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| 1 // Copyright 2016 The Chromium Authors. All rights reserved. | 1 // Copyright 2016 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 DataPersistent_h | 5 #ifndef DataPersistent_h |
| 6 #define DataPersistent_h | 6 #define DataPersistent_h |
| 7 | 7 |
| 8 #include <memory> |
| 8 #include "platform/heap/Handle.h" | 9 #include "platform/heap/Handle.h" |
| 9 #include "wtf/Allocator.h" | 10 #include "wtf/Allocator.h" |
| 10 #include "wtf/PtrUtil.h" | 11 #include "wtf/PtrUtil.h" |
| 11 #include <memory> | |
| 12 | 12 |
| 13 namespace blink { | 13 namespace blink { |
| 14 | 14 |
| 15 // DataPersistent<T> provides the copy-on-modify behavior of DataRef<>, | 15 // DataPersistent<T> provides the copy-on-modify behavior of DataRef<>, |
| 16 // but for Persistent<> heap references. | 16 // but for Persistent<> heap references. |
| 17 // | 17 // |
| 18 // That is, the DataPersistent<T> copy assignment, |a = b;|, makes |a| | 18 // That is, the DataPersistent<T> copy assignment, |a = b;|, makes |a| |
| 19 // share a reference to the T object that |b| holds until |a| is mutated | 19 // share a reference to the T object that |b| holds until |a| is mutated |
| 20 // and access() on it is called. Or, dually, if |b| is mutated after the | 20 // and access() on it is called. Or, dually, if |b| is mutated after the |
| 21 // assignment that mutation isn't observable to |a| but will be performed | 21 // assignment that mutation isn't observable to |a| but will be performed |
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| 79 | 79 |
| 80 private: | 80 private: |
| 81 // Reduce size of DataPersistent<> by delaying creation of Persistent<>. | 81 // Reduce size of DataPersistent<> by delaying creation of Persistent<>. |
| 82 std::unique_ptr<Persistent<T>> m_data; | 82 std::unique_ptr<Persistent<T>> m_data; |
| 83 unsigned m_ownCopy : 1; | 83 unsigned m_ownCopy : 1; |
| 84 }; | 84 }; |
| 85 | 85 |
| 86 } // namespace blink | 86 } // namespace blink |
| 87 | 87 |
| 88 #endif // DataPersistent_h | 88 #endif // DataPersistent_h |
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