[omniORB] Interface inheritance or Code inheritance?

[Michael Mountrakis]

Hallo all

     I am quite new at omniORB and currently I use
omniORB_304_x86_linux_2.0_glibc2.
The problem I have is that I want one class to inherit methods from its
parent, without having to re write the method implementation for the derived
class. Is it possible with omniORB ? For that reason, I wrote the classic
idl:

test.idl
--------
    interface Base{
          double op1();
   };

    interface Derived : Base{
          double op2();
   };

I've compile it using the example code generation flag:
	$ omniidl  -bcxx -Wbexample  -Wbuse_quotes test.idl

The omniidl generated the following test_i.cc :

class Base_i: public POA_Base,
                public PortableServer::RefCountServantBase {
private:
  // Make sure all instances are built on the heap by making the
  // destructor non-public
  //virtual ~Base_i();
public:
  // standard constructor
  Base_i();
  virtual ~Base_i();

  // methods corresponding to defined IDL attributes and operations
  CORBA::Double op1();
};

//
// Example implementational code for IDL interface Base
//
Base_i::Base_i(){
  // add extra constructor code here
}
Base_i::~Base_i(){
  // add extra destructor code here
}
//   Methods corresponding to IDL attributes and operations
CORBA::Double Base_i::op1(){
  // MY CODE FOR op1() HERE
	return 1000;
}

// End of example implementational code

//
// Example class implementing IDL interface Derived
//
class Derived_i: public POA_Derived,
                public PortableServer::RefCountServantBase {
private:
  // Make sure all instances are built on the heap by making the
  // destructor non-public
  //virtual ~Derived_i();
public:
  // standard constructor
  Derived_i();
  virtual ~Derived_i();

  // methods corresponding to defined IDL attributes and operations
  CORBA::Double op2();
  CORBA::Double op1(); <------SHADOWS PARENT'S INHERITED METHOD

};

//
// Example implementational code for IDL interface Derived
//
Derived_i::Derived_i(){
  // add extra constructor code here
}
Derived_i::~Derived_i(){
  // add extra destructor code here
}
//   Methods corresponding to IDL attributes and operations
CORBA::Double Derived_i::op2(){
 // MY CODE HERE
	return 2000;
}

CORBA::Double Derived_i::op1(){
  // DO I HAVE TO REWRITE THE METHOD AGAIN ?
}

I also tryed out the following class Derived_i definition:

class Derived_i: public POA_Derived,public Base_i,
                public PortableServer::RefCountServantBase {
..............
};

But it did not compiled. Can you please suggest anything ?

Mike Mountrakis
Neurosoft Technologies
Athens Greece
www.neurosoft.gr
mike@neurosoft.gr