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I have tried to implement properties in an "interface"
interface IPolygon 
  __declspec(property(get = _GetArea)) double area;

  // getters setters
  virtual double _GetArea() const abstract;
class  CPoly : public IPolygon
      CPoly(.....) { ......}
      // propertis getter/setter
      virtual double _GetArea()    const override { return .. calculation  of area ... }; 
.. somewhere in code:
CPoly mypolygon;
double xarea = mypolygon.area;
But when using the CPoly-class the linker! says that IPolygon::_GetArea() is not implemented yet. Then changing
interface IPolygon 
  __declspec(property(get = _GetArea)) double area;

  // getters setters
  virtual double _GetArea() const { return this->_GetArea(); }

calling the getter in the "interface" it will work
but this it not the way it should be ...

Is there a way to define abstract property getters and setters or abstract properties? to get the interface similar to c#.
(this is NOT a question wether it makes sense to use propertis in c++ anyhow!)

What I have tried:

Have tried the above codes and variants
Have debugged b step and when implemnting anything in the virtual fundction in IPolygon (instead of abstract),
the debugger steps into that function and not into the inherited class function (so IPolygon::_GetArea() is called instead of CPoly::_GetArea() )

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