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1 | // Copyright (C) 2017-2024 Free Software Foundation, Inc. | |
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 compile { target c++17_only } } | |
19 | ||
20 | #include <functional> | |
21 | ||
22 | // PR libstdc++/83427 | |
23 | ||
24 | int f(short) noexcept { return 0; } | |
25 | std::reference_wrapper<decltype(f)> r(f); | |
26 | static_assert(std::is_same_v<decltype(r)::result_type, int>); | |
27 | static_assert(std::is_same_v<decltype(r)::argument_type, short>); | |
28 | ||
29 | auto* p = &f; | |
30 | std::reference_wrapper<decltype(&f)> r2(p); | |
31 | static_assert(std::is_same_v<decltype(r2)::result_type, int>); | |
32 | static_assert(std::is_same_v<decltype(r2)::argument_type, short>); | |
33 | ||
34 | struct X { long f() const & noexcept { return 0L; } }; | |
35 | auto m = &X::f; | |
36 | std::reference_wrapper<decltype(m)> r3(m); | |
37 | static_assert(std::is_same_v<decltype(r3)::result_type, long>); | |
38 | static_assert(std::is_same_v<decltype(r3)::argument_type, const X*>); |