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99dee823 | 1 | // Copyright (C) 2019-2021 Free Software Foundation, Inc. |
10f26de9 JW |
2 | // |
3 | // This file is part of the GNU ISO C++ Library. This library is free | |
4 | // software; you can redistribute it and/or modify it under the | |
5 | // terms of the GNU General Public License as published by the | |
6 | // Free Software Foundation; either version 3, or (at your option) | |
7 | // any later version. | |
8 | ||
9 | // This library is distributed in the hope that it will be useful, | |
10 | // but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | // GNU General Public License for more details. | |
13 | ||
14 | // You should have received a copy of the GNU General Public License along | |
15 | // with this library; see the file COPYING3. If not see | |
16 | // <http://www.gnu.org/licenses/>. | |
17 | ||
10f26de9 JW |
18 | // { dg-do run { target c++17 } } |
19 | ||
20 | #include <variant> | |
21 | #include <vector> | |
22 | #include <string> | |
23 | #include <memory_resource> | |
24 | #include <memory> | |
25 | #include <functional> | |
26 | #include <any> | |
aa6d2be1 | 27 | #include <optional> |
10f26de9 JW |
28 | #include <testsuite_hooks.h> |
29 | ||
30 | void | |
31 | test01() | |
32 | { | |
33 | #if _GLIBCXX_USE_CXX11_ABI | |
34 | std::variant<int, std::pmr::string, std::pmr::vector<int>> v(1); | |
35 | VERIFY( v.index() == 0 ); | |
36 | ||
37 | try | |
38 | { | |
39 | std::pmr::string s = "how long is a piece of SSO string?"; | |
40 | v.emplace<1>(s, std::pmr::null_memory_resource()); | |
41 | VERIFY( false ); | |
42 | } | |
43 | catch(const std::bad_alloc&) | |
44 | { | |
45 | VERIFY( v.valueless_by_exception() ); | |
46 | } | |
47 | ||
48 | v.emplace<0>(2); | |
49 | VERIFY( v.index() == 0 ); | |
50 | ||
51 | try | |
52 | { | |
53 | v.emplace<2>({1, 2, 3}, std::pmr::null_memory_resource()); | |
54 | VERIFY( false ); | |
55 | } | |
56 | catch(const std::bad_alloc&) | |
57 | { | |
58 | VERIFY( v.valueless_by_exception() ); | |
59 | } | |
60 | #endif | |
61 | } | |
62 | ||
63 | void | |
64 | test02() | |
65 | { | |
66 | struct X | |
67 | { | |
68 | X(int i) : i(1) { if (i > 2) throw 3; } | |
69 | X(std::initializer_list<int> l) : i(2) { if (l.size() > 2) throw 3; } | |
70 | int i; | |
71 | }; | |
72 | static_assert( std::is_trivially_copyable_v<X> ); | |
73 | ||
74 | std::variant<std::monostate, int, X> v(111); | |
75 | VERIFY( v.index() == 1 ); | |
76 | ||
77 | try | |
78 | { | |
79 | v.emplace<X>(3); | |
80 | VERIFY( false ); | |
81 | } | |
82 | catch(int) | |
83 | { | |
84 | VERIFY( !v.valueless_by_exception() ); | |
85 | VERIFY( v.index() == 1 ); | |
86 | VERIFY( std::get<int>(v) == 111 ); | |
87 | } | |
88 | ||
89 | v.emplace<X>(1); | |
90 | VERIFY( v.index() == 2 ); | |
91 | VERIFY( std::get<X>(v).i == 1 ); | |
92 | ||
93 | try | |
94 | { | |
95 | v.emplace<X>(3); | |
96 | VERIFY( false ); | |
97 | } | |
98 | catch(int) | |
99 | { | |
100 | VERIFY( !v.valueless_by_exception() ); | |
101 | VERIFY( v.index() == 2 ); | |
102 | VERIFY( std::get<X>(v).i == 1 ); | |
103 | } | |
104 | ||
105 | try | |
106 | { | |
107 | v.emplace<X>({1, 2, 3}); | |
108 | VERIFY( false ); | |
109 | } | |
110 | catch(int) | |
111 | { | |
112 | VERIFY( !v.valueless_by_exception() ); | |
