ObjectWeakCallbackState(std::shared_ptr<v8::Persistent<v8::Value>> target) : target_(target) {

}

std::shared_ptr<v8::Persistent<v8::Value>> target_;

static void Init(v8::Isolate* isolate, v8::Local<v8::ObjectTemplate> globalTemplate);

static std::shared_ptr<v8::Persistent<v8::Value>> Register(v8::Local<v8::Context> context, const v8::Local<v8::Value> obj);

static void FinalizerCallback(const v8::WeakCallbackInfo<ObjectWeakCallbackState>& data);

static bool DisposeValue(v8::Isolate* isolate, v8::Local<v8::Value> value, bool isFinalDisposal = false);

static void ReleaseNativeCounterpartCallback(const v8::FunctionCallbackInfo<v8::Value>& info);

static long GetRetainCount(id obj);

static bool IsInstanceOf(id obj, Class clazz);