Re: [xmlvm-users] Extending the C++ backend

[Tom F. <ant...@gm...>]

Is the 'correct' solution to have every class extend java::lang::Object?  I
was trying to avoid that as the library is rather large and it would be nice
to not have to modify it but it's looking like that's the route I'm supposed
to take?

On Thu, Dec 31, 2009 at 7:27 PM, Tom Fairfield <ant...@gm...> wrote:

> I've begun work on extending the C++ backend to support a 3rd party library
> and a bit of the stl (with more to come hopefully).  I'm still wrapping my
> head around the xmlvm style of doing things and I've come to a bit of a
> roadblock.  The library I'm porting uses pointers to classes extensively.
> Right now I'm unable to use, for example, a function that returns a pointer
> to a class:
>
>   MyClass *mc =  getMyClass();
>
> Actually returning the class works fine but if I do it like this the
> generated code is an XMLVM::Object_Ptr<java::lang::Object> not a MyClass
> pointer.
>
> I've poked around the objc iPhone stuff to see if I could find out how to
> do this and I see things like this:
>
>    _op1.o = [((org_xmlvm_iphone_UIScreen*) _stack[_sp].o)
> applicationFrame];
>
> where _op1 is an XMLVMElem that's being treated as an id.  It seems like I
> could do something similar with pointers in C++ but I'm not sure where to go
> to implement this.  Hopefully I've made some sense - any push is the right
> direction is greatly appreciated.  Thanks,
>
> Tom
>