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class B {
  public:
    B() { seize(); }
    virtual ~B() { release(); }
  protected:
    virtual void seize() {}
    virtual void release() {}
};

class D : public B {
  public:
    D() {}
    ~D() {}
  protected:
    void seize() {
        B::seize();
        // get derived resources...
    }
    void release() {
        // release derived resources...
        B::release();
    }
};

D x;

class B {
  public:
    B() {
        // seize base resources...
    }
    virtual ~B() {
        // release base resources...
    }
};

class D : public B {
  public:
    D() {
        // seize derived resources...
    }
    ~D() {
        // release derived resources...
    }
};

D x;

class A {
  A() {
    // f();   // WRONG!
    A::f();   // okay
  }
  virtual void f();
};