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1 // Copyright 2013 The Chromium Authors. All rights reserved. | 1 // Copyright 2014 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 CHROME_RENDERER_EXTENSIONS_UNSAFE_PERSISTENT_H_ | 5 #ifndef GIN_UNSAFE_PERSISTENT_H_ |
6 #define CHROME_RENDERER_EXTENSIONS_UNSAFE_PERSISTENT_H_ | 6 #define GIN_UNSAFE_PERSISTENT_H_ |
7 | 7 |
8 #include "v8/include/v8.h" | 8 #include "v8/include/v8.h" |
9 | 9 |
10 namespace extensions { | 10 namespace gin { |
11 | 11 |
12 // An unsafe way to pass Persistent handles around. Do not use unless you know | 12 // An unsafe way to pass Persistent handles around. Do not use unless you know |
13 // what you're doing. UnsafePersistent is only safe to use when we know that the | 13 // what you're doing. UnsafePersistent is only safe to use when we know that the |
14 // memory pointed by it is not going away: 1) When GC cannot happen while the | 14 // memory pointed by it is not going away: 1) When GC cannot happen while the |
15 // UnsafePersistent is alive or 2) when there is a strong Persistent keeping the | 15 // UnsafePersistent is alive or 2) when there is a strong Persistent keeping the |
16 // memory alive while the UnsafePersistent is alive. | 16 // memory alive while the UnsafePersistent is alive. |
17 template<typename T> class UnsafePersistent { | 17 template<typename T> class UnsafePersistent { |
18 public: | 18 public: |
19 UnsafePersistent() : value_(0) { } | 19 UnsafePersistent() : value_(0) { } |
20 | 20 |
21 explicit UnsafePersistent(v8::Persistent<T>* handle) { | 21 explicit UnsafePersistent(v8::Persistent<T>* handle) { |
22 value_ = handle->ClearAndLeak(); | 22 value_ = handle->ClearAndLeak(); |
23 } | 23 } |
24 | 24 |
25 UnsafePersistent(v8::Isolate* isolate, const v8::Handle<T>& handle) { | 25 UnsafePersistent(v8::Isolate* isolate, const v8::Handle<T>& handle) { |
26 v8::Persistent<T> persistent(isolate, handle); | 26 v8::Persistent<T> persistent(isolate, handle); |
27 value_ = persistent.ClearAndLeak(); | 27 value_ = persistent.ClearAndLeak(); |
28 } | 28 } |
29 | 29 |
30 UnsafePersistent(const UnsafePersistent& other) { | |
31 value_ = other.value_; | |
32 } | |
kouhei (in TOK)
2014/02/21 01:27:26
You also need to define operator= and destructor w
hajimehoshi
2014/02/21 11:07:23
Done. (Removed and used the default copy construct
| |
33 | |
34 T* Value() const { | |
35 return value_; | |
36 } | |
37 | |
38 T* operator ->() const { | |
39 return value_; | |
40 } | |
41 | |
30 // Usage of this function requires | 42 // Usage of this function requires |
31 // V8_ALLOW_ACCESS_TO_RAW_HANDLE_CONSTRUCTOR to be defined | 43 // V8_ALLOW_ACCESS_TO_RAW_HANDLE_CONSTRUCTOR to be defined |
32 void dispose() { | 44 void Dispose() { |
33 v8::Persistent<T> handle(value_); | 45 v8::Persistent<T> handle(value_); |
34 handle.Reset(); | 46 handle.Reset(); |
35 value_ = 0; | 47 value_ = 0; |
36 } | 48 } |
37 | 49 |
38 // Usage of this function requires | 50 // Usage of this function requires |
39 // V8_ALLOW_ACCESS_TO_RAW_HANDLE_CONSTRUCTOR to be defined | 51 // V8_ALLOW_ACCESS_TO_RAW_HANDLE_CONSTRUCTOR to be defined |
40 v8::Local<T> newLocal(v8::Isolate* isolate) { | 52 v8::Local<T> NewLocal(v8::Isolate* isolate) { |
41 return v8::Local<T>::New(isolate, v8::Local<T>(value_)); | 53 return v8::Local<T>::New(isolate, v8::Local<T>(value_)); |
42 } | 54 } |
43 | 55 |
44 private: | 56 private: |
45 T* value_; | 57 T* value_; |
46 }; | 58 }; |
47 | 59 |
48 } // namespace extensions | 60 } // namespace gin |
49 | 61 |
50 #endif // CHROME_RENDERER_EXTENSIONS_UNSAFE_PERSISTENT_H_ | 62 #endif // GIN_UNSAFE_PERSISTENT_H_ |
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