Created
July 23, 2016 21:36
-
-
Save victorMoneratto/8ed0d9d9ddac8f38acdcb754fc04ed11 to your computer and use it in GitHub Desktop.
C++11 defer scope implementation
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| // defer.h | |
| // | |
| // Copyright (c) 2016 Victor Moneratto | |
| // | |
| // Permission is hereby granted, free of charge, to any person obtaining a copy of this software | |
| // and associated documentation files (the "Software"), to deal in the Software without restriction, | |
| // including without limitation the rights to use, copy, modify, merge, publish, distribute, | |
| // sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is | |
| // furnished to do so, subject to the following conditions: | |
| // | |
| // The above copyright notice and this permission notice shall be included in all copies or substantial | |
| // portions of the Software. | |
| // | |
| // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT | |
| // NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. | |
| // IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, | |
| // WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE | |
| // SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. | |
| #pragma once | |
| template <typename Func> | |
| struct ScopeExit { | |
| Func f; | |
| ScopeExit(const Func& f) : f(f) {} | |
| ~ScopeExit() { f(); } | |
| }; | |
| struct ScopeExitHelper { | |
| template <typename Func> | |
| ScopeExit<Func> operator+(Func func) { return func; } | |
| }; | |
| #define CONCAT_INTERNAL(x,y) x##y | |
| #define CONCAT(x,y) CONCAT_INTERNAL(x,y) | |
| #define defer const auto& CONCAT(scope_exit_, __LINE__) = ScopeExitHelper() + [&]() | |
| // Usage: | |
| // int* mem = (int*) malloc(sizeof(int) * 1024); | |
| // defer { free(mem); }; |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment