[omniORB] Interface inheritance or Code inheritance?

[Lars von Wedel]

Try to use virtual inheritance, it should work out then.

Lars


Michael Mountrakis wrote:
> 
> 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
> 
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