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1 | // -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- |
2 | // vim: ts=8 sw=2 smarttab | |
3 | /* | |
4 | * Ceph - scalable distributed file system | |
5 | * | |
6 | * Copyright (C) 2016 Red Hat | |
7 | * | |
8 | * This is free software; you can redistribute it and/or | |
9 | * modify it under the terms of the GNU Lesser General Public | |
10 | * License version 2.1, as published by the Free Software | |
11 | * Foundation. See file COPYING. | |
12 | * | |
13 | */ | |
14 | ||
15 | #ifndef SCOPE_GUARD | |
16 | #define SCOPE_GUARD | |
17 | ||
224ce89b WB |
18 | #include <utility> |
19 | ||
7c673cae FG |
20 | template <typename F> |
21 | struct scope_guard { | |
22 | F f; | |
23 | scope_guard() = delete; | |
24 | scope_guard(const scope_guard &) = delete; | |
25 | scope_guard(scope_guard &&) = default; | |
26 | scope_guard & operator=(const scope_guard &) = delete; | |
27 | scope_guard & operator=(scope_guard &&) = default; | |
11fdf7f2 | 28 | scope_guard(const F& f) : f(f) {} |
7c673cae | 29 | scope_guard(F &&f) : f(std::move(f)) {} |
11fdf7f2 TL |
30 | template<typename... Args> |
31 | scope_guard(std::in_place_t, Args&& ...args) : f(std::forward<Args>(args)...) {} | |
7c673cae | 32 | ~scope_guard() { |
11fdf7f2 | 33 | std::move(f)(); // Support at-most-once functions |
7c673cae FG |
34 | } |
35 | }; | |
36 | ||
37 | template <typename F> | |
38 | scope_guard<F> make_scope_guard(F &&f) { | |
39 | return scope_guard<F>(std::forward<F>(f)); | |
40 | } | |
41 | ||
11fdf7f2 TL |
42 | template<typename F, typename... Args> |
43 | scope_guard<F> make_scope_guard(std::in_place_type_t<F>, Args&& ...args) { | |
44 | return { std::in_place, std::forward<Args>(args)... }; | |
45 | } | |
46 | ||
7c673cae | 47 | #endif |