Re: How to implement a java interface in c++?

[Andrew Haley <aph at redhat dot com>]

tsuraan writes:
 > > No. Just add the "native" keyword to your methods in the java class like
 > > this:
 > >
 > > ====CppImplementation.java========================
 > > public class CppImplementation implements JavaInterface
 > > {
 > >     public native void doIt():
 > > }
 > > =====================================
 > >
 > > Then you add a *.cpp file containing a normal C++ method implementation:
 > >
 > > #include "CppImplementation.h"
 > >
 > > void
 > > CppImplementation::doIt()
 > > {
 > >   // Do something
 > > }
 > >
 > >
 > > The needed header file can be generated with gcjh.
 > 
 > This really looks a lot like
 > $ cat CppImplementation.h
 > class CppImplementation : public JavaInterface
 > {
 >     public:
 >       void doIt():
 > }
 > 
 > Are there plans in the pipe for allowing this?

No.

 > It seems like a pre-processor run could go through and check if c++
 > classes are extending java ones, and do some parsing work to
 > re-phrase them to be java files.  Multiple inheritance wouldn't
 > work that way, but for simple things it seems like it could be
 > done.  Will it be?

I doubt it.  In any case, In any case there's a simple way that works:
write the headers in as .java files and the inplementation in C++.

Andrew.