Thanks :) Yeah, I create that function that knows about the types in my system at compile time from types provided by the user, so it ends up pretty flexible.
--Zac On Mon, Feb 15, 2016 at 2:04 AM, Jochen Eisinger <[email protected]> wrote: > 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 a topic in the > Google Groups "v8-users" group. > To unsubscribe from this topic, visit > https://groups.google.com/d/topic/v8-users/rr4CkYpoZBY/unsubscribe. > To unsubscribe from this group and all its topics, 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.
