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7adcbafe | 1 | // Copyright (C) 2019-2022 Free Software Foundation, Inc. |
7fb65a87 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 | ||
18 | // { dg-do run { target c++11 } } | |
19 | ||
20 | #include <memory> | |
21 | ||
22 | template<typename Func, typename Arg, typename = void> | |
23 | struct is_callable | |
24 | : std::false_type | |
25 | { }; | |
26 | ||
27 | template<typename Func, typename Arg> | |
28 | struct is_callable<Func, Arg, | |
29 | decltype((void)(std::declval<Func&>()(std::declval<Arg>())))> | |
30 | : std::true_type | |
31 | { }; | |
32 | ||
33 | void | |
34 | test01() | |
35 | { | |
36 | struct D { | |
37 | struct pointer { }; | |
38 | void operator()(pointer) const noexcept { } | |
39 | }; | |
40 | static_assert( !is_callable<std::hash<D::pointer>&, D::pointer>::value ); | |
41 | ||
42 | using UP = std::unique_ptr<int, D>; | |
43 | // [unord.hash] | |
44 | // Disabled specializations of hash are not function object types | |
45 | static_assert( !is_callable<std::hash<UP>&, UP>::value ); | |
46 | static_assert( !is_callable<std::hash<UP>&, UP&>::value ); | |
47 | static_assert( !is_callable<std::hash<UP>&, const UP&>::value ); | |
48 | } | |
49 | ||
50 | struct D { | |
51 | struct pointer { }; | |
52 | void operator()(pointer) const noexcept { } | |
53 | }; | |
54 | ||
55 | bool operator==(D::pointer, std::nullptr_t) { return false; } | |
56 | bool operator!=(D::pointer, std::nullptr_t) { return true; } | |
57 | ||
58 | namespace std { | |
59 | template<> struct hash<D::pointer> { | |
60 | size_t operator()(D::pointer) const { throw 1; } | |
61 | }; | |
62 | } | |
63 | ||
64 | void | |
65 | test02() | |
66 | { | |
67 | using UP = std::unique_ptr<int, D>; | |
68 | UP p; | |
69 | std::hash<UP> h; | |
70 | try { | |
71 | // [util.smartptr.hash] | |
72 | // The member functions are not guaranteed to be noexcept. | |
73 | h(p); | |
74 | throw "should not reach here"; | |
75 | } catch (int) { | |
76 | // Should catch exception here, rather than terminating. | |
77 | } | |
78 | ||
79 | // Should still be noexcept if the underlying hash object is: | |
80 | using UP2 = std::unique_ptr<int>; | |
81 | UP2 p2; | |
82 | std::hash<UP2> h2; | |
83 | static_assert( noexcept(h2(p2)), "operator() is noexcept" ); | |
84 | } | |
85 | ||
86 | int | |
87 | main() | |
88 | { | |
89 | test02(); | |
90 | } |