Re: GCJ and C++ (calling Java from C++)

[Bryce McKinlay <mckinlay at redhat dot com>]

Lothar Werzinger wrote:

> in the generated headers from gcjh i get this:
>
>  class org::eclipse::emf::examples::extlibrary::Addressable
>  : public ::java::lang::Object
>  {
>    ...
>
>  class org::eclipse::emf::examples::extlibrary::Library
>  : public ::java::lang::Object
>  {
>    ...
>
>  class org::eclipse::emf::examples::extlibrary::impl::LibraryImpl
>  : public ::org::eclipse::emf::ecore::impl::EObjectImpl
>  {
>    ...
>  

C++ doesn't directly support the idea of a Java interface - we'd need to 
make some enhancements to the C++ front end in order to support this.

As a workaround, you can cast your object reference to the interface 
type (using a C++ static_cast, for example), and then call the interface 
method on that. Just be careful that the object you are casting really 
does implement the interface!

bug 15411 is a different issue, as in that case it can actually generate 
a broken virtual call because C++'s idea of the vtable layout will be 
different from reality. 15411 shouldn't effect you in this case because 
there is no abstract class here.

Bryce