1 | /** |
2 | * Copyright 2021 Alibaba, Inc. and its affiliates. All Rights Reserved. |
3 | * |
4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
5 | * you may not use this file except in compliance with the License. |
6 | * You may obtain a copy of the License at |
7 | * |
8 | * http://www.apache.org/licenses/LICENSE-2.0 |
9 | * |
10 | * Unless required by applicable law or agreed to in writing, software |
11 | * distributed under the License is distributed on an "AS IS" BASIS, |
12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
13 | * See the License for the specific language governing permissions and |
14 | * limitations under the License. |
15 | |
16 | * \author Haichao.chc |
17 | * \date Nov 2020 |
18 | * \brief Scope guard like golang defer |
19 | */ |
20 | |
21 | #pragma once |
22 | |
23 | #include <functional> |
24 | #include <vector> |
25 | |
26 | namespace proxima { |
27 | namespace be { |
28 | |
29 | /* |
30 | * RAII style scope guard to ensure release resource |
31 | */ |
32 | class Defer { |
33 | public: |
34 | using Func = std::function<void(void)>; |
35 | |
36 | Defer() = default; |
37 | |
38 | Defer(Func f) { |
39 | funcs_.emplace_back(f); |
40 | } |
41 | |
42 | Defer(const Defer &) = delete; |
43 | |
44 | Defer &operator=(const Defer &) = delete; |
45 | |
46 | ~Defer() { |
47 | for (auto func : funcs_) { |
48 | func(); |
49 | } |
50 | |
51 | funcs_.clear(); |
52 | } |
53 | |
54 | public: |
55 | void operator()(Func f) { |
56 | funcs_.emplace_back(f); |
57 | } |
58 | |
59 | private: |
60 | std::vector<Func> funcs_; |
61 | }; |
62 | |
63 | } // namespace be |
64 | } // end namespace proxima |
65 | |