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99dee823 | 1 | // Copyright (C) 2014-2021 Free Software Foundation, Inc. |
e6ee5bfd 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-options "-std=gnu++17" } | |
6458742a | 19 | // { dg-do run { target c++17 } } |
e6ee5bfd JW |
20 | |
21 | #include <functional> | |
22 | #include <testsuite_hooks.h> | |
23 | ||
24 | using std::not_fn; | |
25 | ||
26 | int func(int, char) { return 0; } | |
27 | ||
28 | struct F | |
29 | { | |
30 | bool operator()() { return false; } | |
31 | bool operator()() const { return true; } | |
32 | bool operator()(int) { return false; } | |
33 | }; | |
34 | ||
35 | void | |
36 | test01() | |
37 | { | |
38 | auto f1 = not_fn(func); | |
39 | VERIFY( f1(1, '2') == true ); | |
40 | ||
41 | auto f2 = not_fn( [] { return true; } ); | |
42 | VERIFY( f2() == false ); | |
43 | ||
44 | auto f3 = not_fn( F{} ); | |
45 | VERIFY( f3() == true ); | |
46 | VERIFY( f3(1) == true ); | |
47 | const auto f4 = f3; | |
48 | VERIFY( f4() == false ); | |
49 | } | |
50 | ||
51 | template<typename F, typename Arg> | |
52 | auto foo(F f, Arg arg) -> decltype(not_fn(f)(arg)) { return not_fn(f)(arg); } | |
53 | ||
54 | template<typename F, typename Arg> | |
55 | auto foo(F f, Arg arg) -> decltype(not_fn(f)()) { return not_fn(f)(); } | |
56 | ||
57 | struct negator | |
58 | { | |
59 | bool operator()(int) const { return false; } | |
60 | void operator()() const {} | |
61 | }; | |
62 | ||
63 | void | |
64 | test02() | |
65 | { | |
66 | foo(negator{}, 1); // PR libstdc++/66998 | |
67 | } | |
68 | ||
69 | void | |
70 | test03() | |
71 | { | |
72 | struct X { bool b; }; | |
73 | X x{ false }; | |
74 | VERIFY( not_fn(&X::b)(x) ); | |
75 | } | |
76 | ||
77 | void | |
78 | test04() | |
79 | { | |
80 | struct abstract { virtual void f() = 0; }; | |
81 | struct derived : abstract { void f() { } }; | |
82 | struct F { bool operator()(abstract&) { return false; } }; | |
83 | F f; | |
84 | derived d; | |
85 | VERIFY( not_fn(f)(d) ); | |
86 | } | |
87 | ||
78ec9c15 JW |
88 | void |
89 | test05() | |
90 | { | |
aaae096a JW |
91 | auto nf = std::not_fn([] { return false; }); |
92 | auto copy(nf); // PR libstdc++/70564 | |
78ec9c15 JW |
93 | } |
94 | ||
cc06c7f6 JW |
95 | void |
96 | test06() | |
97 | { | |
98 | struct Boolean { | |
99 | Boolean operator!() noexcept(false) { return *this; } | |
100 | }; | |
101 | struct F { | |
102 | Boolean operator()() { return {}; } | |
103 | }; | |
104 | F f; | |
105 | auto notf = std::not_fn(f); | |
106 | using NotF = decltype(notf); | |
7dcc645c | 107 | static_assert( std::is_invocable<NotF>::value, "cannot negate" ); |
cc06c7f6 JW |
108 | static_assert( !noexcept(notf()), "conversion to bool affects noexcept" ); |
109 | } | |
110 | ||
111 | void | |
112 | test07() | |
113 | { | |
114 | struct NonNegatable { }; | |
115 | struct F { | |
116 | NonNegatable operator()() { return {}; } | |
117 | }; | |
118 | F f; | |
119 | auto notf = std::not_fn(f); | |
120 | using NotF = decltype(notf); | |
7dcc645c | 121 | static_assert( !std::is_invocable<NotF>::value, "cannot negate" ); |
cc06c7f6 JW |
122 | } |
123 | ||
e6ee5bfd JW |
124 | int |
125 | main() | |
126 | { | |
127 | test01(); | |
128 | test02(); | |
129 | test03(); | |
130 | test04(); | |
78ec9c15 | 131 | test05(); |
cc06c7f6 JW |
132 | test06(); |
133 | test07(); | |
e6ee5bfd | 134 | } |