C++ Object Access

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  18 years ago

  by Skar

  Skar

  Germany, Germany

  Joined 18 years ago

  Hello!
  

  
  I have a basic question about OO-Programming and C++:
  

  
  asume the following classes:
  

  
  class C_tyres {
  public:
  .... *)
  }
  

  
  class Ccar {
  public:
  int fuel;
  Ctyres tyres;
  }
  

  
  is there a possibility to access to Ccar-Object's "fuel" from within *) the Ctyres Object ?
  

  
  thanks in advance,
  Philipp
  

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  18 years ago

  by valkyr

  Carl Tawn

  Hull, England, United Kingdom

  Joined 18 years ago

  Basically no, at least not as far as I'm aware.
  

  
  valkyr

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  18 years ago

  by Skar

  Skar

  Germany, Germany

  Joined 18 years ago

  so the way to access the values is to put them in the methods like this:
  

  
  class C_tyres {
  ...
    void drive(int fuel) {
     ....
    }
  }
  

  
  ...
  C_tyres tyres;
  tyres.drive(fuel);
  ...
  

  
  ?

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  18 years ago

  by valkyr

  Carl Tawn

  Hull, England, United Kingdom

  Joined 18 years ago

  Yup, thats the way to do it. The CCar object should be able to call methods of the CTyres object, but not the other way around.
  

  
  valkyr

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  18 years ago

  by webjose

  Jose Pablo Ramirez Vargas

  Costa Rica, United States

  Joined 19 years ago

  I have a VERY basic knowledge of C++, so maybe what I'm going to say is useless, but here it goes:  Why don't you set a pointer to the parent class in the child class?  Then this pointer can be directed to point the parent by the child's constructor.

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  18 years ago

  by Skar

  Skar

  Germany, Germany

  Joined 18 years ago

  Yes, I tried it with pointers and in some cases it works, but there is a lot of to take care about, when using pointers. After all I found it doesn't seem to look like OO-Programming when using pointers here. But for my example with the car and the tyres an OO-strict programming would say: the tyres don't need to know anything about the fuel of the car If it needs to, I'll have to use another design of my Objects ... ?
  

  
  regards

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