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8d9254fc | 1 | // Copyright (C) 2019-2020 Free Software Foundation, Inc. |
da8ddcec 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++2a" } | |
19 | // { dg-do compile { target c++2a } } | |
20 | ||
21 | #include <functional> | |
22 | ||
23 | // C++20 [func.identity] | |
24 | static_assert( std::is_default_constructible_v<std::identity> ); | |
25 | static_assert( std::is_copy_constructible_v<std::identity> ); | |
26 | static_assert( std::is_move_constructible_v<std::identity> ); | |
27 | static_assert( std::is_copy_assignable_v<std::identity> ); | |
28 | static_assert( std::is_move_assignable_v<std::identity> ); | |
29 | ||
30 | static_assert( !std::is_invocable_v<std::identity> ); | |
31 | static_assert( !std::is_invocable_v<std::identity, int&, int&> ); | |
32 | static_assert( std::is_nothrow_invocable_r_v<int&, std::identity&, int&> ); | |
33 | static_assert( std::is_nothrow_invocable_r_v<const long&, std::identity, const long&> ); | |
34 | static_assert( std::is_nothrow_invocable_r_v<short&&, const std::identity&, short> ); | |
35 | static_assert( std::is_nothrow_invocable_r_v<const char&&, const std::identity, const char> ); | |
36 | ||
37 | int i; | |
38 | static_assert( std::addressof(std::identity{}(i)) == std::addressof(i) ); | |
39 | ||
40 | using T = std::identity::is_transparent; // required typedef |