Here's the code I use for this that seems to work (though suggestions
welcome):
template<class CALLBACK_FUNCTION>
void global_set_weak(v8::Isolate * isolate, const v8::Local<v8::Object> &
javascript_object, CALLBACK_FUNCTION function)
{
struct SetWeakCallbackData{
SetWeakCallbackData(CALLBACK_FUNCTION function, v8::Isolate * isolate,
const v8::Local<v8::Object> & javascript_object) :
function(function) {
this->global.Reset(isolate, javascript_object);
}
CALLBACK_FUNCTION function;
v8::Global<v8::Object> global;
};
auto callback_data = new SetWeakCallbackData(function, isolate,
javascript_object);
// set the callback on the javascript_object to be called when it's garbage
collected
callback_data->global.template SetWeak<SetWeakCallbackData>(callback_data,
[](const v8::WeakCallbackInfo<SetWeakCallbackData> & data) {
SetWeakCallbackData * callback_data = data.GetParameter();
callback_data->function();
callback_data->global.Reset();
delete callback_data;
}, v8::WeakCallbackType::kParameter);
}
On Sunday, October 2, 2016 at 12:58:35 AM UTC-7, Ben Noordhuis wrote:
>
> On Sun, Oct 2, 2016 at 1:54 AM, <[email protected] <javascript:>> wrote:
> > In this example, the Persistent is allocated on the stack. If I want the
> callback to keep working after the Persistent goes out of scope, would I
> have to allocate it on the heap? Would I then have to delete the Persistent
> in the callback?
>
> Yes to both questions.
>
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