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a945c346 | 1 | // Copyright (C) 2019-2024 Free Software Foundation, Inc. |
2670a7aa 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 | ||
6d0b43f5 | 18 | // { dg-do compile { target c++20 } } |
2670a7aa JW |
19 | |
20 | #include <functional> | |
21 | ||
22 | struct F | |
23 | { | |
24 | int i; | |
25 | constexpr int add(int j) { return i + j; } | |
26 | }; | |
27 | ||
28 | constexpr int | |
29 | test01(int i) | |
30 | { | |
31 | F f{i}; | |
32 | return std::mem_fn(&F::i)(f); | |
33 | } | |
34 | ||
35 | static_assert( test01(2) == 2 ); | |
36 | ||
37 | constexpr int | |
38 | test02(int i, int j) | |
39 | { | |
40 | F f{i}; | |
41 | return std::mem_fn(&F::add)(&f, j); | |
42 | } | |
43 | ||
44 | static_assert( test02(3, 4) == 7 ); |