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. >>> >> -- -- v8-users mailing list v8-users@googlegroups.com http://groups.google.com/group/v8-users --- You received this message because you are subscribed to the Google Groups "v8-users" group. To unsubscribe from this group and stop receiving emails from it, send an email to v8-users+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/v8-users/3496e4c4-cf66-42ae-b517-86ac95431901n%40googlegroups.com.