1 /*
2  * Copyright (c) 2021 Huawei Device Co., Ltd.
3  * Licensed under the Apache License, Version 2.0 (the "License");
4  * you may not use this file except in compliance with the License.
5  * You may obtain a copy of the License at
6  *
7  *     http://www.apache.org/licenses/LICENSE-2.0
8  *
9  * Unless required by applicable law or agreed to in writing, software
10  * distributed under the License is distributed on an "AS IS" BASIS,
11  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12  * See the License for the specific language governing permissions and
13  * limitations under the License.
14  */
15 
16 #ifndef RES_FINALIZER_H
17 #define RES_FINALIZER_H
18 
19 #include <functional>
20 #include "macro_utils.h"
21 
22 namespace DistributedDB {
23 // RAII style resource finalizer for using in functions where the resource should be finalized before each return after
24 // the resource had been allocated. Just create an instance as function local stack variable and provide finalizer
25 // function after where the resource allocated. Suggest using this RAII style instead of using goto statement.
26 class ResFinalizer {
27 public:
ResFinalizer(const std::function<void (void)> & inFinalizer)28     explicit ResFinalizer(const std::function<void(void)> &inFinalizer) : finalizer_(inFinalizer) {}
~ResFinalizer()29     ~ResFinalizer()
30     {
31         if (finalizer_) {
32             finalizer_();
33         }
34     }
35 
36     DISABLE_COPY_ASSIGN_MOVE(ResFinalizer);
37 private:
38     std::function<void(void)> finalizer_;
39 };
40 } // namespace DistributedDB
41 #endif // RES_FINALIZER_H