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52066eae | 1 | // { dg-do run { target c++11 } } |
7cc9022f | 2 | // { dg-require-effective-target hosted } |
8dd5e93a | 3 | |
a945c346 | 4 | // Copyright (C) 2008-2024 Free Software Foundation, Inc. |
8dd5e93a JW |
5 | // |
6 | // This file is part of the GNU ISO C++ Library. This library is free | |
7 | // software; you can redistribute it and/or modify it under the | |
8 | // terms of the GNU General Public License as published by the | |
748086b7 | 9 | // Free Software Foundation; either version 3, or (at your option) |
8dd5e93a JW |
10 | // any later version. |
11 | ||
12 | // This library is distributed in the hope that it will be useful, | |
13 | // but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | // GNU General Public License for more details. | |
16 | ||
17 | // You should have received a copy of the GNU General Public License along | |
748086b7 JJ |
18 | // with this library; see the file COPYING3. If not see |
19 | // <http://www.gnu.org/licenses/>. | |
8dd5e93a JW |
20 | |
21 | // 20.8.13.2 Template class shared_ptr [util.smartptr.shared] | |
22 | ||
23 | #include <memory> | |
24 | #include <testsuite_hooks.h> | |
25 | ||
26 | struct A { }; | |
27 | ||
28 | namespace std | |
29 | { | |
30 | template<> | |
de196e5d | 31 | struct less<A*> |
8dd5e93a JW |
32 | { |
33 | static int count; | |
34 | bool operator()(A* l, A* r) { ++count; return l < r; } | |
35 | }; | |
36 | int less<A*>::count = 0; | |
37 | } | |
38 | ||
39 | // 20.8.13.2.7 shared_ptr comparison [util.smartptr.shared.cmp] | |
40 | ||
41 | ||
42 | int | |
43 | test01() | |
44 | { | |
45 | std::less<std::shared_ptr<A>> less; | |
46 | // test empty shared_ptrs compare equivalent | |
47 | std::shared_ptr<A> p1; | |
48 | std::shared_ptr<A> p2; | |
49 | VERIFY( !less(p1, p2) && !less(p2, p1) ); | |
f5fa62ed JW |
50 | #ifndef __cpp_lib_three_way_comparison |
51 | // In C++20 std::less<std::shared_ptr<A>> uses the operator< synthesized | |
52 | // from operator<=>, which uses std::compare_three_way not std::less<A*>. | |
8dd5e93a | 53 | VERIFY( std::less<A*>::count == 2 ); |
f5fa62ed | 54 | #endif |
8dd5e93a JW |
55 | return 0; |
56 | } | |
57 | ||
58 | ||
59 | // Construction from pointer | |
60 | int | |
61 | test02() | |
62 | { | |
63 | std::less<std::shared_ptr<A>> less; | |
64 | ||
65 | std::shared_ptr<A> empty; | |
66 | std::shared_ptr<A> p1(new A); | |
67 | std::shared_ptr<A> p2(new A); | |
68 | ||
69 | VERIFY( less(p1, p2) || less(p2, p1) ); | |
70 | VERIFY( !(less(p1, p2) && less(p2, p1)) ); | |
71 | ||
72 | p1.reset(); | |
73 | VERIFY( !less(p1, empty) && !less(empty, p1) ); | |
74 | ||
75 | p2.reset(); | |
76 | VERIFY( !less(p1, p2) && !less(p2, p1) ); | |
77 | ||
78 | return 0; | |
79 | } | |
80 | ||
81 | // Aliasing | |
82 | int | |
83 | test03() | |
84 | { | |
85 | std::less<std::shared_ptr<A>> less; | |
86 | ||
87 | A a; | |
88 | std::shared_ptr<A> p1(new A); | |
89 | std::shared_ptr<A> p2(p1, &a); | |
90 | VERIFY( less(p1, p2) || less(p2, p1) ); | |
91 | ||
92 | return 0; | |
93 | } | |
f5fa62ed | 94 | int |
8dd5e93a JW |
95 | main() |
96 | { | |
97 | test01(); | |
98 | test02(); | |
99 | test03(); | |
100 | return 0; | |
101 | } |