| // Copyright (c) 2009 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #ifndef BASE_AUTO_RESET_H_ |
| #define BASE_AUTO_RESET_H_ |
| |
| #include "base/basictypes.h" |
| |
| // AutoReset is useful for setting a variable to some value only during a |
| // particular scope. If you have code that has to add "var = false;" or |
| // "var = old_var;" at all the exit points of a block, for example, you would |
| // benefit from using this instead. |
| // |
| // NOTE: Right now this is hardcoded to work on bools, since that covers all the |
| // cases where we've used it. It would be reasonable to turn it into a template |
| // class in the future. |
| |
| class AutoReset { |
| public: |
| explicit AutoReset(bool* scoped_variable, bool new_value) |
| : scoped_variable_(scoped_variable), |
| original_value_(*scoped_variable) { |
| *scoped_variable_ = new_value; |
| } |
| ~AutoReset() { *scoped_variable_ = original_value_; } |
| |
| private: |
| bool* scoped_variable_; |
| bool original_value_; |
| |
| DISALLOW_COPY_AND_ASSIGN(AutoReset); |
| }; |
| |
| #endif // BASE_AUTO_RESET_H_ |