Interface inheritance problem in VS 2005 EE

I have an ice file like that:

module gaga
{
  interface ThingOne
  {
    string  ID();
  };
  

  interface ThingTwo
  {
    string  Name();
  };
};

I get a compile error stating that ThingTwoI is an abstract class if I do this:

class ThingOneI : public gaga::ThingOne
{
  public:
    virtual ::std::string ID(const ::Ice::Current& iceCurrent = ::Ice::Current());
};

class ThingTwoI : public virtual gaga::ThingTwo, public virtual ThingOneI
{
  public:
    virtual ::std::string Name(const ::Ice::Current& iceCurrent = ::Ice::Current());
};

If I add the following public member function to ThingTwoI, all works fine.

virtual ::std::string ID(const ::Ice::Current& iceCurrent = ::Ice::Current())
{
  return ThingOneI::ID(iceCurrent);
}

What am I doing wrong?

sorry, there was a typo in my code above, the ice file contains:

module gaga
{
  interface ThingOne
  {
    string  ID();
  };
  

  interface ThingTwo extends ThingOne
  {
    string  Name();
  };
};

Hi Peter,

Try changing the following:

class ThingOneI : public gaga::ThingOne

With:

class ThingOneI : virtual public gaga::ThingOne

If you don't specify virtual inheritance, you end up with 2 instances of gaga::ThingOne and as you discovered it doesn't work .

Cheers,
Benoit.

Bingo! Thanks heaps for that Benoit.