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Side by Side Diff: base/auto_reset.h

Issue 1647803004: Move base to DEPS (Closed) Base URL: git@github.com:domokit/mojo.git@master
Patch Set: Created 4 years, 10 months ago
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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
3 // found in the LICENSE file.
4
5 #ifndef BASE_AUTO_RESET_H_
6 #define BASE_AUTO_RESET_H_
7
8 #include "base/basictypes.h"
9
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
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.
14 //
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
17 // writes when the base::AutoReset<> object is destroyed.
18
19 namespace base {
20
21 template<typename T>
22 class AutoReset {
23 public:
24 AutoReset(T* scoped_variable, T new_value)
25 : scoped_variable_(scoped_variable),
26 original_value_(*scoped_variable) {
27 *scoped_variable_ = new_value;
28 }
29
30 ~AutoReset() { *scoped_variable_ = original_value_; }
31
32 private:
33 T* scoped_variable_;
34 T original_value_;
35
36 DISALLOW_COPY_AND_ASSIGN(AutoReset);
37 };
38
39 } // namespace base
40
41 #endif // BASE_AUTO_RESET_H_
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