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| 1 // Copyright 2013 The Chromium Authors. All rights reserved. | 1 // Copyright 2013 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 ASH_SHELF_SCOPED_OBSERVER_WITH_DUPLICATED_SOURCES_H_ | 5 #ifndef ASH_SHELF_SCOPED_OBSERVER_WITH_DUPLICATED_SOURCES_H_ |
| 6 #define ASH_SHELF_SCOPED_OBSERVER_WITH_DUPLICATED_SOURCES_H_ | 6 #define ASH_SHELF_SCOPED_OBSERVER_WITH_DUPLICATED_SOURCES_H_ |
| 7 | 7 |
| 8 #include <map> | 8 #include <map> |
| 9 | 9 |
| 10 #include "base/basictypes.h" | |
| 11 #include "base/logging.h" | 10 #include "base/logging.h" |
| 11 #include "base/macros.h" |
| 12 | 12 |
| 13 // ScopedObserverWithDuplicatedSources is used to keep track of the set of | 13 // ScopedObserverWithDuplicatedSources is used to keep track of the set of |
| 14 // sources an object has attached itself to as an observer. When | 14 // sources an object has attached itself to as an observer. When |
| 15 // ScopedObserverWithDuplicatedSources is destroyed it removes the object as an | 15 // ScopedObserverWithDuplicatedSources is destroyed it removes the object as an |
| 16 // observer from all sources it has been added to. | 16 // observer from all sources it has been added to. |
| 17 // ScopedObserverWithDuplicatedSources adds |observer| once for a particular | 17 // ScopedObserverWithDuplicatedSources adds |observer| once for a particular |
| 18 // source, no matter how many times Add() is invoked. Additionaly |observer| is | 18 // source, no matter how many times Add() is invoked. Additionaly |observer| is |
| 19 // only removed once Remove() is invoked the same number of times as Add(). | 19 // only removed once Remove() is invoked the same number of times as Add(). |
| 20 | 20 |
| 21 template <class Source, class Observer> | 21 template <class Source, class Observer> |
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| 61 | 61 |
| 62 Observer* observer_; | 62 Observer* observer_; |
| 63 | 63 |
| 64 // Map Source and its adding count. | 64 // Map Source and its adding count. |
| 65 std::map<Source*, int> counted_sources_; | 65 std::map<Source*, int> counted_sources_; |
| 66 | 66 |
| 67 DISALLOW_COPY_AND_ASSIGN(ScopedObserverWithDuplicatedSources); | 67 DISALLOW_COPY_AND_ASSIGN(ScopedObserverWithDuplicatedSources); |
| 68 }; | 68 }; |
| 69 | 69 |
| 70 #endif // ASH_SHELF_SCOPED_OBSERVER_WITH_DUPLICATED_SOURCES_H_ | 70 #endif // ASH_SHELF_SCOPED_OBSERVER_WITH_DUPLICATED_SOURCES_H_ |
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