ah yes, in chromium (and v8) we compile without RTTI, so we can't rely on dynamic_cast. But yes, you can store a AnyBase* in the internal field and then use a huge type switch to figure out the actual class.
Note that you still need a function that knows about all types you possible have in your system (the typeswitch).. On Fri, Feb 5, 2016 at 1:53 PM Zac Hansen <[email protected]> wrote: > I think I did find it in WrapperTypeInfo.h. And while I don't understand > exactly how it works, I'm guessing it requires each class that contains a > static WrapperTypeInfo to configure it in such a way that it can retrieve > information like what derived classes are and such? > > I'm trying to write something that can work with arbitrary classes.. my > current solution is to allow users to make an explicit list if which > classes can be substituted in when a certain type is wanted. It uses > sfinae to make sure the specified types are derived types. > > Basically wrap_class_for_js<MyClass>().add_compatible_types<MyClassChild, > MyClassGrandChild>(); > > so when you say "some_function(new MyClassChild())" in javascript, my > callback says "Is the GetInternalField of the v8::Object a MyClass? No? > Then let me try the compatible types. Is it a MyClassChild? Yes. Ok, > send the pointer in". If it makes it to the end of the compatible type > list without a match, it throws an exception (which is wrapped in a > isoalte->ThrowException() before control returns to V8). > > The thing I put int the InternalField v8::External is actually an > "AnyBase*" which is a base class of all Any<T> objects.. so I can use > dynamic_cast to do the testing of whether the type is a desired type or not. > > -- > -- > v8-users mailing list > [email protected] > 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 [email protected]. > For more options, visit https://groups.google.com/d/optout. > -- -- v8-users mailing list [email protected] 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 [email protected]. For more options, visit https://groups.google.com/d/optout.
