1);
141 assert(T::constructed == 0);
142 assert(T::assigned == 0);
143 assert(T::destroyed == 0);
144 }
145 assert(T::alive == 0);
146 assert(T::destroyed == 1);
147 {
148 static_assert(!std::is_copy_constructible<std::optional<T&&>>::value, "");
149 static_assert(!std::is_copy_constructible<std::optional<T const&&>>::value, "");
150 }
151 #endif
152 }
153
154
main()155 int main()
156 {
157 test<int>();
158 test<int>(3);
159 static_assert(constexpr_test<int>(), "" );
160 static_assert(constexpr_test<int>(3), "" );
161
162 {
163 optional<const int> o(42);
164 optional<const int> o2(std::move(o));
165 assert(*o2 == 42);
166 }
167 {
168 using T = TestTypes::TestType;
169 T::reset();
170 optional<T> rhs;
171 assert(T::alive == 0);
172 const optional<T> lhs(std::move(rhs));
173 assert(lhs.has_value() == false);
174 assert(rhs.has_value() == false);
175 assert(T::alive == 0);
176 }
177 TestTypes::TestType::reset();
178 {
179 using T = TestTypes::TestType;
180 T::reset();
181 optional<T> rhs(42);
182 assert(T::alive == 1);
183 assert(T::value_constructed == 1);
184 assert(T::move_constructed == 0);
185 const optional<T> lhs(std::move(rhs));
186 assert(lhs.has_value());
187 assert(rhs.has_value());
188 assert(lhs.value().value == 42);
189 assert(rhs.value().value == -1);
190 assert(T::move_constructed == 1);
191 assert(T::alive == 2);
192 }
193 TestTypes::TestType::reset();
194 {
195 using namespace ConstexprTestTypes;
196 test<TestType>();
197 test<TestType>(42);
198 }
199 {
200 using namespace TrivialTestTypes;
201 test<TestType>();
202 test<TestType>(42);
203 }
204 {
205 test_throwing_ctor();
206 }
207 {
208 struct ThrowsMove {
209 ThrowsMove() noexcept(false) {}
210 ThrowsMove(ThrowsMove const&) noexcept(false) {}
211 ThrowsMove(ThrowsMove &&) noexcept(false) {}
212 };
213 static_assert(!std::is_nothrow_move_constructible<optional<ThrowsMove>>::value, "");
214 struct NoThrowMove {
215 NoThrowMove() noexcept(false) {}
216 NoThrowMove(NoThrowMove const&) noexcept(false) {}
217 NoThrowMove(NoThrowMove &&) noexcept(true) {}
218 };
219 static_assert(std::is_nothrow_move_constructible<optional<NoThrowMove>>::value, "");
220 }
221 {
222 test_reference_extension();
223 }
224 {
225 constexpr std::optional<int> o1{4};
226 constexpr std::optional<int> o2 = std::move(o1);
227 static_assert( *o2 == 4, "" );
228 }
229 }
230