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1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2012 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 // Immutable<T> provides an easy, cheap, and thread-safe way to pass | 5 // Immutable<T> provides an easy, cheap, and thread-safe way to pass |
6 // large immutable data around. | 6 // large immutable data around. |
7 // | 7 // |
8 // For example, consider the following code: | 8 // For example, consider the following code: |
9 // | 9 // |
10 // typedef std::vector<LargeObject> LargeObjectList; | 10 // typedef std::vector<LargeObject> LargeObjectList; |
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57 // used by providing your own traits class or using one of the | 57 // used by providing your own traits class or using one of the |
58 // pre-defined ones below. See comments on traits below for details. | 58 // pre-defined ones below. See comments on traits below for details. |
59 // | 59 // |
60 // NOTE: Some complexity is necessary in order to use Immutable<T> | 60 // NOTE: Some complexity is necessary in order to use Immutable<T> |
61 // with forward-declared types. See comments on traits below for | 61 // with forward-declared types. See comments on traits below for |
62 // details. | 62 // details. |
63 | 63 |
64 #ifndef COMPONENTS_SYNC_BASE_IMMUTABLE_H_ | 64 #ifndef COMPONENTS_SYNC_BASE_IMMUTABLE_H_ |
65 #define COMPONENTS_SYNC_BASE_IMMUTABLE_H_ | 65 #define COMPONENTS_SYNC_BASE_IMMUTABLE_H_ |
66 | 66 |
67 // For std::swap(). | 67 #include <utility> |
68 #include <algorithm> | |
69 | 68 |
70 #include "base/macros.h" | 69 #include "base/macros.h" |
71 #include "base/memory/ref_counted.h" | 70 #include "base/memory/ref_counted.h" |
72 | 71 |
73 namespace syncer { | 72 namespace syncer { |
74 | 73 |
75 namespace internal { | 74 namespace internal { |
76 // This class is part of the Immutable implementation. DO NOT USE | 75 // This class is part of the Immutable implementation. DO NOT USE |
77 // THIS CLASS DIRECTLY YOURSELF. | 76 // THIS CLASS DIRECTLY YOURSELF. |
78 | 77 |
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239 | 238 |
240 // Helper function to avoid having to write out template arguments. | 239 // Helper function to avoid having to write out template arguments. |
241 template <typename T> | 240 template <typename T> |
242 Immutable<T> MakeImmutable(T* t) { | 241 Immutable<T> MakeImmutable(T* t) { |
243 return Immutable<T>(t); | 242 return Immutable<T>(t); |
244 } | 243 } |
245 | 244 |
246 } // namespace syncer | 245 } // namespace syncer |
247 | 246 |
248 #endif // COMPONENTS_SYNC_BASE_IMMUTABLE_H_ | 247 #endif // COMPONENTS_SYNC_BASE_IMMUTABLE_H_ |
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