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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 <memory> |
9 #include "platform/heap/Handle.h" | 9 #include "platform/heap/Handle.h" |
10 #include "platform/wtf/Allocator.h" | 10 #include "platform/wtf/Allocator.h" |
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39 if (other.data_) | 39 if (other.data_) |
40 data_ = WTF::WrapUnique(new Persistent<T>(other.data_->Get())); | 40 data_ = WTF::WrapUnique(new Persistent<T>(other.data_->Get())); |
41 | 41 |
42 // Invalidated, subsequent mutations will happen on a new copy. | 42 // Invalidated, subsequent mutations will happen on a new copy. |
43 // | 43 // |
44 // (Clearing |m_ownCopy| will not be observable over T, hence | 44 // (Clearing |m_ownCopy| will not be observable over T, hence |
45 // the const_cast<> is considered acceptable here.) | 45 // the const_cast<> is considered acceptable here.) |
46 const_cast<DataPersistent&>(other).own_copy_ = false; | 46 const_cast<DataPersistent&>(other).own_copy_ = false; |
47 } | 47 } |
48 | 48 |
| 49 DataPersistent(DataPersistent&& other) |
| 50 : data_(std::move(other.data_)), own_copy_(other.own_copy_) { |
| 51 other.own_copy_ = false; |
| 52 } |
| 53 |
49 const T* Get() const { return data_ ? data_->Get() : nullptr; } | 54 const T* Get() const { return data_ ? data_->Get() : nullptr; } |
50 | 55 |
51 const T& operator*() const { return data_ ? *Get() : nullptr; } | 56 const T& operator*() const { return data_ ? *Get() : nullptr; } |
52 const T* operator->() const { return Get(); } | 57 const T* operator->() const { return Get(); } |
53 | 58 |
54 T* Access() { | 59 T* Access() { |
55 if (data_ && !own_copy_) { | 60 if (data_ && !own_copy_) { |
56 *data_ = (*data_)->Copy(); | 61 *data_ = (*data_)->Copy(); |
57 own_copy_ = true; | 62 own_copy_ = true; |
58 } | 63 } |
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71 return data_->Get() == o.data_->Get() || *data_->Get() == *o.data_->Get(); | 76 return data_->Get() == o.data_->Get() || *data_->Get() == *o.data_->Get(); |
72 } | 77 } |
73 | 78 |
74 bool operator!=(const DataPersistent<T>& o) const { | 79 bool operator!=(const DataPersistent<T>& o) const { |
75 DCHECK(data_); | 80 DCHECK(data_); |
76 DCHECK(o.data_); | 81 DCHECK(o.data_); |
77 return data_->Get() != o.data_->Get() && *data_->Get() != *o.data_->Get(); | 82 return data_->Get() != o.data_->Get() && *data_->Get() != *o.data_->Get(); |
78 } | 83 } |
79 | 84 |
80 void operator=(std::nullptr_t) { data_.clear(); } | 85 void operator=(std::nullptr_t) { data_.clear(); } |
| 86 DataPersistent& operator=(DataPersistent&& other) { |
| 87 data_ = std::move(other.data_); |
| 88 own_copy_ = other.own_copy_; |
| 89 other.own_copy_ = false; |
| 90 return *this; |
| 91 } |
81 | 92 |
82 private: | 93 private: |
83 // Reduce size of DataPersistent<> by delaying creation of Persistent<>. | 94 // Reduce size of DataPersistent<> by delaying creation of Persistent<>. |
84 std::unique_ptr<Persistent<T>> data_; | 95 std::unique_ptr<Persistent<T>> data_; |
85 unsigned own_copy_ : 1; | 96 unsigned own_copy_ : 1; |
86 }; | 97 }; |
87 | 98 |
88 } // namespace blink | 99 } // namespace blink |
89 | 100 |
90 #endif // DataPersistent_h | 101 #endif // DataPersistent_h |
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