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1 | // Copyright (C) 2020 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-options "-std=gnu++2a" } | |
19 | // { dg-do compile { target c++2a } } | |
20 | ||
21 | #include <coroutine> | |
22 | ||
23 | void | |
24 | test01() | |
25 | { | |
26 | // LWG 3460. Unimplementable noop_coroutine_handle guarantees | |
27 | ||
28 | static_assert( std::is_convertible_v<std::noop_coroutine_handle&, | |
29 | std::coroutine_handle<>> ); | |
30 | static_assert( ! std::is_convertible_v<std::noop_coroutine_handle&, | |
31 | std::coroutine_handle<>&> ); | |
32 | static_assert( ! std::is_assignable_v<std::noop_coroutine_handle&, | |
33 | std::coroutine_handle<>> ); | |
34 | ||
35 | std::noop_coroutine_handle h = std::noop_coroutine(); | |
36 | std::coroutine_handle<> h2 = h; | |
37 | h2(); // no-op | |
38 | h2.resume(); // no-op | |
39 | h2.destroy(); // no-op | |
40 | } | |
41 | ||
42 | void | |
43 | test02() | |
44 | { | |
45 | // LWG 3469. Precondition of coroutine_handle::promise may be insufficient | |
46 | ||
47 | struct P1 { }; | |
48 | struct P2 { }; | |
49 | ||
50 | static_assert( ! std::is_assignable_v<std::coroutine_handle<P1>&, | |
51 | std::coroutine_handle<>> ); | |
52 | static_assert( ! std::is_assignable_v<std::coroutine_handle<P1>&, | |
53 | std::coroutine_handle<P2>> ); | |
54 | } |