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Error - Going from Java to C++

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Join Date: Feb 2009

Posts: 19

Reputation: icu222much is an unknown quantity at this point

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icu222much icu222much is offline

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Error - Going from Java to C++

29 Days Ago

I have created a linked list in Java, and now I am trying to convert my program to C++.
When I try to compile, it gives me the error saying that 'next' uses 'CarNode' which is being defined. I am wondering if there is any way around this?

Java:

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public class CarNode {
  public Car carObject;
  public CarNode next;
 
  public CarNode (Car newCar, CarNode newNext) {
    carObject = newCar;
    next = newNext;
  }
}
public class CarNode {
  public Car carObject;
  public CarNode next;

  public CarNode (Car newCar, CarNode newNext) {
    carObject = newCar;
    next = newNext;
  }
}

C++:

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class CarNode: public Car {
  public:
    Car carObject;
    CarNode next;
 
    CarNode(Car newCar, CarNode newNext) {
      carObject = newCar;
      next = newNext;
  }
}
class CarNode: public Car {
  public:
    Car carObject;
    CarNode next;

    CarNode(Car newCar, CarNode newNext) {
      carObject = newCar;
      next = newNext;
  }
}

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Join Date: Dec 2008

Posts: 1,280

Reputation: firstPerson is just really nice

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firstPerson firstPerson is offline

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Nearly a Posting Virtuoso

29 Days Ago

I am a little doubtful about your code. Why does CarNode inherit from
Car and it also composes it ?

Note that in c++ objects is by default passed by value and Not passed by
reference. You may wan't to read about pointers and reference in c++.

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Join Date: Feb 2009

Posts: 19

Reputation: icu222much is an unknown quantity at this point

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icu222much icu222much is offline

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Newbie Poster

29 Days Ago

thank you.

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Join Date: Jan 2008

Posts: 3,828

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VernonDozier VernonDozier is offline

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Senior Poster

29 Days Ago

Yeah, I don't see the word "extends" in your Java code, so I'm doubtful of the inheritance. firstPerson is right regarding pointers and pass-by-value. I'd have to see the overall set-up, but you're probably looking for something ike:

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 C++ Syntax (Toggle Plain Text) 
class CarNode/*: public Car */
{
  public:
    Car* carObject;
    CarNode* next;
 
    CarNode(Car* newCar, CarNode* newNext) 
    {
      carObject = newCar;
      next = newNext;
  }
};
class CarNode/*: public Car */
{
  public:
    Car* carObject;
    CarNode* next;

    CarNode(Car* newCar, CarNode* newNext) 
    {
      carObject = newCar;
      next = newNext;
  }
};