Member Function Pointer...

This is a discussion on Member Function Pointer... within the C++ Programming forums, part of the General Programming Boards category; Well, this is starting to annoy me and now it is preventing my project from continuing on. I want to ...

  1. #1
    Not stupid, just stupider yaya's Avatar
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    Thumbs up Member Function Pointer...

    Well, this is starting to annoy me and now it is preventing my project from continuing on. I want to have member function pointers that can still access the members of the class. For example:

    Code:
    class FOO
    {
    private:
    	int a;
    
    public:
    	void TEST() { return a; }; // how do I get a pointer to this?
    };
    I know this isn't possible (without the function being static), but what other alternatives are there (not including global variables, if possible)?

    Thanks.

  2. #2
    3735928559
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    Code:
    class FOO
    {
    private:
    	int a;
    
    public:
    	int TEST() { return a; }; // how do I get a pointer to this?
    };
    
    
    
    int _tmain(int argc, _TCHAR* argv[])
    {
      FOO afoo;
      int (FOO::*fp)()= &FOO::TEST;
    
      (afoo.*fp)();
    
      return 0;
    }
    Last edited by m37h0d; 11-06-2009 at 06:40 AM.

  3. #3
    Registered User
    Join Date
    Jun 2005
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    Unlike a normal pointer, which points at an absolute address, a "pointer to member" is relative to some object. A "pointer to member" carries no information about the object it will act on.

    On its own, therefore, a pointer to member is unusable. The second bit of information needed is the object it is relative to. Hence the need for "(anObject.*a_member_pointer)()" method of use.
    Right 98% of the time, and don't care about the other 3%.

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