[omniORB] Validity test

[Hamilton Temple]

Hello all,

I have defined a complex type SeqSeqStr:

module MyModule{
  interface MyClass{
    typedef sequence<string> SeqStr;
    typedef sequence<SeqStr> SeqSeqStr;
   ...
  };
};

Inside the interface MyClass I defined the
function:

SeqSeqStr * list(const char * locator);

The implementation of list is as follows:

MyModule::MyClass::SeqSeqStr * MyClassImp::list(const char * query){
  MyModule::MyClass::SeqSeqStr_var res;

   ...

  return res._retn();
};

The invocation is

 MyModule::MyClass::SeqSeqStr_var listv;

  ...

 listv=manager->list(query_);

 I know that omniORB does not use
 null pointers to represent nil references.
 How could I check the validity of listv?
 Can be _is_nil(CORBA::Object *) applied
 in this case?

 Thank you,
 Hamilton
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