[boost] help

[柯猛]

Hi:   I  have a question, if my base class has a clone pure virtual function,what can I do to write the wrap class?      struct Base     {         virtual int f() = 0;         virtual Base* clone() = 0;     };       struct BaseWrap : Base     {         BaseWrap(PyObject* self_)             : self(self_) {}         int f() { return call_method<int>(self, "f"); }         Base* clone(){ return call_method<Base*>(self, "clone");}         PyObject* self;     };   If I write it like this,it report compile error.                                                                   kemeng