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-## Nan::Callback
-
-`Nan::Callback` makes it easier to use `v8::Function` handles as callbacks. A class that wraps a `v8::Function` handle, protecting it from garbage collection and making it particularly useful for storage and use across asynchronous execution.
-
- - <a href="#api_nan_callback"><b><code>Nan::Callback</code></b></a>
-
-<a name="api_nan_callback"></a>
-### Nan::Callback
-
-```c++
-class Callback {
- public:
- Callback();
-
- explicit Callback(const v8::Local<v8::Function> &fn);
-
- ~Callback();
-
- bool operator==(const Callback &other) const;
-
- bool operator!=(const Callback &other) const;
-
- v8::Local<v8::Function> operator*() const;
-
- MaybeLocal<v8::Value> operator()(AsyncResource* async_resource,
- v8::Local<v8::Object> target,
- int argc = 0,
- v8::Local<v8::Value> argv[] = 0) const;
-
- MaybeLocal<v8::Value> operator()(AsyncResource* async_resource,
- int argc = 0,
- v8::Local<v8::Value> argv[] = 0) const;
-
- void SetFunction(const v8::Local<v8::Function> &fn);
-
- v8::Local<v8::Function> GetFunction() const;
-
- bool IsEmpty() const;
-
- void Reset(const v8::Local<v8::Function> &fn);
-
- void Reset();
-
- MaybeLocal<v8::Value> Call(v8::Local<v8::Object> target,
- int argc,
- v8::Local<v8::Value> argv[],
- AsyncResource* async_resource) const;
- MaybeLocal<v8::Value> Call(int argc,
- v8::Local<v8::Value> argv[],
- AsyncResource* async_resource) const;
-
- // Deprecated versions. Use the versions that accept an async_resource instead
- // as they run the callback in the correct async context as specified by the
- // resource. If you want to call a synchronous JS function (i.e. on a
- // non-empty JS stack), you can use Nan::Call instead.
- v8::Local<v8::Value> operator()(v8::Local<v8::Object> target,
- int argc = 0,
- v8::Local<v8::Value> argv[] = 0) const;
-
- v8::Local<v8::Value> operator()(int argc = 0,
- v8::Local<v8::Value> argv[] = 0) const;
- v8::Local<v8::Value> Call(v8::Local<v8::Object> target,
- int argc,
- v8::Local<v8::Value> argv[]) const;
-
- v8::Local<v8::Value> Call(int argc, v8::Local<v8::Value> argv[]) const;
-};
-```
-
-Example usage:
-
-```c++
-v8::Local<v8::Function> function;
-Nan::Callback callback(function);
-callback.Call(0, 0);
-```