Static Array in Abstract Class

Question

I have an abstract class on which I would like to include as a static variable an array of pointers for that same class. This array would be later used by the derived classes.

class Base {
  public:
    virtual int someValue() = 0;
    static Base* Bases[100];

    void Startup() {
      Bases[2] = this; // just a test
    };
};

class Derived : public Base {
  public:
    virtual int someValue() {return 10};
};

Yet, when compiling, I get the following error: Undefined symbols for architecture i386 "Bases", referenced from: Base::Startup().

How can I achieve this result?

Members declared static have to be defined outside the class. — Jesse Good
– Jesse Good, Commented May 22, 2012 at 22:40
You should consider using std::vector. It's a lot less work. — Qaz
– Qaz, Commented May 22, 2012 at 22:43

K-ballo · Accepted Answer · 2012-05-22 22:39:18Z

3

You have declared your array Bases, but you have not defined it. You need to define it somewhere else, preferably on a cpp file:

Base* Base::Bases[100];

answered May 22, 2012 at 22:39

K-ballo

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1 Comment

Jajajayja Over a year ago

That simple? Wow, I can't believe I took so long to figure it out. Thank you!

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