static in classes

This is a discussion on static in classes within the C++ Programming forums, part of the General Programming Boards category; hi all, i want to make a class which can count how many objects it has. i thougt to use ...

  1. #1
    Registered User
    Join Date
    May 2003
    Posts
    17

    static in classes

    hi all,
    i want to make a class which can count how many objects it has.
    i thougt to use static and one initilaize aftert that incrementing it.

    Code:
    class x
    {
    public:
    	int no;
    	int give_no;
    	x();
    };
    
    x::x()
    {
    	no=0;
    	give_no++;
    	no= give_no;
    }
    but it gives me error. where am i wrong?

  2. #2
    Registered User hk_mp5kpdw's Avatar
    Join Date
    Jan 2002
    Location
    Northern Virginia/Washington DC Metropolitan Area
    Posts
    3,803
    Code:
    class x
    {
    public:
        int no;
        static int give_no;
        x();
    };
    
    // You need to declare an instance of each static variable used in a particular class
    int x::give_no = 0;
    
    x::x()
    {
        no = ++give_no;
    }
    "Owners of dogs will have noticed that, if you provide them with food and water and shelter and affection, they will think you are god. Whereas owners of cats are compelled to realize that, if you provide them with food and water and shelter and affection, they draw the conclusion that they are gods."
    -Christopher Hitchens

  3. #3
    Registered User
    Join Date
    May 2003
    Posts
    17
    aff scope operator, thanks. i have a terrible headache.

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