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| 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 |
| 3 // found in the LICENSE file. |
| 4 |
| 5 #ifndef GIN_HANDLE_H_ |
| 6 #define GIN_HANDLE_H_ |
| 7 |
| 8 #include "gin/converter.h" |
| 9 |
| 10 namespace gin { |
| 11 |
| 12 // You can use gin::Handle on the stack to retain a gin::Wrappable object. |
| 13 // Currently we don't have a mechanism for retaining a gin::Wrappable object |
| 14 // in the C++ heap because strong references from C++ to V8 can cause memory |
| 15 // leaks. |
| 16 template<typename T> |
| 17 class Handle { |
| 18 public: |
| 19 Handle() : object_(NULL) {} |
| 20 |
| 21 Handle(v8::Handle<v8::Value> wrapper, T* object) |
| 22 : wrapper_(wrapper), |
| 23 object_(object) { |
| 24 } |
| 25 |
| 26 bool IsEmpty() const { return !object_; } |
| 27 |
| 28 void Clear() { |
| 29 wrapper_.Clear(); |
| 30 object_ = NULL; |
| 31 } |
| 32 |
| 33 T* operator->() const { return object_; } |
| 34 v8::Handle<v8::Value> ToV8() { return wrapper_; } |
| 35 T* get() const { return object_; } |
| 36 |
| 37 private: |
| 38 v8::Handle<v8::Value> wrapper_; |
| 39 T* object_; |
| 40 }; |
| 41 |
| 42 template<typename T> |
| 43 struct Converter<gin::Handle<T> > { |
| 44 static v8::Handle<v8::Value> ToV8(v8::Isolate* isolate, |
| 45 const gin::Handle<T>& val) { |
| 46 return val.ToV8(); |
| 47 } |
| 48 static bool FromV8(v8::Isolate* isolate, v8::Handle<v8::Value> val, |
| 49 gin::Handle<T>* out) { |
| 50 T* object = NULL; |
| 51 Converter<T*>::FromV8(isolate, val, &object); |
| 52 return gin::Handle<T>(val, object); |
| 53 } |
| 54 }; |
| 55 |
| 56 // This function is a convenient way to create a handle from a raw pointer |
| 57 // without having to write out the type of the object explicitly. |
| 58 template<typename T> |
| 59 gin::Handle<T> CreateHandle(v8::Isolate* isolate, T* object) { |
| 60 return gin::Handle<T>(object->GetWrapper(isolate), object); |
| 61 } |
| 62 |
| 63 } // namespace gin |
| 64 |
| 65 #endif // GIN_HANDLE_H_ |
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