72 lines
1.9 KiB
C++
72 lines
1.9 KiB
C++
// Copyright 2013 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE.chromium file.
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#ifndef NATIVE_MATE_HANDLE_H_
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#define NATIVE_MATE_HANDLE_H_
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#include "native_mate/converter.h"
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namespace mate {
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// You can use mate::Handle on the stack to retain a mate::Wrappable object.
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// Currently we don't have a mechanism for retaining a mate::Wrappable object
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// in the C++ heap because strong references from C++ to V8 can cause memory
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// leaks.
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template<typename T>
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class Handle {
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public:
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Handle() : object_(NULL) {}
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Handle(v8::Local<v8::Object> wrapper, T* object)
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: wrapper_(wrapper),
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object_(object) {
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}
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bool IsEmpty() const { return !object_; }
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void Clear() {
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wrapper_.Clear();
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object_ = NULL;
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}
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T* operator->() const { return object_; }
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v8::Local<v8::Object> ToV8() const { return wrapper_; }
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T* get() const { return object_; }
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private:
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v8::Local<v8::Object> wrapper_;
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T* object_;
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};
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template<typename T>
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struct Converter<mate::Handle<T> > {
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static v8::Local<v8::Value> ToV8(v8::Isolate* isolate,
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const mate::Handle<T>& val) {
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return val.ToV8();
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}
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static bool FromV8(v8::Isolate* isolate, v8::Local<v8::Value> val,
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mate::Handle<T>* out) {
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T* object = NULL;
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if (val->IsNull() || val->IsUndefined()) {
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*out = mate::Handle<T>();
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return true;
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}
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if (!Converter<T*>::FromV8(isolate, val, &object)) {
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return false;
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}
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*out = mate::Handle<T>(val->ToObject(), object);
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return true;
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}
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};
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// This function is a convenient way to create a handle from a raw pointer
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// without having to write out the type of the object explicitly.
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template<typename T>
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mate::Handle<T> CreateHandle(v8::Isolate* isolate, T* object) {
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return mate::Handle<T>(object->GetWrapper(), object);
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}
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} // namespace mate
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#endif // NATIVE_MATE_HANDLE_H_
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