I just tried splitting the line into two lines.
Local<Function> function;
> function = Handle<Function>::Cast(args[0]);
The error already occurs at Local<Function> function;. What am I doing
wrong? Other local handles can be created just fine. Changing Local to
Handle doesn't work either.
Am Mittwoch, 26. März 2014 09:18:11 UTC+1 schrieb danijar:
>
> In a C++ callback, one argument is a function and I want to get the
> Local<Function> handle of it. With an earlier version of V8, this worked.
>
> Local<Function> function = Local<Function>::Cast(args[0]->ToObject());
>
>
> Now, I tried to directly cast the argument like I've seen it in an
> example. This is my whole C++ callback.
>
> void callback(const FunctionCallbackInfo<Value> &args)
>> {
>> Isolate* isolate = args.GetIsolate();
>> HandleScope scope(isolate);
>> if (args.Length() < 1 || !args[0]->IsFunction()) {
>>
>> isolate->ThrowException(Exception::TypeError(String::NewFromUtf8(isolate,
>> "first argument must be a function")));
>> return;
>> }
>> Local<Function> function = Local<Function>::Cast(args[0]); // error
>> is at this line
>
> // ...
>
> }
>
>
> However, I get the following compile error.
>
> 1> v8/v8.h(5571): error C2248: 'v8::HandleScope::CreateHandle' : cannot
>> access protected member declared in class 'v8::HandleScope'
>> 1> v8/v8.h(837) : see declaration of 'v8::HandleScope::CreateHandle'
>> 1> v8/v8.h(817) : see declaration of 'v8::HandleScope'
>> 1> v8/v8.h(5566) : while compiling class template member function
>> 'v8::Handle<v8::Function> v8::Handle<v8::Function>::New(v8::Isolate *,T *)'
>> 1> with
>> 1> [
>> 1> T=v8::Function
>> 1> ]
>> 1> v8/v8.h(311) : see reference to function template instantiation
>> 'v8::Handle<v8::Function> v8::Handle<v8::Function>::New(v8::Isolate *,T *)'
>> being compiled
>> 1> with
>> 1> [
>> 1> T=v8::Function
>> 1> ]
>> 1> v8/v8.h(354) : see reference to class template instantiation
>> 'v8::Handle<v8::Function>' being compiled
>> 1> source.cpp(48) : see reference to class template instantiation
>> 'v8::Local<v8::Function>' being compiled
>
>
> How can I cast a callback argument to Local<Function>?
>
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