mirror of
https://github.com/idanoo/GoScrobble.git
synced 2024-11-25 09:55:15 +00:00
77 lines
2.6 KiB
Markdown
77 lines
2.6 KiB
Markdown
## 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);
|
|
```
|