1 // Copyright (c) 2010 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
5 #ifndef BASE_AUTO_RESET_H_
6 #define BASE_AUTO_RESET_H_
9 #include "base/basictypes.h"
11 // AutoResetValue is useful for setting a variable to some value only
12 // during a particular scope. If you have code that has to add "var =
13 // false;" or "var = old_var;" at all the exit points of a block, for
14 // example, you would benefit from using this instead.
16 // This should be obvious, but note that the AutoResetValue instance
17 // should have a shorter lifetime than the scoped_variable, to prevent
18 // writing to invalid memory when the AutoResetValue goes out of
24 AutoReset(T
* scoped_variable
, T new_value
)
25 : scoped_variable_(scoped_variable
),
26 original_value_(*scoped_variable
) {
27 *scoped_variable_
= new_value
;
30 ~AutoReset() { *scoped_variable_
= original_value_
; }
36 DISALLOW_COPY_AND_ASSIGN(AutoReset
);
39 #endif // BASE_AUTO_RESET_H_