Rodrigo, you should be able to trivially cast a v8::Function or v8::Object
to v8::Value is that what you're trying to do? In that case you don't need
to put them in a v8::External. You can pass those objects to
data->SetInternalField safely I would think.
Ben
On Tuesday, 20 October 2020 at 15:10:00 UTC+10:30 Rodrigo Hernandez wrote:
> So, coming back to this, is there a way to cast/convert/wrap a local
> template (function or object) into a v8::Value?
> I am thinking about hiding them inside an internal field so I could do:
>
> context->global()->GetFunction("constructor")->GetInternalField(X).
>
> how safe would it be to cast them to a void* and wrapping them inside a
> v8::External?
>
> On Sunday, October 11, 2020 at 11:40:27 AM UTC-6 Rodrigo Hernandez wrote:
>
>> Thanks Ben, I see how those are less optimal, I was hoping for something
>> along the lines of context->global()->GetFunctionTemplate("constructor"),
>> or something along those lines.
>> The only problem I have with my approach is that I need a Finalize
>> function on each wrapped class that pretty much just resets the permanent
>> handles.
>>
>> Thanks Again!
>> On Sunday, October 11, 2020 at 1:49:10 AM UTC-6 Ben Noordhuis wrote:
>>
>>> On Sat, Oct 10, 2020 at 10:44 PM Rodrigo Hernandez
>>> <kwizatz.ae...@gmail.com> wrote:
>>> >
>>> > Hello,
>>> >
>>> > So, suppose I am wrapping a C++ class around a JS constructor, I've
>>> already created and initialized the isolate, created and initialized a
>>> context, I have the FunctionTemplate for the constructor and I have
>>> instantiated the function and I can call it from Js as x() or new X(),
>>> > all this is fine, the function template context is finished and the
>>> handle lost.
>>> >
>>> > But then I want to create another wrapped object for a class that
>>> inherits from the first one.
>>> > Is there a way to retrieve the base class FunctionTemplate so in the
>>> child class I can call child->Inherit(base)?
>>> >
>>> > Is there another way of doing this?
>>> >
>>> > Right now I am keeping a C++ unordered_map of isolate to persistent
>>> handle to function templates, and that works, but is that the only option?
>>> >
>>> > Thanks!
>>>
>>> It's not the only option but it's a pretty good solution. Less optimal
>>> solutions:
>>>
>>> - store them in the snapshot with SnapshotCreator::AddData() (but you
>>> can only retrieve it once)
>>> - scan the heap for them with Isolate::VisitHandlesWithClassIds().
>>>
>>> No doubt there are more ways to stow them away somewhere.
>>>
>>
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