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

Thu Dec 1 00:49:00 GMT 2005

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