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99dee823 | 1 | // Copyright (C) 2020-2021 Free Software Foundation, Inc. |
b3341826 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" } | |
19 | // { dg-do compile { target c++17 } } | |
20 | ||
21 | #include <optional> | |
22 | #include <tuple> | |
23 | ||
24 | template <bool B> struct abc {}; | |
25 | ||
26 | template <typename T> | |
27 | ||
28 | struct future : public abc<std::is_trivially_constructible_v<std::tuple<T>>> {}; | |
29 | ||
30 | class mutation { | |
31 | mutation(); | |
32 | friend class std::optional<mutation>; | |
33 | }; | |
34 | ||
35 | using mutation_opt = std::optional<mutation>; | |
36 | ||
37 | future<mutation_opt> foo(); | |
38 | ||
39 | template <typename Consumer> future<mutation_opt> consume_partitions() { | |
40 | return foo(); | |
41 | } | |
42 | ||
43 | future<mutation_opt> bar() { return consume_partitions<int>(); } | |
44 | ||
45 | future<mutation> zed(); | |
46 | future<mutation> apply_counter_update() { return zed(); } |