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76 lines
2.6 KiB
76 lines
2.6 KiB
## Nan::Callback |
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`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. |
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- <a href="#api_nan_callback"><b><code>Nan::Callback</code></b></a> |
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<a name="api_nan_callback"></a> |
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### Nan::Callback |
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```c++ |
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class Callback { |
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public: |
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Callback(); |
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explicit Callback(const v8::Local<v8::Function> &fn); |
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~Callback(); |
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bool operator==(const Callback &other) const; |
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bool operator!=(const Callback &other) const; |
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v8::Local<v8::Function> operator*() const; |
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MaybeLocal<v8::Value> operator()(AsyncResource* async_resource, |
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v8::Local<v8::Object> target, |
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int argc = 0, |
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v8::Local<v8::Value> argv[] = 0) const; |
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MaybeLocal<v8::Value> operator()(AsyncResource* async_resource, |
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int argc = 0, |
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v8::Local<v8::Value> argv[] = 0) const; |
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void SetFunction(const v8::Local<v8::Function> &fn); |
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v8::Local<v8::Function> GetFunction() const; |
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bool IsEmpty() const; |
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void Reset(const v8::Local<v8::Function> &fn); |
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void Reset(); |
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MaybeLocal<v8::Value> Call(v8::Local<v8::Object> target, |
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int argc, |
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v8::Local<v8::Value> argv[], |
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AsyncResource* async_resource) const; |
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MaybeLocal<v8::Value> Call(int argc, |
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v8::Local<v8::Value> argv[], |
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AsyncResource* async_resource) const; |
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// Deprecated versions. Use the versions that accept an async_resource instead |
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// as they run the callback in the correct async context as specified by the |
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// resource. If you want to call a synchronous JS function (i.e. on a |
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// non-empty JS stack), you can use Nan::Call instead. |
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v8::Local<v8::Value> operator()(v8::Local<v8::Object> target, |
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int argc = 0, |
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v8::Local<v8::Value> argv[] = 0) const; |
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v8::Local<v8::Value> operator()(int argc = 0, |
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v8::Local<v8::Value> argv[] = 0) const; |
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v8::Local<v8::Value> Call(v8::Local<v8::Object> target, |
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int argc, |
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v8::Local<v8::Value> argv[]) const; |
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v8::Local<v8::Value> Call(int argc, v8::Local<v8::Value> argv[]) const; |
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}; |
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``` |
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Example usage: |
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```c++ |
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v8::Local<v8::Function> function; |
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Nan::Callback callback(function); |
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callback.Call(0, 0); |
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```
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