CODEWITHSUNDEEP
c++inheritance
cydonian
cydonian

Reputation: 1816

Override virtual function with existing function

Let me first say this is a purely academic question, since what I want to do can be better accomplished with multiple layers of inheritance.

That said, I wonder if it's possible to override a virtual function with an existing function without writing a wrapper or adding any inheritance layers. Code:

int myfunc2() { return 2; }

class Parent {
 public:
  virtual int myfunc() { return 0; }
};

class Child1 : public Parent {
 public:
  int myfunc() override { return 1; }
};

class Child2 : public Parent {
 public:
  // There a way to do this?
  // int myfunc() = myfunc2;
  // instead of this?
  int myfunc() { return myfunc2(); };
};

int main() {
  Child2 baz;
  return baz.myfunc();
}

I'd like to override myfunc in the definition of Child2 by simply "forwarding" the declaration to the existing declaration of myfunc2.

Is this, or something akin to it, possible?

Context: I've got a bunch of child classes, some of which have identical definitions of myfunc, some of which do not. A better solution is to create an intermediate child class that defines the common myfunc and have the pertinent children inherit from that instead.

Upvotes: 0

Views: 90

Answers (2)

Vlad from Moscow
Vlad from Moscow

Reputation: 311088

There is a problem.

A non-static member function accepts one more implicit parameter: pointer to the object itself. While a stand-alone function does not have such a parameter, For example you may not use the keyword this or member access syntax inside the definition of a stand alone function.

Upvotes: 0

R Sahu
R Sahu

Reputation: 206717

// There a way to do this?
// int myfunc() = myfunc2;
// instead of this?
int myfunc() { return myfunc2(); };

No, there isn't.

Upvotes: 5

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