/usr/share/doc/swig4.0-examples/Examples/test-suite/abstract_access.i

%module abstract_access

%warnfilter(SWIGWARN_LANG_DIRECTOR_ABSTRACT) A;

%inline %{
class A {
public:
  virtual ~A()
  {
  }

private:
        virtual int x() = 0;
protected:
        virtual int y() = 0;
public:
        virtual int z() = 0;
        int do_x() { return x(); }
};

class B : public A {
private:
        virtual int x() { return y(); }
};

class C : public B {
protected:
        virtual int y() { return z(); }
};

class D : public C {
private:
        virtual int z() { return 1; }
};

%}

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