113 | VERIFY( v.index() == 2 ); | |
114 | VERIFY( std::get<X>(v).i == 1 ); | |
115 | } | |
116 | } | |
117 | ||
118 | template<typename T, typename V> | |
119 | bool bad_emplace(V& v) | |
120 | { | |
121 | struct X { | |
122 | operator T() const { throw 1; } | |
123 | }; | |
124 | ||
125 | const auto index = v.index(); | |
126 | ||
127 | try | |
128 | { | |
129 | if (std::is_same_v<T, std::any>) | |
130 | { | |
131 | // Need to test std::any differently, because emplace<std::any>(X{}) | |
132 | // would create a std::any with a contained X, instead of using | |
133 | // X::operator any() to convert to std::any. | |
134 | struct ThrowOnCopy { | |
135 | ThrowOnCopy() { } | |
136 | ThrowOnCopy(const ThrowOnCopy&) { throw 1; } | |
137 | } t; | |
138 | v.template emplace<std::any>(t); | |
139 | } | |
140 | else | |
141 | v.template emplace<T>(X{}); | |
142 | } | |
143 | catch (int) | |
144 | { | |
145 | return v.index() == index; | |
146 | } | |
147 | return false; | |
148 | } | |
149 | ||
150 | void | |
151 | test03() | |
152 | { | |
153 | struct TriviallyCopyable { int i = 0; }; | |
154 | ||
155 | std::variant<std::monostate, int, TriviallyCopyable, std::optional<int>, | |
156 | std::string, std::vector<int>, std::function<void()>, std::any, | |
157 | std::shared_ptr<int>, std::weak_ptr<int>, std::unique_ptr<int>> v(1); | |
158 | VERIFY( v.index() == 1 ); | |
159 | ||
160 | VERIFY( bad_emplace<int>(v) ); | |
161 | VERIFY( bad_emplace<TriviallyCopyable>(v) ); | |
162 | VERIFY( bad_emplace<std::optional<int>>(v) ); | |
163 | VERIFY( bad_emplace<std::string>(v) ); | |
164 | VERIFY( bad_emplace<std::vector<int>>(v) ); | |
165 | VERIFY( bad_emplace<std::function<void()>>(v) ); | |
166 | VERIFY( bad_emplace<std::any>(v) ); | |
167 | VERIFY( bad_emplace<std::shared_ptr<int>>(v) ); | |
168 | VERIFY( bad_emplace<std::weak_ptr<int>>(v) ); | |
169 | VERIFY( bad_emplace<std::unique_ptr<int>>(v) ); | |
170 | } | |
171 | ||
86a57ce1 JW |
172 | void |
173 | test04() | |
174 | { | |
175 | // LWG 2904. Make variant move-assignment more exception safe | |
176 | ||
177 | struct ThrowOnCopy | |
178 | { | |
179 | ThrowOnCopy() { } | |
180 | ThrowOnCopy(const ThrowOnCopy&) { throw 1; } | |
181 | ThrowOnCopy& operator=(const ThrowOnCopy&) { throw "shouldn't happen"; } | |
182 | ThrowOnCopy(ThrowOnCopy&&) noexcept { } | |
183 | }; | |
184 | ||
185 | std::variant<int, ThrowOnCopy> v1(std::in_place_type<ThrowOnCopy>), v2(2); | |
186 | try | |
187 | { | |
188 | v2 = v1; // uses variant<Types...>::operator=(const variant&) | |
189 | VERIFY( false ); | |
190 | } | |
191 | catch (int) | |
192 | { | |
193 | VERIFY( !v2.valueless_by_exception() ); | |
194 | VERIFY( v2.index() == 0 ); | |
195 | VERIFY( std::get<0>(v2) == 2 ); | |
196 | } | |
197 | ||
198 | try | |
199 | { | |
200 | ThrowOnCopy toc; | |
201 | v2 = toc; // uses variant<Types...>::operator=(T&&) | |
202 | VERIFY( false ); | |
203 | } | |
204 | catch (int) | |
205 | { | |
206 | VERIFY( !v2.valueless_by_exception() ); | |
207 | VERIFY( v2.index() == 0 ); | |
208 | VERIFY( std::get<0>(v2) == 2 ); | |
209 | } | |
210 | } | |
211 | ||
10f26de9 JW |
212 | int |
213 | main() | |
214 | { | |
215 | test01(); | |
216 | test02(); | |
217 | test03(); | |
86a57ce1 | 218 | test04(); |
10f26de9 | 219 | } |