| // Copyright 2019 The Marl Authors. |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // https://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| #ifndef marl_defer_h |
| #define marl_defer_h |
| |
| #include "finally.h" |
| |
| namespace marl { |
| |
| #define MARL_CONCAT_(a, b) a##b |
| #define MARL_CONCAT(a, b) MARL_CONCAT_(a, b) |
| |
| // defer() is a macro to defer execution of a statement until the surrounding |
| // scope is closed and is typically used to perform cleanup logic once a |
| // function returns. |
| // |
| // Note: Unlike golang's defer(), the defer statement is executed when the |
| // surrounding *scope* is closed, not necessarily the function. |
| // |
| // Example usage: |
| // |
| // void sayHelloWorld() |
| // { |
| // defer(printf("world\n")); |
| // printf("hello "); |
| // } |
| // |
| #define defer(x) \ |
| auto MARL_CONCAT(defer_, __LINE__) = marl::make_finally([&] { x; }) |
| |
| } // namespace marl |
| |
| #endif // marl_defer_h |
