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99dee823 | 1 | // Copyright (C) 2016-2021 Free Software Foundation, Inc. |
d81102f4 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 | ||
52066eae | 18 | // { dg-do run { target c++14 } } |
d81102f4 JW |
19 | |
20 | #include <vector> | |
21 | #include <memory> | |
22 | #include <testsuite_hooks.h> | |
23 | ||
24 | // See https://gcc.gnu.org/ml/libstdc++/2016-07/msg00008.html for background. | |
25 | ||
26 | struct T | |
27 | { | |
28 | T(int v = 0) : value(v) { } | |
29 | T(const T& t); | |
30 | T& operator=(const T& t); | |
31 | void make_child() { child = std::make_unique<T>(value + 10); } | |
32 | std::unique_ptr<T> child; | |
33 | int value; | |
34 | }; | |
35 | ||
36 | T::T(const T& t) : value(t.value) | |
37 | { | |
38 | if (t.child) | |
39 | child.reset(new T(*t.child)); | |
40 | } | |
41 | ||
42 | T& T::operator=(const T& t) | |
43 | { | |
44 | value = t.value; | |
45 | if (t.child) | |
46 | { | |
47 | if (child) | |
48 | *child = *t.child; | |
49 | else | |
50 | child.reset(new T(*t.child)); | |
51 | } | |
52 | else | |
53 | child.reset(); | |
54 | return *this; | |
55 | } | |
56 | ||
57 | void | |
58 | test01() | |
59 | { | |
60 | std::vector<T> v; | |
61 | v.reserve(3); | |
62 | v.push_back(T(1)); | |
63 | v.back().make_child(); | |
64 | v.push_back(T(2)); | |
65 | v.back().make_child(); | |
66 | ||
67 | VERIFY(v[1].child->value == 12); | |
68 | VERIFY(v[1].child->child == nullptr); | |
69 | ||
70 | v.insert(v.begin(), *v[1].child); | |
71 | ||
72 | VERIFY(v[0].value == 12); | |
73 | VERIFY(v[0].child == nullptr); | |
74 | } | |
75 | ||
76 | int main() | |
77 | { | |
78 | test01(); | |
79 | } |