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1 // Copyright (c) 2011 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2011 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #ifndef BASE_AUTO_RESET_H_ | 5 #ifndef BASE_AUTO_RESET_H_ |
6 #define BASE_AUTO_RESET_H_ | 6 #define BASE_AUTO_RESET_H_ |
7 | 7 |
8 #include "base/basictypes.h" | 8 #include "base/macros.h" |
9 | 9 |
10 // base::AutoReset<> is useful for setting a variable to a new value only within | 10 // base::AutoReset<> is useful for setting a variable to a new value only within |
11 // a particular scope. An base::AutoReset<> object resets a variable to its | 11 // a particular scope. An base::AutoReset<> object resets a variable to its |
12 // original value upon destruction, making it an alternative to writing | 12 // original value upon destruction, making it an alternative to writing |
13 // "var = false;" or "var = old_val;" at all of a block's exit points. | 13 // "var = false;" or "var = old_val;" at all of a block's exit points. |
14 // | 14 // |
15 // This should be obvious, but note that an base::AutoReset<> instance should | 15 // This should be obvious, but note that an base::AutoReset<> instance should |
16 // have a shorter lifetime than its scoped_variable, to prevent invalid memory | 16 // have a shorter lifetime than its scoped_variable, to prevent invalid memory |
17 // writes when the base::AutoReset<> object is destroyed. | 17 // writes when the base::AutoReset<> object is destroyed. |
18 | 18 |
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32 private: | 32 private: |
33 T* scoped_variable_; | 33 T* scoped_variable_; |
34 T original_value_; | 34 T original_value_; |
35 | 35 |
36 DISALLOW_COPY_AND_ASSIGN(AutoReset); | 36 DISALLOW_COPY_AND_ASSIGN(AutoReset); |
37 }; | 37 }; |
38 | 38 |
39 } // namespace base | 39 } // namespace base |
40 | 40 |
41 #endif // BASE_AUTO_RESET_H_ | 41 #endif // BASE_AUTO_RESET_H_ |
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